Gas sensor system, gas sensor calibration method, and gas sensor calibration program

Abstract

To provide a gas sensor system, a gas sensor calibration method, and a gas sensor calibration program.SOLUTION: In a gas sensor system, a first gas sensor device includes a transmission section that transmits first calibration information for calibrating gas concentration of a measuring object calculated on the basis of, output of the first gas sensor, and in the first gas sensor device, the transmission section transmits the first calibration information and reliability information indicating calibration reliability of the first gas sensor device, and a second gas sensor device includes a reception section that receives the first calibration information and the reliability information transmitted by the transmission section and a calibration section that calibrates the gas concentration of the measuring object calculated on the basis of, output of the second gas sensor on the basis of the first calibration information received by the reception section, and the calibration section calibrates the gas concentration of the measuring object calculated on the basis of, the output of the second gas sensor on the basis of the received first calibration information when the calibration reliability of the first gas sensor device received by the reception section is higher than reference calibration reliability.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a gas sensor system, a gas sensor calibration method, and a gas sensor calibration program. [Background technology]

[0002] Patent Document 1 states that "an accurate carbon dioxide concentration measuring system is provided" (abstract). [Prior art document] [Patent documents] [Patent Document 1] JP 2014-228518 A Summary of the Invention

[0003] In a first aspect of the present invention, there is provided a gas sensor system. The gas sensor system includes a first gas sensor device having a transmitter that transmits first calibration information for calibrating a gas concentration of a measurement target calculated based on an output of a first gas sensor, the transmitter transmitting the first calibration information and reliability information indicating a calibration reliability of the first gas sensor device, a receiver that receives the first calibration information and the reliability information transmitted by the transmitter, and a calibration unit that calibrates a gas concentration of a measurement target calculated based on an output of a second gas sensor based on the first calibration information received by the receiver. When the calibration reliability of the first gas sensor device received by the receiver is higher than a reference calibration reliability, the calibration unit calibrates the gas concentration of a measurement target calculated based on an output of the second gas sensor based on the received first calibration information.

[0004] The second gas sensor device may further include a storage unit that stores reference reliability information indicating the reference calibration reliability. When the calibration reliability of the first gas sensor device received by the receiving unit is higher than the reference calibration reliability, the storage unit may update the reference calibration reliability based on the calibration reliability of the first gas sensor device received by the receiving unit.

[0005] The measurement target whose gas concentration is calculated based on the output of the first gas sensor and the measurement target whose gas concentration is calculated based on the output of the second gas sensor may be the same.

[0006] The first gas sensor device may include a first gas sensor. The first gas sensor device may be a mobile terminal.

[0007] The second gas sensor device may be disposed in an internal space of a measurement target whose gas concentration is calculated based on the output of the second gas sensor.

[0008] The second gas sensor device may include a second gas sensor. The second gas sensor device may be a mobile terminal.

[0009] When the reliability of self-calibration of the second gas sensor device is equal to or lower than a predetermined second threshold and the calibration reliability of the first gas sensor device exceeds the first threshold, the calibration unit may calibrate the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the received first calibration information.

[0010] The second gas sensor device may further include a position information acquisition unit that acquires position information of the second gas sensor device. The reliability information may include position information of the first gas sensor device. The calibration unit may calibrate the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the received first calibration information in accordance with the distance between the position of the first gas sensor device and the position of the second gas sensor device acquired by the position information acquisition unit.

[0011] The gas sensor system may include a plurality of first gas sensor devices. The receiving unit may receive first calibration information and reliability information for each of the plurality of first gas sensor devices. The calibration unit may weight the calibration reliability of each of the plurality of first gas sensor devices, and calibrate the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the weighted calibration reliability.

[0012] The calibration section may calibrate the concentration of the gas to be measured, which is calculated based on the output of the second gas sensor, based on the highest calibration reliability among the respective calibration reliability of the plurality of first gas sensor devices.

[0013] In a second aspect of the present invention, there is provided a gas sensor calibration method. The gas sensor calibration method includes a transmitting step in which a transmitting unit transmits first calibration information and reliability information, where the first calibration information is calibration information for calibrating a gas concentration of a measurement target calculated based on an output of a first gas sensor, and the reliability information is reliability information indicating a calibration reliability of the first gas sensor device, a receiving step in which a receiving unit receives the first calibration information and the reliability information transmitted in the transmitting step, and a calibration step in which the calibration unit calibrates a gas concentration of a measurement target calculated based on an output of a second gas sensor based on the first calibration information received in the receiving step. The calibration step is a step in which, when the calibration reliability of the first gas sensor device received in the receiving step is higher than a reference calibration reliability, the calibration unit calibrates the gas concentration of a measurement target calculated based on the output of the second gas sensor based on the received first calibration information.

[0014] The gas sensor calibration method may further include a storage step of storing the reliability information received in the receiving step by the storage unit. The storage step may include an update step of updating the reference calibration reliability based on the calibration reliability of the first gas sensor device received in the receiving step when the calibration reliability of the first gas sensor device received in the receiving step is higher than the reference calibration reliability.

[0015] The measurement target whose gas concentration is calculated based on the output of the first gas sensor and the measurement target whose gas concentration is calculated based on the output of the second gas sensor may be the same.

[0016] The second gas sensor may be provided in a second gas sensor device. The second gas sensor device may be disposed in an internal space of a measurement target whose gas concentration is calculated based on an output of the second gas sensor.

[0017] The second gas sensor may be provided in the second gas sensor device. The calibration step may be a step of calibrating the gas concentration of the measurement target calculated based on the output of the second gas sensor, based on the first calibration information received in the receiving step, by a calibration unit when the reliability of self-calibration of the second gas sensor device is equal to or lower than a predetermined second threshold value and the calibration reliability of the first gas sensor device exceeds the first threshold value.

[0018] The second gas sensor may be provided in the second gas sensor device. The gas sensor calibration method may further include a position information acquisition step in which a position information acquisition unit acquires position information of the second gas sensor device. The reliability information may include position information of the first gas sensor device. The calibration step may be a step in which the calibration unit calibrates the gas concentration of the measurement target, which is calculated based on the output of the second gas sensor, based on the received first calibration information in accordance with the distance between the position of the first gas sensor device and the position of the second gas sensor device acquired in the position information acquisition step.

[0019] The receiving step may be a step of the receiving unit receiving the first calibration information and the reliability information of each of the first gas sensor devices. The calibrating step may be a step of the calibrating unit weighting the calibration reliability of each of the first gas sensor devices and calibrating the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the weighted calibration reliability.

[0020] The calibration step may be a step in which the calibration section calibrates the gas concentration of the measurement target, which is calculated based on the output of the second gas sensor, based on the highest calibration reliability among the respective calibration reliability of the plurality of first gas sensor devices.

[0021] In a third aspect of the present invention, there is provided a gas sensor calibration program for causing a computer to execute a gas sensor calibration method.

[0022] The above summary of the invention does not list all of the features of the present invention. Also, subcombinations of these features may also be inventions. [Brief description of the drawings]

[0023] [Figure 1] 1 is a diagram showing an example of calibration of gas concentrations in the first gas sensor device 100 and the second gas sensor device 200 according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a block diagram showing an example of a gas sensor system 400 according to an embodiment of the present invention. [Diagram 3] FIG. 4 is a block diagram showing another example of the gas sensor system 400 according to an embodiment of the present invention. [Figure 4] FIG. 4 is a block diagram showing another example of the gas sensor system 400 according to an embodiment of the present invention. [Diagram 5] FIG. 4 is a block diagram showing another example of the gas sensor system 400 according to an embodiment of the present invention. [Figure 6] FIG. 2 is a diagram showing an example of calibration of gas concentrations in the first gas sensor device 100, the second gas sensor device 200, and the third gas sensor device 300 according to an embodiment of the present invention. [Figure 7] FIG. 2 is a diagram showing an example of calibration of gas concentrations in the gas sensor device 150 and the gas sensor device 250 according to an embodiment of the present invention. [Figure 8] FIG. 1 is a block diagram showing an example of a gas sensor device 150 and a gas sensor device 250 according to an embodiment of the present invention. [Figure 9] FIG. 2 is a block diagram showing another example of the gas sensor device 150 and the gas sensor device 250 according to an embodiment of the present invention. [Figure 10] 2 is a flowchart illustrating an example of a gas sensor calibration method according to an embodiment of the present invention. [Figure 11] 11 shows an example of details of the calibration step S104 in FIG. [Figure 12]6 is a flowchart showing another example of a gas sensor calibration method according to an embodiment of the present invention. [Figure 13] 2 is a flowchart illustrating an example of a gas sensor calibration method according to an embodiment of the present invention. [Figure 14] 2 is a flowchart illustrating an example of a gas sensor calibration method according to an embodiment of the present invention. [Figure 15] 15 shows an example of details of the calibration step S304 in FIG. 14. [Figure 16] 6 is a flowchart showing another example of a gas sensor calibration method according to an embodiment of the present invention. [Figure 17] FIG. 2 illustrates an example of a computer 2200 in which the gas sensor system 400, gas sensor device 150 or gas sensor device 250 may be implemented in whole or in part according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] The present invention will be described below through embodiments of the invention, but the following embodiments do not limit the scope of the invention according to the claims. Furthermore, not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0025] 1 is a diagram showing an example of calibration of gas concentrations in a first gas sensor device 100 and a second gas sensor device 200 according to an embodiment of the present invention. In this example, a measurement target 501 is outdoors, and a measurement target 502 is indoors.

[0026] In this example, a living body 90 has a first gas sensor device 100. The first gas sensor device 100 may be a mobile terminal. The living body 90 is, for example, a human being. Fig. 1 shows a situation in which the living body 90 having the first gas sensor device 100 moves from a measurement target 501 to a measurement target 502.

[0027] A gas 503 is present in the measurement target 501. The gas 503 may be CO2 (carbon dioxide) gas, CH4 (methane) gas, or alcohol. A gas sensor 600 that measures the concentration of the gas 503 in the measurement target 501 may be disposed in the measurement target 501. When the measurement target 501 is outdoors, the gas sensor 600 measures the concentration of the gas 503 in the air outdoors. The gas sensor 600 is, for example, an optical element. The gas sensor 600 may be a gas sensor using a non-dispersive infrared absorption method (NDIR (Non Dispersive InfraRed)), a gas sensor using photoacoustic spectroscopy, a gas sensor that detects gas using a solid electrolyte, or a MEMS (Micro Electro Mechanical Systems) gas sensor. The method of detecting gas by the gas sensor 600 is not particularly limited.

[0028] Gas 504 exists in internal space 508 of measurement target 502. Gas 504 may be CO2 (carbon dioxide) gas, CH4 (methane) gas, or alcohol. Internal space 508 may be a space isolated from measurement target 501. Internal space 508 may be a closed space. Internal space 508 is, for example, a room.

[0029] The second gas sensor device 200 is disposed in the measurement target 502. In this example, the second gas sensor device 200 is disposed in the internal space 508. The second gas sensor device 200 may be a mobile terminal.

[0030] The characteristics of the gas sensor 600 may change over time. In the case where the gas sensor 600 is an optical element and a CO2 (carbon dioxide) sensor that measures gas concentration using infrared light, the characteristics of the gas sensor 600 refer to the characteristics of the optical element, etc. The characteristics of the optical element, etc. may change over time. For this reason, it is preferable that the gas sensor 600 is calibrated. It is preferable that the gas sensor 600 is calibrated periodically.

[0031] The gas sensor 600 may be self-calibrated or may be calibrated by another gas sensor 600. Self-calibration refers to calibrating the gas sensor 600 itself based on the gas concentration value calculated by the gas sensor 600. For example, a constant gas concentration value in a predetermined period, or a maximum or minimum value of the gas concentration in a predetermined period, etc. may be used to calibrate the gas sensor 600 itself. For example, when the gas sensor 600 is a CO2 (carbon dioxide) sensor, the output of the gas sensor 600 may be self-calibrated by an ABC (Automatic Baseline Correction or Automatic Background Calibration) algorithm.

[0032] When the measurement target 501 is outdoors and the gas sensor 600 is a CO2 (carbon dioxide) sensor, the output of the gas sensor 600 may be calibrated at a timing when the CO2 (carbon dioxide) concentration in the air is highly likely to reach a reference value of the CO2 (carbon dioxide) concentration (e.g., 400 ppm). The output of the gas sensor 600 may be calibrated so that the CO2 (carbon dioxide) concentration calculated based on the output of the gas sensor 600 indicates the reference value at that timing. The timing is, for example, a time period (e.g., midnight) when the activity of the living body 90 is likely to be suppressed.

[0033] The gas sensor 600 may transmit calibration information related to the calibration of the gas sensor 600. The calibration information is referred to as calibration information Ic. The calibration information Ic is calibration information for calibrating the concentration of the gas 503 in the measurement target 501, which is calculated based on the output of the gas sensor 600. The calibration information Ic is information related to calibration for bringing the concentration of the gas 503 closer to the true value of the concentration. When the gas sensor 600 is a CO2 (carbon dioxide) sensor, the calibration information Ic may be calibration information for calibrating the CO2 (carbon dioxide) concentration, calculated based on the output of the gas sensor 600, so that the CO2 (carbon dioxide) concentration indicates the reference value (e.g., 400 ppm) at a timing when the true value of the CO2 (carbon dioxide) concentration is highly likely to be the reference value. The gas sensor 600 may wirelessly transmit the calibration information Ic to an open space in the measurement target 501.

[0034] 2 is a block diagram showing an example of a gas sensor system 400 according to an embodiment of the present invention. The gas sensor system 400 includes a first gas sensor device 100 and a second gas sensor device 200. The first gas sensor device 100 includes a transmitting unit 13. The first gas sensor device 100 may include a receiving unit 10, a control unit 15, a calibration unit 14, a display unit 12, and an AD conversion unit 114.

[0035] The control unit 15 is, for example, a CPU (Central Processing Unit). The first gas sensor device 100 may be a mobile terminal equipped with the CPU. The mobile terminal may include a portable computer such as a smartphone or a tablet. The first gas sensor device 100 may be a mobile terminal equipped with the CPU, a memory, an interface, and the like.

[0036] The display unit 12 is, for example, a display, a monitor, etc. When the first gas sensor device 100 is a mobile terminal, the display unit 12 may be a display of the mobile terminal.

[0037] The first gas sensor device 100 may include a first gas sensor 11. When the first gas sensor device 100 is disposed in a measurement target 501, the first gas sensor 11 measures the concentration of a gas 503 in the measurement target 501. The first gas sensor 11 may be a CO2 (carbon dioxide) sensor, a CH4 (methane) sensor, or an alcohol sensor. The first gas sensor 11 may measure the same type of gas 503 (see FIG. 1) as the gas sensor 600 (see FIG. 1). That is, when the gas sensor 600 is a CO2 (carbon dioxide) sensor, the first gas sensor 11 may be a CO2 (carbon dioxide) sensor.

[0038] The characteristics of the first gas sensor 11 may change over time. For this reason, it is preferable that the first gas sensor 11 is calibrated. In this example, the receiving unit 10 receives the calibration information Ic transmitted by the gas sensor 600. In this example, the calibration unit 14 calibrates the concentration of the gas 503 (see FIG. 1) in the measurement target 501 (see FIG. 1), which is calculated based on the output of the first gas sensor 11, based on the calibration information Ic. This makes it easier for the measurement value of the concentration of the gas 503 by the first gas sensor 11 to be more accurate than before the calibration. The calibration unit 14 may calibrate the concentration of the gas 503 (see FIG. 1) in a state where the first gas sensor device 100 is placed in the measurement target 501 (in this example, a state where the living body 90 is present outdoors).

[0039] The AD conversion unit 114 converts the analog signal output of the first gas sensor 11 into a digital signal. The calibration unit 14 may calibrate the concentration of the gas 503 (see FIG. 1) calculated based on the output of the first gas sensor 11, based on the calibration information Ic. That is, the calibration unit 14 may calibrate the calculated concentration of the gas 503 after the concentration of the gas 503 is calculated. The calibration unit 14 may calibrate the concentration of the gas 503 while calculating it, based on the output of the first gas sensor 11 and the calibration information Ic.

[0040] In this example, the calibration unit 14 includes a calculation unit 110 and a storage unit 112. The calculation unit 110 calculates the concentration of the gas 503 based on the digital signal of the first gas sensor 11 converted by the AD conversion unit 114. The storage unit 112 stores the concentration of the gas 503 calculated by the calculation unit 110. The storage unit 112 may store a correlation between the concentration of the gas 503 calculated by the calculation unit 110 and the calibration information Ic. This correlation is referred to as a correlation Cr. The correlation Cr may be a correlation function or a correlation table.

[0041] The calculation unit 110 may calculate the first calibration information Ic' based on the calibration information Ic received by the receiving unit 10 and the correlation Cr stored in the memory unit 112. The first calibration information Ic' is calibration information for calibrating the concentration of the gas 503 (see FIG. 1) of the measurement target 501 (see FIG. 1) calculated based on the output of the first gas sensor 11. The first calibration information Ic' is information related to calibration for bringing the concentration of the gas 503 (see FIG. 1) closer to the true value of the concentration. The calibration information Ic' may be different from the calibration information Ic, or may be the same as the calibration information Ic.

[0042] The calculation unit 110 is, for example, a central processing unit (CPU). The calculation unit 110 and the control unit 15 may be integrated into one CPU.

[0043] The transmitter 13 transmits the first calibration information Ic' of the first gas sensor 11. When the living body 90 (see FIG. 1) remains in the measurement target 501 (see FIG. 1), the transmitter 13 may transmit the first calibration information Ic' to an open space in the measurement target 501. When the living body 90 moves from the measurement target 501 to the measurement target 502 (see FIG. 1), the transmitter 13 may transmit the first calibration information Ic' to the internal space 508. The transmitter 13 may wirelessly transmit the first calibration information Ic'.

[0044] When the first gas sensor device 100 does not have the first gas sensor 11, the first gas sensor device 100 may not have the AD conversion section 114 either. When the first gas sensor device 100 does not have the first gas sensor 11 and the AD conversion section 114, the analog signal output of the first gas sensor 11 may be converted into a digital signal by the AD conversion section 114 disposed outside the first gas sensor device 100. The digital signal converted by the AD conversion section 114 may be transmitted to the first gas sensor device 100. The same applies to the case where the second gas sensor device 200 does not have the second gas sensor 21 (described later).

[0045] The second gas sensor apparatus 200 has a receiving section 20 and a calibration section 24. The second gas sensor apparatus 200 may have a control section 25, a display section 22, a transmission section 23, and an AD conversion section 124. The functions of the control section 25, the display section 22, and the transmission section 23 may be the same as those of the control section 15, the display section 12, and the transmission section 13 in the first gas sensor apparatus 100, respectively.

[0046] The receiving unit 20 receives the first calibration information Ic' transmitted by the transmitting unit 13 of the first gas sensor device 100. The second gas sensor device 200 may include a second gas sensor 21. The calibration unit 24 calibrates the concentration of the gas 504 (see FIG. 1) in the measurement target 502 (see FIG. 1) calculated based on the output of the second gas sensor 21, based on the first calibration information Ic' received by the receiving unit 20. This makes it easier for the measurement value of the concentration of the gas 504 by the second gas sensor 21 to be more accurate than before calibration.

[0047] The AD conversion unit 124 converts the analog signal output of the second gas sensor 21 into a digital signal. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21, based on the first calibration information Ic'. That is, the calibration unit 24 may calibrate the calculated concentration of the gas 504 after the concentration of the gas 504 is calculated. The calibration unit 24 may calibrate the concentration of the gas 504 while calculating it, based on the output of the second gas sensor 21 and the first calibration information Ic'.

[0048] As described above, the first calibration information Ic' is calibration information for calibrating the concentration of the gas 503 (see FIG. 1) in the measurement target 501 (see FIG. 1) calculated based on the output of the first gas sensor 11. When the calibration unit 14 calibrates the concentration of the gas 503 (see FIG. 1) in a state where the first gas sensor device 100 is placed in the measurement target 501 (in this example, a state where the living body 90 is present outdoors) and the first gas sensor device 100 moves from the measurement target 501 to the measurement target 502, the first gas sensor 11 is highly likely to be able to accurately measure the concentration of the gas 504 in the measurement target 502. For this reason, the calibration unit 24 of the second gas sensor device 200 can easily accurately calibrate the concentration of the gas 504 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic'.

[0049] The gas sensor system 400 may include a memory unit 122. In this example, the second gas sensor device 200 includes the memory unit 122. In this example, the calibration unit 24 includes a calculation unit 120 and a memory unit 122. The functions of the calculation unit 120 and the memory unit 122 may be the same as those of the calculation unit 110 and the memory unit 112 in the calibration unit 14 of the first gas sensor device 100, respectively.

[0050] The memory unit 122 may store a correlation between the concentration of the gas 504 calculated by the calculation unit 120 and the first calibration information Ic'. This correlation is referred to as a correlation Cr'. The calculation unit 120 may calculate the second calibration information Ic'' based on the first calibration information Ic' received by the receiving unit 20 and the correlation Cr' stored in the memory unit 122.

[0051] The second calibration information Ic'' is calibration information for calibrating the concentration of the gas 504 (see FIG. 1) of the measurement target 502 (see FIG. 1) calculated based on the output of the second gas sensor 21. The second calibration information Ic'' is information related to calibration for bringing the concentration of the gas 504 (see FIG. 1) closer to the true value of the concentration. The second calibration information Ic'' may be different from the first calibration information Ic', or may be the same as the first calibration information Ic'.

[0052] In the gas sensor system 400, the receiving unit 20 receives the first calibration information Ic', and the calibration unit 24 calibrates the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21, based on the first calibration information Ic'. This allows the gas sensor system 400 to calibrate the concentration of the gas 504 calculated based on the output of the second gas sensor 21.

[0053] When the internal space 508 (see FIG. 1) is a closed space isolated from the outdoors, the CO2 (carbon dioxide) concentration in the internal space 508 may not reach the above-mentioned reference value (e.g., 400 ppm) even during a time period (e.g., the middle of the night) when the activity of the living body 90 is likely to be suppressed. When the CO2 (carbon dioxide) concentration in the internal space 508 does not reach the reference value, it is difficult for the second gas sensor 21 to self-calibrate the concentration of the measured gas 504 (see FIG. 1).

[0054] In this example, in a state where the first gas sensor device 100 is placed in the measurement target 501 (in this example, a state where the living body 90 is outdoors), the concentration of the gas 503 (see FIG. 1) calculated based on the output of the first gas sensor 11 is calibrated by the calibration unit 14. Therefore, when the living body 90 moves from the measurement target 501 (see FIG. 1) to the internal space 508 (see FIG. 1), the first gas sensor device 100 can easily accurately measure the concentration of the gas 504 in the internal space 508.

[0055] In this example, after the living body 90 moves to the internal space 508, the transmitter 13 transmits the first calibration information Ic'. Therefore, the gas sensor system 400 can calibrate the concentration of the gas 504 calculated based on the output of the second gas sensor 21 even if the second gas sensor device 200 is placed in an environment where self-calibration is difficult (in this example, the internal space 508). The gas sensor system 400 can calibrate the concentration of the gas 504 calculated based on the output of the second gas sensor 21 with the second gas sensor device 200 placed in the measurement target 502 (see FIG. 1).

[0056] The calibration information Ic may be an indication value of the concentration of the gas 503 (see FIG. 1) in the measurement target 501 (see FIG. 1). The indication value of the concentration of the gas 503 may be the concentration of the gas 503 calculated based on the output of the gas sensor 600 (see FIG. 1).

[0057] A predetermined distance between the gas sensor 600 and the first gas sensor 11 is set as a distance dp1. When the distance between the gas sensor 600 and the first gas sensor 11 is less than the distance dp1, the gas sensor 600 and the first gas sensor 11 are highly likely to be disposed in a measurement target 501 having the same concentration of the gas 503. For this reason, it is preferable that the concentration of the gas 503 calculated based on the output of the gas sensor 600 and the concentration of the gas 503 calculated based on the output of the first gas sensor 11 match. For this reason, when the distance between the gas sensor 600 and the first gas sensor 11 is less than the distance dp1, the calibration information Ic may be an indication value of the concentration of the gas 503 in the measurement target 501. The distance dp1 is, for example, 10 m. When the gas sensor 600 and the first gas sensor 11 are disposed in the internal space 508, the distance dp1 may be 5 m.

[0058] The calibration information Ic may be a calibration amount of the concentration of the gas 503 (see FIG. 1) in the measurement target 501 (see FIG. 1). The concentration of the gas 503 calculated based on the output of the gas sensor 600 (see FIG. 1) is defined as concentration C0. The concentration of the gas 503 calculated based on the output of the first gas sensor 11 is defined as concentration C1. The calibration amount of the concentration of the gas 503 may be the difference between the concentration C0 and the concentration C1.

[0059] When the calibration amount of the concentration of the gas 503 is the difference between the concentrations C0 and C1, the calibration unit 14 may calibrate the output of the gas 503 by the first gas sensor 11 by the difference. The calibration unit 14 may offset the output of the gas 503 by the first gas sensor 11 by the difference.

[0060] When it is assumed that the state of the gas sensor 600 and the state of the first gas sensor 11 are similar, the calibration information Ic is preferably a calibration amount of the concentration of the gas 503 (see FIG. 1). The state of the gas sensor 600 and the state of the first gas sensor 11 are similar when, for example, there is a high probability that the deterioration state of the gas sensor 600 and the deterioration state of the first gas sensor 11 are similar. The case where there is a high probability that the deterioration state of the gas sensor 600 and the deterioration state of the first gas sensor 11 are similar may be a case where at least one of the following cases is satisfied: the most recent calibration time of the gas sensor 600 and the most recent calibration time of the first gas sensor 11 are the same; the environment in which the gas sensor 600 is placed and the environment in which the first gas sensor 11 is placed are similar; and the specifications of the gas sensor 600 and the specifications of the first gas sensor 11 are the same. The environment in which the gas sensor 600 is placed may refer to at least one of the temperature, humidity, and concentration of the gas 503 at the location where the gas sensor 600 is placed.

[0061] The first calibration information Ic′ may be an indication value of the concentration of the gas 504 (see FIG. 1) in the measurement target 502 (see FIG. 1). The indication value of the concentration of the gas 504 may be the concentration of the gas 504 calculated based on the output of the first gas sensor 11.

[0062] A predetermined distance between the first gas sensor 11 and the second gas sensor 21 is set as a distance dp2. As in the case of the calibration information Ic, when the distance between the first gas sensor 11 and the second gas sensor 21 is less than the distance dp2, the first calibration information Ic′ may be an indication of the concentration of the gas 504 in the measurement object 502.

[0063] The first calibration information Ic' may be a calibration amount of the concentration of the gas 504 (see FIG. 1) in the measurement target 502 (see FIG. 1) similarly to the calibration information Ic. When the state of the first gas sensor 11 and the state of the second gas sensor 21 are assumed to be similar to each other, the first calibration information Ic' is preferably a calibration amount of the concentration of the gas 504 for the same reasons as those described above for the calibration information Ic.

[0064] The concentration of the gas 504 (see FIG. 1) calculated based on the output of the first gas sensor 11 is defined as concentration C1'. The concentration of the gas 504 calculated based on the output of the second gas sensor 21 is defined as concentration C2. When the calibration amount of the concentration of the gas 504 is the difference between the concentration C1' and the concentration C2, the calibration unit 24 may calibrate the concentration C2 calculated based on the output of the second gas sensor 21 by the amount of the difference.

[0065] The transmitting unit 23 of the second gas sensor device 200 may transmit the concentration C2 to the first gas sensor device 100. In FIG. 2, a path for transmitting the concentration C2 to the first gas sensor device 100 is indicated by a rough dashed arrow. When the transmitting unit 23 transmits the concentration C2 to the first gas sensor device 100, the concentration C2 may be the concentration of the gas 504 before being calibrated by the calibrating unit 24. The receiving unit 10 of the first gas sensor device 100 may receive the concentration C2. The calculating unit 110 of the first gas sensor device 100 may calculate the difference between the concentration C1′ and the concentration C2. The transmitting unit 13 may transmit the difference to the receiving unit 20. The calibrating unit 24 may calibrate the concentration C2 by the difference received by the receiving unit 20.

[0066] The first gas sensor apparatus 100 may be self-calibrated. When the first gas sensor 11 is a CO2 (carbon dioxide) sensor, the first gas sensor apparatus 100 may be self-calibrated by an ABC (Automatic Baseline Correction or Automatic Background Calibration) algorithm. When the measurement target 501 (see FIG. 1) is in an environment (e.g., outdoors) in which self-calibration is possible and the first gas sensor apparatus 100 is placed on the measurement target 501, the first gas sensor apparatus 100 may be self-calibrated while placed on the measurement target 501. The concentration C2 calculated based on the output of the second gas sensor 21 may be calibrated based on the first calibration information Ic' of the self-calibrated first gas sensor 11.

[0067] The first gas sensor device 100 may or may not include the first gas sensor 11. In this example, the first gas sensor device 100 includes the first gas sensor 11. If the first gas sensor device 100 does not include the first gas sensor 11, the output of the first gas sensor 11 may be sent to the rich calibration unit 14. The same applies to the second gas sensor device 200.

[0068] In this example, the measurement target 502 for which the concentration C1' is calculated based on the output of the first gas sensor 11 is the same as the measurement target 502 for which the concentration C2 is calculated based on the output of the second gas sensor 21. The measurement target 502 for which the concentration C1' is calculated and the measurement target 502 for which the concentration C2 is calculated being the same may mean that the type of measurement target gas of the first gas sensor apparatus 100 and the type of measurement target gas of the second gas sensor apparatus 200 are the same in the measurement target 502. The measurement target gas of the first gas sensor apparatus 100 and the second gas sensor apparatus 200 may be CO2 (carbon dioxide), CH4 (methane), or alcohol.

[0069] The fact that the measurement target 502 for which the concentration C1' is calculated and the measurement target 502 for which the concentration C2 is calculated are the same may mean that the first gas sensor 11 and the second gas sensor 21 share the same space (in this example, the internal space 508 (see FIG. 1)). The fact that the space is the same may mean at least one of the following: the temperature or humidity in the space is the same, the short-range wireless (such as wifi (registered trademark)) ID is the same, and, when the first gas sensor apparatus 100 and the second gas sensor apparatus 200 are mobile terminals, the amplitude and frequency of the sound waves acquired by the mobile terminals are the same.

[0070] In addition, in the measurement target 502, the type of the measurement target gas whose concentration C1' is calculated based on the output of the first gas sensor 11 and the type of the measurement target gas whose concentration C2 is calculated based on the output of the second gas sensor 21 may be different. The type of the measurement target gas whose concentration C1' is calculated based on the output of the first gas sensor 11 is defined as gas type G1. The type of the measurement target gas whose concentration C2 is calculated based on the output of the second gas sensor 21 is defined as gas type G2. When the gas type G1 and the gas type G2 are different, the first calibration information Ic' may include information on the gas type G1. The calibration unit 24 may calibrate the gas concentration of the gas type G2 calculated based on the output of the second gas sensor based on the first calibration information Ic'.

[0071] When the first gas sensor 11 is disposed in the measurement object 501 and the second gas sensor 21 is disposed in the measurement object 502, the concentration of the gas 503 in the measurement object 501 is likely to be different from the concentration of the gas 504 in the measurement object 502. For this reason, when the first gas sensor 11 is disposed in the measurement object 501 and the second gas sensor 21 is disposed in the measurement object 502, the calibration unit 24 does not need to calibrate the concentration C2 calculated based on the output of the second gas sensor 21.

[0072] 3 is a block diagram showing another example of a gas sensor system 400 according to an embodiment of the present invention. The calibration reliability of the first gas sensor device 100 is set as calibration reliability R1. Reliability information indicating the calibration reliability R1 is set as reliability information Ir1. The reliability information Ir1 is information indicating the reliability of the calibration performed on the first gas sensor device 100 when the first gas sensor device 100 has been calibrated. The reliability information Ir1 may include at least one of information on the time elapsed since the most recent calibration, information on the time elapsed since the first gas sensor 11 was installed, information on the calibration means, information on the diversity of the calibration source, information on the number of calibrations, information on the calibration frequency, information on the gas concentration at the time of calibration, and information on the environment at the time of calibration.

[0073] The calibration reliability R1 tends to be higher as the time that has elapsed since the most recent calibration is shorter. The reliability information Ir1 may be stored in the storage unit 112.

[0074] The information on the calibration means is information on whether the first gas sensor device 100 is self-calibrated or is calibrated by another sensor (for example, the gas sensor 600 (see FIG. 1)). When the first gas sensor device 100 is calibrated by another sensor, the information on the calibration means may include at least one of the distance between the first gas sensor and the other sensor and the calibration state of the other sensor. Note that the first gas sensor device 100 may self-calibrate the first gas sensor 11 by having the calibration unit 14 calibrate the output of the first gas sensor 11.

[0075] The information related to the diversity of calibration sources may include at least one of the number of sensors (e.g., gas sensor 600 (see FIG. 1)) that are the calibration sources of the first gas sensor 11 and the number of specifications of the calibration source sensors. The sensor specifications are, for example, the sensor specifications. If the first gas sensor device 100 is self-calibrated, the number of calibration source sensors and the number of specifications of the calibration source sensors may include the first gas sensor 11. The greater the number of calibration source sensors, the higher the calibration reliability R1 is likely to be. The greater the number of specifications of the calibration source sensor, the higher the calibration reliability R1 is likely to be.

[0076] The information on the number of calibrations is information on the number of times the first gas sensor device 100 has been calibrated from a predetermined past point in time to the present. The number of calibrations may include cases where the first gas sensor device 100 has been self-calibrated and cases where the first gas sensor device 100 has been calibrated by another sensor. The calibration reliability R1 tends to be higher as the number of calibrations increases.

[0077] The information on the calibration frequency is information on the number of times the first gas sensor device 100 is calibrated per a predetermined time period. The number of times may include the number of times the first gas sensor device 100 is self-calibrated and the number of times the first gas sensor device 100 is calibrated by another sensor. The calibration reliability R1 tends to be higher as the calibration frequency increases.

[0078] The information on the gas concentration at the time of calibration is information on the gas concentration at the time of calibration of the first gas sensor device 100. The time of calibration of the first gas sensor device 100 may include the time of self-calibration of the first gas sensor device 100 and the time of calibration by another sensor. When the first gas sensor device 100 is calibrated when measuring a gas concentration that is not within a predetermined range (e.g., an abnormal gas concentration), the calibration reliability R1 is likely to be lower than when the first gas sensor device 100 is calibrated when measuring a gas concentration of a reference value.

[0079] The environmental information at the time of calibration may include the temperature, humidity, or air pressure of the space (e.g., the measurement target 501 (see FIG. 1)) in which the first gas sensor 11 is placed at the time of calibration of the first gas sensor device 100. When the first gas sensor 11 is calibrated at a temperature (e.g., an abnormal value of temperature), humidity (e.g., an abnormal value of humidity), or air pressure (e.g., an abnormal value of air pressure) that is not within a predetermined range, the calibration reliability R1 is likely to be lower than when the first gas sensor 11 is calibrated at a reference value of temperature, humidity, or air pressure.

[0080] The transmitting unit 13 may further transmit reliability information Ir1. The receiving unit 20 of the second gas sensor device 200 may further receive the reliability information Ir1. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1 ) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' and the calibration reliability R1 of the first gas sensor device 100. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1 ) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the reliability information Ir1.

[0081] The calibration reliability of the second gas sensor device 200 is defined as calibration reliability R2. Reliability information indicating the calibration reliability R2 is defined as reliability information Ir2. The reliability information Ir2 is information indicating the reliability of the calibration performed on the second gas sensor device 200 when the second gas sensor device 200 has been calibrated. The reliability information Ir2 may include information similar to the reliability information Ir1 described above. The reliability information Ir2 and the reliability information Ir1 received by the receiving unit 20 may be stored in the storage unit 122.

[0082] A predetermined threshold value of the calibration reliability R1 is defined as a first threshold value Rth1. The first threshold value Rth1 may be different for each measurement target 501 (see FIG. 1). When the calibration reliability R1 exceeds the first threshold value Rth1, the user of the gas sensor system 400 may trust the concentration of the gas 503 (see FIG. 1) calculated based on the output of the first gas sensor 11.

[0083] A predetermined threshold value of the calibration reliability R2 is set as a second threshold value Rth2. The second threshold value Rth2 may be different for each measurement target 502 (see FIG. 1). When the calibration reliability R2 exceeds the second threshold value Rth2, the user of the gas sensor system 400 may trust the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21. The second threshold value Rth2 and the first threshold value Rth1 may be the same or different.

[0084] The reliability information Ir2 may include information on the reliability of the self-calibration in the second gas sensor device 200. The self-calibration refers to calibration that is not based on another gas sensor (for example, the first gas sensor device 100 in this example). When the second gas sensor 21 is a CO2 (carbon dioxide) sensor, the self-calibration may refer to calibration by an ABC (Automatic Baseline Correction or Automatic Background Calibration) algorithm.

[0085] The information on the reliability of the self-calibration in the second gas sensor apparatus 200 may include information on whether the second gas sensor apparatus 200 has a self-calibration function or not. The second gas sensor apparatus 200 may self-calibrate the second gas sensor apparatus 200 by the calibration unit 24 calibrating the output of the second gas sensor 21.

[0086] When the calibration reliability R1 is equal to or less than the first threshold value Rth1, the calibration unit 24 does not need to calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic'. When the calibration reliability R2 of the self-calibration of the second gas sensor device 200 is equal to or less than the second threshold value Rth2 and the calibration reliability R1 exceeds the first threshold value Rth1, the calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic'. When the calibration reliability R2 of the self-calibration of the second gas sensor device 200 is equal to or less than the second threshold value Rth2, this may include a case where the second gas sensor device 200 does not have a self-calibration function. A case in which the calibration reliability R2 of the self-calibration of the second gas sensor apparatus 200 is equal to or lower than the second threshold value Rth2 may include a case in which the self-calibration is difficult because the second gas sensor apparatus 200 is an old sensor apparatus, or the like.

[0087] The calibration unit 24 may compare the calibration reliability R1 of the first gas sensor device 100 received by the receiving unit 20 with the calibration reliability R2 of the second gas sensor device 200. The calibration reliability R2 may include the calibration reliability R2 of the self-calibration of the second gas sensor device 200 and the calibration reliability R2 when the second gas sensor device 200 is calibrated by another sensor.

[0088] When the calibration reliability R1 of the first gas sensor device 100 is higher than the calibration reliability R2 of the second gas sensor device 200, the calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received by the receiving unit 20. By calibrating the concentration of the gas 504, the concentration of the gas 504 calculated based on the output of the second gas sensor 21 is more likely to be accurate. When the calibration reliability R1 is equal to or lower than the calibration reliability R2, the calibration unit 24 does not need to calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21, and may calibrate it based on the second calibration information Ic''.

[0089] When the calibration reliability R2 is equal to or less than the second threshold value Rth2, the transmitting unit 23 of the second gas sensor apparatus 200 may transmit information to another gas sensor apparatus (e.g., at least one of the gas sensor 600 and the first gas sensor apparatus 100) requesting that the second gas sensor apparatus 200 transmit calibration information for calibrating the output of the second gas sensor 21. When the calibration reliability R2 is equal to or less than the second threshold value Rth2, the second gas sensor apparatus 200 may be in a standby state. This makes it easier to reduce the power consumption of the second gas sensor apparatus 200.

[0090] The calibration reliability R1 of the first gas sensor device 100 received by the receiving unit 20 may be stored in the storage unit 122. The calibration reliability R1 stored in the storage unit 122 may refer to the past calibration reliability R1 of the first gas sensor device 100. The calibration unit 24 may compare the calibration reliability R1 stored in the storage unit 122 with the current calibration reliability R1 of the first gas sensor device 100 received by the receiving unit 20. When the current calibration reliability R1 of the first gas sensor device 100 is higher than the calibration reliability R1 of the first gas sensor device 100 stored in the storage unit 122, the calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1 ) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic′.

[0091] A calibration reliability serving as a reference for calibrating the concentration of the gas 504 calculated based on the output of the second gas sensor 21 is defined as a reference calibration reliability Cs. Reference reliability information indicating the reference calibration reliability Cs is defined as reference reliability information Irs. The reference calibration reliability Cs may be at least one of the calibration reliability R1 of the first gas sensor device 100 and the calibration reliability R2 of the second gas sensor device 200. When the calibration reliability R1 of the first gas sensor device 100 received by the receiving unit 20 is higher than the reference calibration reliability Cs, the calibration unit 24 may calibrate the gas concentration of the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic'.

[0092] The storage unit 122 may store the reference reliability information Cs. When the calibration reliability R1 of the first gas sensor device 100 received by the receiving unit 20 is higher than the reference calibration reliability Cs, the storage unit 122 may update the reference calibration reliability Cs based on the received calibration reliability R1 and store the updated reference calibration reliability Cs. The calibration unit 24 may calibrate the gas concentration of the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the updated reference reliability Cs.

[0093] When the calibration reliability R1 of the first gas sensor device 100 received by the receiving unit 20 is higher than the reference calibration reliability Cs, the storage unit 122 may update the reference calibration reliability Cs to the calibration reliability R1 and store the updated reference calibration reliability Cs. When the calibration reliability R1 is lower than the reference calibration reliability Cs, the storage unit 122 does not need to update the reference calibration reliability Cs.

[0094] The reference reliability information Cs stored in the storage unit 122 may be the reference reliability information Cs updated based on the calibration reliability R1, or may be the calibration reliability R2. The calibration reliability R2 may include the calibration reliability R2 of the self-calibration of the second gas sensor device 200 and the calibration reliability R2 in the case where the second gas sensor device 200 is calibrated by another sensor.

[0095] 4 is a block diagram showing another example of a gas sensor system 400 according to an embodiment of the present invention. In the gas sensor system 400 of this example, the first gas sensor device 100 further includes a position information acquisition unit 16, and the second gas sensor device 200 further includes a position information acquisition unit 26. The gas sensor system 400 of this example differs from the example shown in FIG. 3 in this respect.

[0096] The position information acquiring section 16 acquires position information of the first gas sensor device 100. The position information acquiring section 26 acquires position information of the second gas sensor device 200. The position information acquiring section 16 and the position information acquiring section 26 are, for example, a global positioning system (GPS).

[0097] The position information of the first gas sensor device 100 is defined as position information Ip1. The reliability information Ir1 may include the position information Ip1. The position information of the second gas sensor device 200 is defined as position information Ip2. The reliability information Ir2 may include the position information Ip2.

[0098] The distance between the position of the first gas sensor device 100 and the position of the second gas sensor device 200 acquired by the position information acquisition unit 26 is defined as distance d. As described above, the predetermined distance between the position of the first gas sensor 11 and the position of the second gas sensor 21 is distance dp2. The distance dp2 may refer to a distance at which the first gas sensor 11 and the second gas sensor 21 are highly likely to be disposed in the same space (for example, the internal space 508 in FIG. 1). The same space may refer to the type of measurement target gas whose concentration C1' is calculated based on the output of the first gas sensor 11 being the same as the type of measurement target gas whose concentration C2 is calculated based on the output of the second gas sensor 21, or may refer to the ID of a short-distance wireless communication (such as wifi (registered trademark)) in the space in which the first gas sensor 11 is disposed being the same as the ID of a short-distance wireless communication in the space in which the second gas sensor 21 is disposed.

[0099] The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the distance d and the first calibration information Ic'. When the distance d is less than the distance dp2, the calibration unit 24 may calibrate the concentration of the gas 504 calculated based on the output of the second gas sensor 21. When the distance d is equal to or greater than the distance dp2, the calibration unit 24 may not need to calibrate the concentration of the gas 504 calculated based on the output of the second gas sensor 21. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the distance d.

[0100] The reliability information Ir1 may include information on the user of the first gas sensor device 100. The user information may include a plurality of user names and a past usage history of the first gas sensor device 100 for each user name. The past usage history may include a past usage situation. An example of a past usage situation is a situation in which a specific user intentionally blows breath onto the first gas sensor device 100. The calibration reliability R1 when the first gas sensor device 100 is used by the specific user may be lower than the calibration reliability R1 when the first gas sensor device 100 is used by another user. The specific user may be stored in the memory unit 122 as a person to be watched out for.

[0101] Fig. 5 is a block diagram showing another example of a gas sensor system 400 according to an embodiment of the present invention. The gas sensor system 400 of this example differs from the gas sensor system 400 shown in Fig. 2 in that it includes a plurality of first gas sensor devices 100 (first gas sensor devices 100-1 to 100-n). In Fig. 5, the gas 503 in the measurement object 501 and the gas 504 in the measurement object 502 are not shown.

[0102] Each of the first gas sensor devices 100-1 to 100-n may be possessed by each of the plurality of living bodies 90 (living bodies 90-1 to 90-n). The plurality of first gas sensor devices 100 may be moved from the measurement object 501 to the measurement object 502 by the movement of the plurality of living bodies 90 from the measurement object 501 to the measurement object 502.

[0103] In this example, the first gas sensor apparatus 100-1 to 100-n have receiving sections 10-1 to 10-n, respectively, calibration sections 14-1 to 14-n, and transmission sections 13-1 to 13-n, respectively. In this example, the first gas sensor apparatus 100-1 to 100-n have first gas sensors 11-1 to 11-n, respectively. In FIG. 5, the internal configuration of the first gas sensor apparatus 100 is omitted.

[0104] A plurality of gas sensors 600 (gas sensors 600-1 to 600-n) may be disposed in the measurement target 501. The gas sensors 600-1 to 600-n may transmit calibration information Ic1 to Icn, respectively. The calibration information Ic1 to Icn may be different from each other or may be the same.

[0105] The calibration unit 14-1 may calibrate the concentration of the gas 503 (see FIG. 1) in the measurement target 501, which is calculated based on the output of the first gas sensor 11-1, based on the calibration information Ic1 to Icn. The calibration unit 14-2 may calibrate the concentration of the gas 503 in the measurement target 501, which is calculated based on the output of the first gas sensor 11-2, based on the calibration information Ic1 to Icn. Similarly, the calibration unit 14-n may calibrate the concentration of the gas 503 in the measurement target 501, which is calculated based on the output of the first gas sensor 11-n, based on the calibration information Ic1 to Icn.

[0106] In this example, the calibration section 14 of one first gas sensor device 100 calibrates, based on a plurality of pieces of calibration information Ic, the concentration of the gas 503 (see FIG. 1) calculated based on the output of the first gas sensor 11 of the one first gas sensor device 100. For this reason, the output of the first gas sensor 11 is more likely to be calibrated to a more accurate concentration than when the output is calibrated based on a single piece of calibration information Ic.

[0107] In this example, the calibration units 14-1 to 14-n include calculation units 120-1 to 120-n, respectively. The calculation units 120-1 to 120-n may calculate first calibration information Ic'1 to first calibration information Ic'n, respectively. The gas concentrations calculated based on the outputs of the first gas sensors 11-1 to 11-n may be calibrated based on the first calibration information Ic'1 to first calibration information Ic'n, respectively.

[0108] The transmitting units 13-1 to 13-n may transmit the first calibration information Ic'1 to Ic'n, respectively. When a plurality of living bodies 90 (see FIG. 1) move to the measurement target 502, the transmitting units 13-1 to 13-n may transmit the first calibration information Ic'1 to Ic'n, respectively, to the internal space 508.

[0109] The receiving unit 20 of the second gas sensor device 200 may receive the first calibration information Ic' from each of the multiple first gas sensor devices 100. In this example, the receiving unit 20 receives the first calibration information Ic'1 to Ic'n transmitted by the transmitting units 13-1 to 13-n, respectively.

[0110] The calibration section 24 of the second gas sensor device 200 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21, based on a plurality of pieces of first calibration information Ic'. In this example, the calibration section 24 calibrates the concentration of the gas 504, based on the first calibration information Ic'1 to Ic'n. This makes it easier for the output of the second gas sensor 21 to be calibrated to a more accurate concentration than when the output is calibrated based on a single piece of first calibration information Ic'.

[0111] The calibration reliabilities of the first gas sensors 11-1 to 11-n are respectively referred to as calibration reliability R11 to calibration reliability R1n. The reliability information indicating the calibration reliability R11 to calibration reliability R1n are respectively referred to as reliability information Ir1-1 to Ir1-n. The transmitting units 13 (see FIGS. 2 to 4) of the plurality of first gas sensor devices 100 may transmit the reliability information Ir1 of each of the first gas sensor devices 100. In this example, the transmitting units 13-1 to 13-n transmit the reliability information Ir1-1 to Ir1-n, respectively.

[0112] The receiving unit 20 of the second gas sensor device 200 may receive the reliability information Ir1-1 to Ir1-n. The calibration unit 24 may weight the calibration reliability R11 to R1n. Weighting the calibration reliability R11 to R1n means weighting the calibration reliability R1 with higher reliability more heavily than the calibration reliability R1 with lower reliability. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1 ), which is calculated based on the output of the second gas sensor 21, based on the weighted calibration reliability R1.

[0113] The reliability information Ir1-1 to Ir1-n may be stored in the storage unit 122. The calculation unit 120 may calculate weighting of the calibration reliability R11 to R1n based on the reliability information Ir1-1 to Ir1-n stored in the storage unit 122. The calculation unit 120 may calculate the second calibration information Ic'' by weighting the calibration reliability R11 to R1n. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the second calibration information Ic''. This makes it easier for the concentration of the gas 504 to be calibrated to an accurate concentration than when the concentration is calibrated based on the second calibration information Ic'' to which the calibration reliability R11 to R1n are not weighted.

[0114] When the reliability information Ir1 in which the calibration reliability R1 of the first gas sensor device 100 is less than the first threshold value Rth1 is included in any of the reliability information Ir1-1 to Ir1-n, the calculation unit 120 may calculate the weighting by excluding the calibration reliability R1 that is less than the first threshold value Rth1. The calculation unit 120 calculating the weighting by excluding the calibration reliability R1 may mean that the calculation unit 120 calculates the weighting for the calibration reliability R1 as zero.

[0115] The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21, based on the highest calibration reliability R1 among the calibration reliability R11 to calibration reliability R1n. The calibration unit 24 may calibrate the concentration of the gas 504 by weighting the highest calibration reliability R1 as 1 and the other calibration reliability R1 as zero.

[0116] 6 is a diagram showing an example of calibration of gas concentrations in the first gas sensor apparatus 100, the second gas sensor apparatus 200, and the third gas sensor apparatus 300 according to an embodiment of the present invention. The third gas sensor apparatus 300 may have a receiving section 30, a third gas sensor 31, a display section 32, a transmitting section 33, a calibration section 34, and a control section 35. A block diagram of the third gas sensor apparatus 300 may be the same as the block diagrams of the first gas sensor apparatus 100 and the second gas sensor apparatus 200 shown in FIGS. 2 to 4.

[0117] In this example, the first gas sensor device 100 moves from a measurement target 501 to a measurement target 505. The measurement target 505 may be outdoors or indoors. When the measurement target 505 is outdoors, the gas concentration of the measurement target gas calculated based on the output of the first gas sensor 11 in the measurement target 501 and the gas concentration of the measurement target gas calculated based on the output of the first gas sensor 11 in the measurement target 505 may be the same or different.

[0118] In this example, the transmitting unit 23 of the first gas sensor device 100 in the measurement target 505 transmits the first calibration information Icm. The transmitting units 23 of the first gas sensor devices 100-1 to 100-n may transmit the first calibration information Icm1 to Icmn, respectively. In this example, the receiving unit 30 of the third gas sensor device 300 in the measurement target 505 receives the first calibration information Icm. The receiving units 30 of the third gas sensor devices 300-1 to 300-n may receive the first calibration information Icm1 to Icmn, respectively.

[0119] In this example, the calibration section 34 of the third gas sensor apparatus 300 calibrates the gas concentration of the measurement object 505, which is calculated based on the output of the third gas sensor 31, based on the first calibration information Icm received by the receiving section 30. The calibration sections 34 of the third gas sensor apparatuses 300-1 to 300-n may calibrate the gas concentrations of the measurement object 505, which are calculated based on the output of the third gas sensor 31 of the third gas sensor apparatuses 300-1 to 300-n, based on the first calibration information Icm1 to Icmn, respectively.

[0120] In this example, the third gas sensor apparatus 300, in which the concentration of the gas in the measurement object 505 has been calibrated, moves from the measurement object 505 to the measurement object 502. In this example, the transmitting unit 33 of the third gas sensor apparatus 300 transmits the calibration information Ic' of the third gas sensor apparatus 300. The transmitting units 33 of the third gas sensor apparatus 300-1 to 300-n may transmit the calibration information Ic'1 to Ic'n, respectively. In this example, the receiving unit 20 of the second gas sensor apparatus 200 at the measurement object 502 receives the calibration information Ic'. The receiving unit 20 of the second gas sensor apparatus 200 may receive the calibration information Ic'1 to Ic'n.

[0121] In this example, the calibration section 24 of the second gas sensor device 200 calibrates the concentration of the gas 504 (see FIG. 1) in the measurement target 502, which is calculated based on the output of the second gas sensor 21, based on the calibration information Ic' received by the receiving section 20. In this example, multiple types of calibration information (calibration information Ic and calibration information Icm) are reflected in the calibration information Ic'. This makes it easier to calibrate the second gas sensor device 200 accurately than when one type of calibration information is reflected in the calibration information Ic' (for example, in the case of FIG. 5).

[0122] 7 is a diagram showing an example of calibration of gas concentrations in the gas sensor device 150 and the gas sensor device 250 according to an embodiment of the present invention. The gas sensor device 150 may be the same as the first gas sensor device 100 shown in FIGS. 1 to 6. The gas sensor device 250 may be the same as the second gas sensor device 200 shown in FIGS. 1 to 6.

[0123] 8 is a block diagram showing an example of a gas sensor apparatus 150 and a gas sensor apparatus 250 according to an embodiment of the present invention. The gas sensor apparatus 150 may be the same as the first gas sensor apparatus 100 shown in FIG. 4. The gas sensor apparatus 250 may be the same as the second gas sensor apparatus 200 shown in FIG.

[0124] The gas sensor device 150 includes a transmission unit 13. The transmission unit 13 transmits first calibration information Ic' to the second gas sensor device 250. The first calibration information Ic' is calibration information for calibrating the concentration of the gas 503 (see FIG. 1) in the measurement target 501 (see FIG. 7), which is calculated based on the output of the first gas sensor 11. The first gas sensor device 100 may be self-calibrated or may be calibrated based on another sensor (for example, the gas sensor 600 (see FIG. 7)).

[0125] The gas sensor device 250 includes a receiving unit 20 and a calibrating unit 24. The receiving unit 20 receives the first calibration information Ic'. The calibrating unit 24 calibrates the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21, based on the first calibration information Ic' received by the receiving unit 20.

[0126] The gas sensor device 150 may or may not include a first gas sensor 11. In this example, the gas sensor device 150 includes the first gas sensor 11. The gas sensor device 250 may or may not include a second gas sensor 21. In this example, the gas sensor device 250 includes the second gas sensor 21. When the gas sensor device 150 is a mobile terminal, the first gas sensor 11 may be provided in the gas sensor device 150. When the gas sensor device 250 is a mobile terminal, the second gas sensor 21 may be provided in the gas sensor device 250.

[0127] When the living body 90 (see FIG. 7) having the first gas sensor device 150 remains in the measurement target 501, the transmitting unit 13 may transmit the first calibration information Ic' to an open space in the measurement target 501. When the living body 90 moves to the measurement target 502 (see FIG. 1), the transmitting unit 13 may transmit the first calibration information Ic' to the internal space 508. The transmitting unit 13 may wirelessly transmit the first calibration information Ic'.

[0128] 1 and 2, the measurement target 502 for which the concentration C1' is calculated based on the output of the first gas sensor 11 and the measurement target 502 for which the concentration C2 is calculated based on the output of the second gas sensor 21 may be the same. As described above, the measurement target 502 for which the concentration C1' is calculated and the measurement target 502 for which the concentration C2 is calculated being the same may mean that the type of measurement target gas of the first gas sensor apparatus 150 and the type of measurement target gas of the second gas sensor apparatus 250 are the same in the measurement target 502. The measurement target gas of the first gas sensor apparatus 150 and the second gas sensor apparatus 250 may be CO2 (carbon dioxide), CH4 (methane), or alcohol.

[0129] The measurement target 502 for which the concentration C1' is calculated and the measurement target 502 for which the concentration C2 is calculated being the same may refer to the first gas sensor 11 and the second gas sensor 21 sharing the same space (in this example, the internal space 508 (see FIG. 7)) as described above. The same space may refer to at least one of the following: the temperature or humidity in the space is the same, the short-range wireless (such as wifi (registered trademark)) ID is the same, and, when the gas sensor device 150 and the gas sensor device 250 are mobile terminals, the amplitude and frequency of the sound waves acquired by the mobile terminals are the same.

[0130] The second gas sensor 21 may be disposed in the internal space 508 (see FIG. 7). In this example, the gas sensor device 250 includes the second gas sensor 21, and the gas sensor device 250 is disposed in the internal space 508.

[0131] The transmitting unit 13 may transmit reliability information Ir1 indicating the calibration reliability R1 of the first gas sensor device 150 to the second gas sensor device 250. The receiving unit 20 may receive the reliability information Ir1. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1 ) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' and the calibration reliability R1 of the first gas sensor device 150. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1 ) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the reliability information Ir1.

[0132] When the reliability of the self-calibration of the second gas sensor apparatus 250 is equal to or lower than the second threshold value Rth2 and the calibration reliability R1 exceeds the first threshold value Rth1, the calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21, based on the first calibration information Ic'. When the reliability of the self-calibration of the second gas sensor apparatus 250 is equal to or lower than the second threshold value Rth2, this may include a case where the second gas sensor apparatus 250 does not have a self-calibration function.

[0133] The calibration unit 24 may compare the calibration reliability R1 of the first gas sensor device 150 received by the receiving unit 20 with the calibration reliability R2 of the second gas sensor device 250. The calibration reliability R2 may include the calibration reliability R2 of the self-calibration of the second gas sensor device 250 and the calibration reliability R2 when the second gas sensor device 250 is calibrated by another sensor.

[0134] When the calibration reliability R1 is higher than the calibration reliability R2, the calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received by the receiving unit 20. When the calibration reliability R1 is higher than the calibration reliability R2, the concentration of the gas 504 is calibrated, so that the concentration of the gas 504 calculated based on the output of the second gas sensor 21 is more likely to be accurate. When the calibration reliability R1 is equal to or lower than the calibration reliability R2, the calibration unit 24 may not calibrate the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21, and may calibrate it based on the second calibration information Ic''. The second calibration information Ic'' is calibration information for calibrating the concentration of the gas 504 (see FIG. 7) of the measurement target 502 (see FIG. 7) calculated based on the output of the second gas sensor 21.

[0135] The gas sensor device 250 may further include a storage unit 122. The calibration reliability R1 of the first gas sensor device 150 received by the receiving unit 20 may be stored in the storage unit 122. The calibration reliability R1 stored in the storage unit 122 may indicate a past calibration reliability of the first gas sensor device 150. The calibration unit 24 may compare the calibration reliability R1 stored in the storage unit 122 with the current calibration reliability R1 of the first gas sensor device 150 received by the receiving unit 20. If the current calibration reliability R1 is higher than the calibration reliability R1 stored in the storage unit 122, the calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic'.

[0136] When the calibration reliability R1 of the first gas sensor device 150 received by the receiving unit 20 is higher than the reference calibration reliability Cs, the calibration unit 24 may calibrate the gas concentration of the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic'. The storage unit 122 may store the reference reliability information Cs. When the calibration reliability R1 of the first gas sensor device 150 received by the receiving unit 20 is higher than the reference calibration reliability Cs, the storage unit 122 may update the reference calibration reliability Cs based on the received calibration reliability R1 and store the updated reference calibration reliability Cs. The calibration unit 24 may calibrate the gas concentration of the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the updated reference reliability Cs.

[0137] When the calibration reliability R1 of the first gas sensor device 150 received by the receiving unit 20 is higher than the reference calibration reliability Cs, the storage unit 122 may update the reference calibration reliability Cs to the calibration reliability R1 and store the updated reference calibration reliability Cs. When the calibration reliability R1 is lower than the reference calibration reliability Cs, the storage unit 122 does not need to update the reference calibration reliability Cs.

[0138] The reference reliability information Cs stored in the storage unit 122 may be the reference reliability information Cs updated based on the calibration reliability R1, or may be the calibration reliability R2. The calibration reliability R2 may include the calibration reliability R2 of the self-calibration of the second gas sensor apparatus 250 and the calibration reliability R2 in the case where the second gas sensor apparatus 200 is calibrated by another sensor.

[0139] The gas sensor device 150 may further include a position information acquisition section 16. The gas sensor device 250 may further include a position information acquisition section 26. The position information acquisition section 16 acquires position information of the first gas sensor device 100. The position information acquisition section 26 acquires position information of the second gas sensor device 200. The position information acquisition section 16 and the position information acquisition section 26 are, for example, a global positioning system (GPS (Global Positioning System)).

[0140] The position information of the first gas sensor apparatus 150 is defined as position information Ip1. The reliability information Ir1 may include the position information Ip1. The position information of the second gas sensor apparatus 250 is defined as position information Ip2. The reliability information Ir2 may include the position information Ip2.

[0141] The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21, based on the distance d between the positions of the first gas sensor device 150 and the second gas sensor device 250, and the first calibration information Ic'. As described above, the predetermined distance between the positions of the first gas sensor 11 and the second gas sensor 21 is the distance dp2. When the distance d is less than the distance dp2, the calibration unit 24 may calibrate the concentration of the gas 504 calculated based on the output of the second gas sensor 21. As described above, the distance dp2 may refer to a distance at which it is highly likely that the first gas sensor 11 and the second gas sensor 21 are disposed in the same space (for example, the internal space 508 in FIG. 7).

[0142] When the distance d exceeds the distance dp2, the calibration unit 24 does not need to calibrate the concentration of the gas 504 calculated based on the output of the second gas sensor 21. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the distance d.

[0143] 9 is a block diagram showing another example of the gas sensor device 150 and the gas sensor device 250 according to an embodiment of the present invention. In this example, a plurality of gas sensor devices 150 (gas sensor devices 150-1 to 150-n) are disposed on a measurement target 501, and one gas sensor device 250 is disposed on a measurement target 502. The gas sensor device 150 may be the same as the first gas sensor device 100 shown in FIG. 5. The gas sensor device 250 may be the same as the second gas sensor device 200 shown in FIG. 5.

[0144] Transmitting sections 13-1 to 13-n (see FIG. 8) of gas sensor devices 150-1 to 150-n may transmit first calibration information Ic'1 to first calibration information Ic'n, respectively. When a plurality of living bodies 90 (see FIG. 7) move toward measurement target 502, transmitting sections 13-1 to 13-n may transmit first calibration information Ic'1 to first calibration information Ic'n, respectively, into internal space 508 (see FIG. 7).

[0145] The receiving unit 20 of the gas sensor device 250 may receive the first calibration information Ic' from each of the multiple gas sensor devices 150. In this example, the receiving unit 20 receives the first calibration information Ic'1 to Ic'n transmitted by the transmitting units 13-1 to 13-n (see FIG. 8), respectively.

[0146] The calibration section 24 of the gas sensor device 250 may calibrate the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21, based on a plurality of pieces of first calibration information Ic'. In this example, the calibration section 24 calibrates the concentration of the gas 504 based on the first calibration information Ic'1 to Ic'n. This makes it easier for the concentration of the gas 504 to be calibrated to a more accurate concentration than when it is calibrated based on a single piece of first calibration information Ic'.

[0147] The transmitting sections 13 (see FIG. 8) of the plurality of gas sensor devices 150 may transmit the reliability information Ir1 of the respective first gas sensor devices 150. In this example, the transmitting sections 13-1 to 13-n transmit the reliability information Ir1-1 to Ir1-n, respectively.

[0148] The receiving unit 20 may receive the reliability information Ir1 of each of the multiple first gas sensor devices 150. In this example, the receiving unit 20 receives the reliability information Ir1-1 to Ir1-n. The reliability information Ir1-1 to Ir1-n may be stored in the storage unit 122.

[0149] The calibration unit 24 may weight the calibration reliability R11 to R1n of each of the first gas sensor devices 150. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the weighted calibration reliability R1. This makes it easier for the concentration of the gas 504 to be calibrated to a more accurate concentration than when the concentration is calibrated based on the calibration reliability R1 that is not weighted. The calibration unit 24 may calibrate the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the highest calibration reliability R1 among the calibration reliability R11 to R1n.

[0150] 10 is a flowchart showing an example of a gas sensor calibration method according to an embodiment of the present invention. The gas sensor calibration method according to an embodiment of the present invention will be described using the gas sensor system 400 shown in FIGS. 4 and 5 as an example.

[0151] The transmission step S100 is a step in which the transmitter 13 transmits the first calibration information Ic'. The first calibration information Ic' is calibration information for calibrating the concentration of the gas 503 (see FIG. 1) in the measurement target 501 (see FIG. 1), which is calculated based on the output of the first gas sensor 11.

[0152] The receiving step S102 is a step in which the receiving unit 20 receives the first calibration information Ic' transmitted in the transmitting step S100. The calibrating step S104 is a step in which the calibrating unit 24 calibrates the concentration of the gas 504 (see FIG. 1) in the measurement target 502 (see FIG. 1) calculated based on the output of the second gas sensor 21, based on the first calibration information Ic' received in the receiving step S102.

[0153] The transmitting step S100 may be a step in which the transmitting unit 13 further transmits reliability information Ir1 indicating the calibration reliability R1 of the first gas sensor device 100. The receiving step S102 may be a step in which the receiving unit 20 further receives the reliability information Ir1 transmitted in the transmitting step S100.

[0154] The calibration step S104 may be a step in which the calibration unit 24 calibrates the gas concentration of the gas 504 in the measurement target 502, which is calculated based on the output of the second gas sensor 21, based on the first calibration information Ic' and the reliability information Ir1. The calibration step S104 may be a step in which the calibration unit 24 calibrates the concentration of the gas 504, which is calculated based on the output of the second gas sensor 21, based on the first calibration information Ic' received in the receiving step S102, in accordance with the calibration reliability R1.

[0155] The calibration step S104 may be a step in which, when the calibration reliability R2 of the self-calibration of the second gas sensor device 200 is equal to or less than a predetermined second threshold value Rth2 and the calibration reliability R1 exceeds the first threshold value Rth1, the calibration unit 24 calibrates the concentration of the gas 504 of the measurement object 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received in the receiving step S102.

[0156] The calibration step S104 may be a step in which the calibration unit 24 compares the calibration reliability R1 and the calibration reliability R2 received in the receiving step S102, and if the calibration reliability R1 is higher than the calibration reliability R2, calibrates the concentration of the gas 504 in the measurement object 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received in the receiving step S102. The calibration step S104 may be a step in which the calibration unit 24 calibrates the gas concentration in the measurement object 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' when the calibration reliability R1 of the first gas sensor device 100 received in the receiving step S102 is higher than the reference calibration reliability Cs.

[0157] Fig. 11 shows an example of details of the calibration step S104 in Fig. 10. The AD conversion step S90 is a step in which the AD conversion unit 124 converts the analog signal output of the second gas sensor 21 into a digital signal. The calculation step S92 is a step in which the calculation unit 120 calculates the concentration of the gas 504 based on the digital signal converted in the AD conversion step S90. The storage step S94 is a step in which the storage unit 112 stores the concentration of the gas 504 calculated in the calculation step S92. The storage step S94 may be a step in which a correlation Cr' between the concentration of the gas 504 calculated in the calculation step S92 and the first calibration information Ic' is stored.

[0158] The calculation step S96 is a step in which the calculation unit 120 calculates second calibration information Ic'' based on the first calibration information Ic' received in the receiving step 102 and the correlation Cr' stored in the storage step S94. The calibration step S98 using a digital signal is a step in which the calibration unit 24 (see FIG. 4) calibrates the concentration of the gas 504 (see FIG. 1) in the measurement target 502 (see FIG. 1) calculated based on the output of the second gas sensor 21, using the second calibration information Ic'' in the digital signal. Note that the calculation step S96 may be a step in which the calibration unit 24 calculates and calibrates the concentration of the gas 504 based on the digital signal converted in the AD conversion step S90 and the first calibration information Ic' received in the receiving step S102.

[0159] When a living body 90 (see FIG. 1) having the first gas sensor device 100 moves from a measurement target 501 to a measurement target 502, the measurement target 502 in which the concentration of a gas 504 is calculated based on the output of the first gas sensor 11 and the measurement target 502 in which the concentration of a gas 504 is calculated based on the output of the second gas sensor 21 may be the same. The measurement targets 502 being the same may mean that the type of the measurement target gas of the first gas sensor device 100 and the type of the measurement target gas of the second gas sensor device 200 are the same in the measurement target 502. In this example, the second gas sensor device 200 is disposed in the internal space 508.

[0160] The measurement target 502 being the same may mean that the first gas sensor 11 and the second gas sensor 21 share the same space (in this example, the internal space 508 (see FIG. 1)). The same space may mean at least one of the following: the temperature or humidity in the space is the same, the short-distance wireless (such as wifi (registered trademark)) ID is the same, and, when the first gas sensor device 100 and the second gas sensor device 200 are mobile terminals, the amplitude and frequency of the sound waves acquired by the mobile terminals are the same.

[0161] The storage unit 122 may store the reference reliability information Cs. The storage step S94 may include an update step S941 in which, when the calibration reliability R1 of the first gas sensor device 100 received in the reception step S102 is higher than the reference calibration reliability Cs, the storage unit 122 updates the reference calibration reliability Cs based on the received calibration reliability R1. In the storage step S94, the storage unit 122 may store the updated reference calibration reliability Cs. The calibration step S104 may be a step in which the calibration unit 24 calibrates the gas concentration of the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the updated reference reliability Cs.

[0162] The updating step S941 may be a step in which, when the calibration reliability R1 of the first gas sensor device 100 received in the receiving step S102 is higher than the reference calibration reliability Cs, the storage unit 122 updates the reference calibration reliability Cs to the calibration reliability R1. When the calibration reliability R1 is lower than the reference calibration reliability Cs in the storing step S94, the storage unit 122 does not need to update the reference calibration reliability Cs.

[0163] The reference reliability information Cs stored in the storage step S94 may be the reference reliability information Cs updated based on the calibration reliability R1, or may be the calibration reliability R2. The calibration reliability R2 may include the calibration reliability R2 of the self-calibration of the second gas sensor device 200 and the calibration reliability R2 in the case where the second gas sensor device 200 is calibrated by another sensor.

[0164] Fig. 12 is a flowchart showing another example of the gas sensor calibration method according to an embodiment of the present invention. The gas sensor calibration method of this example differs from the gas sensor calibration method shown in Fig. 10 in that it further includes a storage step S1031 and a position information acquisition step S1032. The gas sensor calibration method of this example will be described using the gas sensor system 400 shown in Figs. 4 and 5 as an example.

[0165] The storage step S1031 is a step in which the storage unit 122 stores the reliability information Ir1 received in the receiving step S102. The calibration step S104 is a step in which the calibration unit 24 compares the reliability information Ir1 received in the receiving step S102 with the reliability information Ir1 stored in the storage step 1031, and when the reliability information Ir1 received in the receiving step S102 is higher than the reliability information Ir1 stored in the storage step 1031, calibrates the concentration of the gas 504 (see FIG. 1) of the measurement target 502 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received in the receiving step S102. The calibration step S104 may be performed after the storage step S1031.

[0166] The storing step S1031 may include an updating step S1033 in which, when the calibration reliability R1 of the first gas sensor device 100 received in the receiving step S102 is higher than the reference calibration reliability Cs, the storage unit 122 updates the reference calibration reliability Cs based on the received calibration reliability R1. In the storing step S1031, the storage unit 122 may store the updated reference calibration reliability Cs. The calibrating step S104 may be a step in which the calibration unit 24 calibrates the gas concentration of the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the updated reference reliability Cs.

[0167] The updating step S1033 may be a step in which, when the calibration reliability R1 of the first gas sensor device 100 received in the receiving step S102 is higher than the reference calibration reliability Cs, the storage unit 122 updates the reference calibration reliability Cs to the calibration reliability R1. When the calibration reliability R1 is lower than the reference calibration reliability Cs in the storing step S1031, the storage unit 122 does not need to update the reference calibration reliability Cs.

[0168] The reference reliability information Cs stored in the storage step S1031 may be the reference reliability information Cs updated based on the calibration reliability R1, or may be the calibration reliability R2. The calibration reliability R2 may include the calibration reliability R2 of the self-calibration of the second gas sensor apparatus 200 and the calibration reliability R2 in the case where the second gas sensor apparatus 200 is calibrated by another sensor.

[0169] The position information acquisition step S1032 is a step in which the position information acquisition unit 26 acquires position information Ip2 of the second gas sensor apparatus 200. In the position information acquisition step S1032, the position information acquisition unit 16 may acquire position information Ip1 of the first gas sensor apparatus 100. The position information acquisition unit 16 and the position information acquisition unit 26 are, for example, a global positioning system (GPS (Global Positioning System)).

[0170] The reliability information Ir1 may include the position information Ip1. As described above, the distance d is the distance between the position of the first gas sensor device 100 and the position of the second gas sensor device 200 acquired by the position information acquisition unit 26. The calibration step S104 may be a step in which the calibration unit 24 calibrates the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the distance d and the first calibration information Ic'. The calibration step S104 may be a step in which the calibration unit 24 calibrates the concentration of the gas 504 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received in the receiving step S102 in accordance with the distance d. The calibration step S104 may be performed after the position information acquisition step S1032.

[0171] As described above, the distance dp2 is a predetermined distance between the position of the first gas sensor 11 and the position of the second gas sensor 21. The calibration step S104 may be a step in which the calibration unit 24 calibrates the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 when the distance d is less than the distance dp2. In the calibration step S104, when the distance d is equal to or greater than the distance dp2, the calibration unit 24 does not need to calibrate the concentration of the gas 504, and may calibrate it based on the second calibration information Ic''. The second calibration information Ic'' is calibration information for calibrating the concentration of the gas 504 (see FIG. 7) of the measurement target 502 (see FIG. 7) calculated based on the output of the second gas sensor 21.

[0172] The order of the storage step S1031 and the position information acquisition step S1032 may be reversed. That is, the position information acquisition step S1032 may be performed after the reception step S102, and the storage step S1031 may be performed after the position information acquisition step S1032. When the order of the storage step S1031 and the position information acquisition step S1032 is reversed, the storage unit 122 may store the position information Ip2, or may store the position information Ip2 and the position information Ip1.

[0173] The receiving step S102 may be a step in which the receiving unit 20 receives the first calibration information Ic' for each of the multiple first gas sensor devices 100. The calibrating step S104 may be a step in which the calibrating unit 24 calibrates the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21, based on each of the first calibration information Ic' received in the receiving step 102. In this example, in the calibrating step S104, the calibrating unit 24 calibrates the concentration of the gas 504 based on the first calibration information Ic'1 to first calibration information Ic'n. This makes it easier to calibrate the concentration of the gas 504 to a more accurate concentration than when it is calibrated based on one piece of first calibration information Ic'.

[0174] The transmitting step S100 may be a step in which the transmitting unit 13 further transmits the reliability information Ir1 of each of the multiple first gas sensor devices 100. The receiving step S102 may be a step in which the receiving unit 20 further receives the reliability information Ir1 transmitted in the transmitting step S100. The calibrating step S104 may be a step in which the calibrating unit 24 weights the calibration reliabilities R11 to R1n and calibrates the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the weighted calibration reliability R1.

[0175] The storing step S1031 may be a step of storing the reliability information Ir1 received in the receiving step S102 for each of the plurality of first gas sensor devices 100. The calculating step S96 shown in Fig. 11 may be a step of the calculating unit 120 calculating weightings for the calibration reliabilities R11 to R1n based on the reliability information Ir1 stored in the storing step S1031, and calculating the second calibration information Ic'' by applying the weightings to the calibration reliabilities R11 to R1n.

[0176] 11 may be a step in which the calibration unit 24 (see FIGS. 4 and 5) calibrates the concentration of the gas 504 (see FIG. 1) in the measurement target 502 (see FIG. 1) calculated based on the output of the second gas sensor 21 using a digital signal of the weighted second calibration information Ic″. This makes it easier for the concentration of the gas 504 to be calibrated to a more accurate concentration than when it is calibrated based on the second calibration information Ic″ that is not weighted by the calibration reliability R1.

[0177] The calibration step S104 may be a step in which the calibration unit 24 calibrates the concentration of the gas 504 (see FIG. 1) calculated based on the output of the second gas sensor 21 based on the highest calibration reliability R1 among the calibration reliability R11 to calibration reliability R1n. In the calibration step S104, the calibration unit 24 may calibrate the concentration of the gas 504 by weighting the highest calibration reliability R1 as 1 and the other calibration reliability R1 as zero.

[0178] 13 is a flowchart showing an example of a gas sensor calibration method according to an embodiment of the present invention. The gas sensor calibration method according to an embodiment of the present invention will be described using the gas sensor device 150 shown in FIGS. 8 and 9 as an example.

[0179] The transmitting step S200 is a step in which the transmitting unit 13 transmits the first calibration information Ic' to the second gas sensor apparatus 250. The first calibration information Ic' is calibration information for calibrating the concentration of the gas 503 (see FIG. 7) in the measurement target 501 (see FIG. 7), which is calculated based on the output of the first gas sensor 11. The transmitting step S200 may be a step in which the transmitting unit 13 further transmits reliability information Ir1 indicating the calibration reliability R1 of the first gas sensor apparatus 150 to the second gas sensor apparatus 250.

[0180] 14 is a flowchart showing an example of a gas sensor calibration method according to an embodiment of the present invention. The gas sensor calibration method according to an embodiment of the present invention will be described using the gas sensor device 250 shown in FIGS. 8 and 9 as an example.

[0181] The receiving step S302 is a step in which the receiving unit 20 receives the first calibration information Ic' of the first gas sensor device 150. The calibrating step S304 is a step in which the calibrating unit 24 calibrates the concentration of the gas 504 (see FIG. 7) of the measurement target 502 (see FIG. 7), which is calculated based on the output of the second gas sensor 21, based on the first calibration information Ic' received in the receiving step S102.

[0182] 13 and 14, when a living body 90 (see FIG. 7) having the first gas sensor device 150 moves from a measurement target 501 to a measurement target 502, the measurement target 502 in which the concentration of a gas 504 is calculated based on the output of the first gas sensor 11 and the measurement target 502 in which the concentration of a gas 504 is calculated based on the output of the second gas sensor 21 may be the same. As described above, the measurement targets 502 being the same means that the type of the measurement target gas of the first gas sensor device 150 and the type of the measurement target gas of the second gas sensor device 250 are the same in the measurement target 502. In this example, the second gas sensor device 250 is disposed in the internal space 508.

[0183] As described above, the measurement target 502 being the same may mean that the first gas sensor 11 and the second gas sensor 21 share the same space (in this example, the internal space 508 (see FIG. 7)). The same space may mean at least one of the following: the temperature or humidity in the space is the same, the short-distance wireless (such as wifi (registered trademark)) ID is the same, and, when the first gas sensor device 150 and the second gas sensor device 250 are mobile terminals, the amplitude and frequency of sound waves acquired by the mobile terminals are the same.

[0184] The receiving step S302 may be a step in which the receiving unit 20 further receives reliability information Ir1 indicating the calibration reliability R1. The calibrating step S304 may be a step in which the calibrating unit 24 calibrates the gas concentration of the gas 504 in the measurement target 502, which is calculated based on the output of the second gas sensor 21, based on the first calibration information Ic' and the reliability information Ir1. The calibrating step S304 may be a step in which the calibrating unit 24 calibrates the concentration of the gas 504, which is calculated based on the output of the second gas sensor 21, based on the first calibration information Ic' received in the receiving step S302 in accordance with the calibration reliability R1.

[0185] The calibration step S304 may be a step in which, when the calibration reliability R2 of the self-calibration of the second gas sensor device 250 is equal to or less than a predetermined second threshold value Rth2 and the calibration reliability R1 exceeds the first threshold value Rth1, the calibration unit 24 calibrates the concentration of the gas 504 of the measurement object 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received in the receiving step S302.

[0186] The calibration step S304 may be a step in which the calibration unit 24 compares the calibration reliability R1 and the calibration reliability R2 of the first gas sensor device 150, and if the calibration reliability R1 is higher than the calibration reliability R2, calibrates the concentration of the gas 504 in the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received in the receiving step S302. The calibration step S304 may be a step in which the calibration unit 24 calibrates the gas concentration in the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' when the calibration reliability R1 of the first gas sensor device 150 received in the receiving step S302 is higher than the reference calibration reliability Cs.

[0187] Fig. 15 shows an example of details of the calibration step S304 in Fig. 14. The AD conversion step S190 is a step in which the AD conversion unit 124 converts the analog signal output of the second gas sensor 21 into a digital signal. The calculation step S192 is a step in which the calculation unit 120 calculates the concentration of the gas 504 based on the digital signal converted in the AD conversion step S190. The storage step S194 is a step in which the storage unit 112 stores the concentration of the gas 504 calculated in the calculation step S192. The storage step S194 may be a step in which a correlation Cr' between the concentration of the gas 504 calculated in the calculation step S192 and the first calibration information Ic' is stored.

[0188] The calculation step S196 is a step in which the calculation unit 120 calculates second calibration information Ic″ based on the first calibration information Ic′ received in the receiving step 302 and the correlation Cr′ stored in the storing step S194. The calibration step S198 using a digital signal is a step in which the calibration unit 24 (see FIG. 4) calibrates the concentration of the gas 504 (see FIG. 7) in the measurement target 502 (see FIG. 7) calculated based on the output of the second gas sensor 21, using the second calibration information Ic″ in the digital signal. Note that the calculation step S196 may be a step in which the calibration unit 24 calculates and calibrates the concentration of the gas 504 based on the digital signal converted in the AD conversion step S190 and the second calibration information Ic″ received in the receiving step S302.

[0189] The storage unit 122 may store the reference reliability information Cs. The storage step S194 may include an update step S1941 in which, when the calibration reliability R1 of the first gas sensor device 150 received in the reception step S302 is higher than the reference calibration reliability Cs, the storage unit 122 updates the reference calibration reliability Cs based on the received calibration reliability R1. In the storage step S194, the storage unit 122 may store the updated reference calibration reliability Cs. The calibration step S304 may be a step in which the calibration unit 24 calibrates the gas concentration of the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the updated reference reliability Cs.

[0190] The updating step S1941 may be a step in which, when the calibration reliability R1 of the first gas sensor device 150 received in the receiving step S302 is higher than the reference calibration reliability Cs, the storage unit 122 updates the reference calibration reliability Cs to the calibration reliability R1. When the calibration reliability R1 is lower than the reference calibration reliability Cs in the storing step S194, the storage unit 122 does not need to update the reference calibration reliability Cs.

[0191] The reference reliability information Cs stored in the storage step S194 may be the reference reliability information Cs updated based on the calibration reliability R1, or may be the calibration reliability R2. The calibration reliability R2 may include the calibration reliability R2 of the self-calibration of the second gas sensor device 250 and the calibration reliability R2 in the case where the second gas sensor device 250 is calibrated by another sensor.

[0192] Fig. 16 is a flowchart showing another example of the gas sensor calibration method according to an embodiment of the present invention. The gas sensor calibration method of this example differs from the gas sensor calibration method shown in Fig. 14 in that it further includes a storage step S3031 and a position information acquisition step S3032. The gas sensor calibration method of this example will be described taking the gas sensor device 250 shown in Figs. 8 and 9 as an example.

[0193] The storage step S3031 is a step in which the storage unit 122 stores the reliability information Ir1 received in the receiving step S302. The calibration step S304 is a step in which the calibration unit 24 compares the reliability information Ir1 received in the receiving step S302 with the reliability information Ir1 stored in the storage step 3031, and when the reliability information Ir1 received in the receiving step S302 is higher than the reliability information Ir1 stored in the storage step 3031, calibrates the concentration of the gas 504 (see FIG. 7) of the measurement target 502 (see FIG. 7) calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received in the receiving step S302. The calibration step S304 may be performed after the storage step S3031.

[0194] The storing step S3031 may include an updating step S3033 in which, when the calibration reliability R1 of the first gas sensor device 150 received in the receiving step S102 is higher than the reference calibration reliability Cs, the storage unit 122 updates the reference calibration reliability Cs based on the received calibration reliability R1. In the storing step S3031, the storage unit 122 may store the updated reference calibration reliability Cs. The calibrating step S304 may be a step in which the calibration unit 24 calibrates the gas concentration of the measurement target 502 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' in accordance with the updated reference reliability Cs.

[0195] The updating step S3033 may be a step in which, when the calibration reliability R1 of the first gas sensor device 150 received in the receiving step S302 is higher than the reference calibration reliability Cs, the storage unit 122 updates the reference calibration reliability Cs to the calibration reliability R1. When the calibration reliability R1 is lower than the reference calibration reliability Cs in the storing step S3031, the storage unit 122 does not need to update the reference calibration reliability Cs.

[0196] The reference reliability information Cs stored in the storage step S3031 may be the reference reliability information Cs updated based on the calibration reliability R1, or may be the calibration reliability R2. The calibration reliability R2 may include the calibration reliability R2 of the self-calibration of the second gas sensor device 250 and the calibration reliability R2 in the case where the second gas sensor device 250 is calibrated by another sensor.

[0197] The position information acquisition step S3032 is a step in which the position information acquisition unit 26 acquires the position information Ip2 of the second gas sensor device 200. In the position information acquisition step S3032, the position information acquisition unit 16 may acquire the position information Ip1 of the first gas sensor device 100. The position information acquisition unit 16 and the position information acquisition unit 26 are, for example, a global positioning system (GPS (Global Positioning System)).

[0198] The reliability information Ir1 may include the position information Ip1. As described above, the distance d is the distance between the position of the first gas sensor device 100 and the position of the second gas sensor device 200 acquired by the position information acquisition unit 26. The calibration step S304 may be a step in which the calibration unit 24 calibrates the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21 based on the distance d and the first calibration information Ic'. The calibration step S304 may be a step in which the calibration unit 24 calibrates the concentration of the gas 504 calculated based on the output of the second gas sensor 21 based on the first calibration information Ic' received in the receiving step S302 in accordance with the distance d. The calibration step S304 may be performed after the position information acquisition step S3032.

[0199] As described above, the distance dp2 is a predetermined distance between the position of the first gas sensor 11 and the position of the second gas sensor 21. The calibration step S304 may be a step in which, when the distance d is less than the distance dp2, the calibration unit 24 calibrates the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21. In the calibration step S304, when the distance d is equal to or greater than the distance dp2, the calibration unit 24 does not need to calibrate the concentration of the gas 504.

[0200] The order of the storage step S3031 and the position information acquisition step S3032 may be reversed. That is, the position information acquisition step S3032 may be performed after the reception step S302, and the storage step S3031 may be performed after the position information acquisition step S3032. When the order of the storage step S3031 and the position information acquisition step S3032 is reversed, the storage unit 122 may store the position information Ip2, or may store the position information Ip2 and the position information Ip1.

[0201] The receiving step S302 may be a step in which the receiving unit 20 receives the first calibration information Ic' of each of the plurality of first gas sensor devices 100. The calibrating step S304 may be a step in which the calibrating unit 24 calibrates the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21, based on each of the first calibration information Ic' received in the receiving step 302. In this example, in the calibrating step S304, the calibrating unit 24 calibrates the concentration of the gas 504 based on the first calibration information Ic'1 to Ic'n. This makes it easier for the concentration of the gas 504 to be calibrated to a more accurate concentration than when it is calibrated based on one piece of first calibration information Ic'.

[0202] The receiving step S302 may be a step in which the receiving unit 20 further receives the reliability information Ir1 of each of the plurality of first gas sensor devices 100. The calibrating step S304 may be a step in which the calibrating unit 24 weights the calibration reliabilities R11 to R1n, and calibrates the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21, based on the weighted calibration reliability R1.

[0203] The storing step S3031 may be a step of storing the reliability information Ir1 received in the receiving step S302 for each of the plurality of first gas sensor devices 100. The calculating step S196 shown in Fig. 15 may be a step of the calculating unit 120 calculating weightings for the calibration reliabilities R11 to R1n based on the reliability information Ir1 stored in the storing step S3031, and calculating the second calibration information Ic'' by applying the weightings to the calibration reliabilities R11 to R1n.

[0204] 15, the calibration step S198 using a digital signal may be a step in which the calibration unit 24 (see FIGS. 8 and 9) calibrates the concentration of the gas 504 (see FIG. 7) in the measurement target 502 (see FIG. 7) calculated based on the output of the second gas sensor 21 using a digital signal of the weighted second calibration information Ic″. This makes it easier for the concentration of the gas 504 to be calibrated to a more accurate concentration than when it is calibrated based on the second calibration information Ic″ that is not weighted by the calibration reliability R1.

[0205] The calibration step S304 may be a step in which the calibration unit 24 calibrates the concentration of the gas 504 (see FIG. 7) calculated based on the output of the second gas sensor 21 based on the highest calibration reliability R1 among the calibration reliability R11 to calibration reliability R1n. In the calibration step S304, the calibration unit 24 may calibrate the concentration of the gas 504 by weighting the highest calibration reliability R1 as 1 and the other calibration reliability R1 as zero.

[0206] Various embodiments of the invention may be described with reference to flowcharts and block diagrams. In various embodiments of the invention, blocks may represent (1) process steps where operations are performed or (2) sections of apparatus responsible for performing the operations.

[0207] Certain steps may be performed by dedicated circuitry, programmable circuitry, or a processor. Certain sections may be implemented by dedicated circuitry, programmable circuitry, or a processor. The programmable circuitry and the processor may be provided with computer readable instructions. The computer readable instructions may be stored on a computer readable medium.

[0208] The dedicated circuitry may include digital and / or analog hardware circuits. The dedicated circuitry may include integrated circuits (ICs) and / or discrete circuits. The programmable circuitry may include hardware circuits for logical AND, OR, XOR, NAND, NOR, or other logical operations. The programmable circuitry may include reconfigurable hardware circuits including flip-flops, registers, memory elements such as field programmable gate arrays (FPGAs), programmable logic arrays (PLAs), and the like.

[0209] The computer readable medium may include any tangible device capable of storing instructions that are executed by a suitable device, and by the inclusion of such a tangible device, the computer readable medium having instructions stored thereon comprises an article of manufacture that includes instructions that can be executed to create means for performing the operations specified in the flowcharts or block diagrams.

[0210] The computer readable medium may be, for example, an electronic storage medium, a magnetic storage medium, an optical storage medium, an electromagnetic storage medium, a semiconductor storage medium, etc. More specifically, the computer readable medium may be, for example, a floppy disk, a diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an electrically erasable programmable read-only memory (EEPROM), a static random access memory (SRAM), a compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a Blu-ray (RTM) disk, a memory stick, an integrated circuit card, etc.

[0211] The computer readable instructions may include any of assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state setting data, source code and object code. The source code and the object code may be written in any combination of one or more programming languages, including object oriented programming languages ​​and conventional procedural programming languages. The object oriented programming language may be, for example, Smalltalk, JAVA, C++, etc. The procedural programming language may be, for example, the "C" programming language.

[0212] The computer readable instructions may be provided to a processor or programmable circuitry of a general purpose computer, special purpose computer, or other programmable data processing apparatus locally or over a wide area network (WAN) such as a local area network (LAN), the Internet, etc. The processor or programmable circuitry of the general purpose computer, special purpose computer, or other programmable data processing apparatus may execute the computer readable instructions to create means for performing the operations specified in the flowcharts shown in Figures 10-16 or the block diagrams shown in Figures 2-5, 8, or 9. The processor may be, for example, a computer processor, processing unit, microprocessor, digital signal processor, controller, microcontroller, etc.

[0213] FIG. 17 is a diagram showing an example of a computer 2200 in which the gas sensor system 400, the gas sensor device 150, or the gas sensor device 250 according to an embodiment of the present invention may be embodied in whole or in part. A program installed in the computer 2200 may cause the computer 2200 to perform operations associated with the gas sensor device 150 or the gas sensor device 250 according to an embodiment of the present invention, or to function as one or more sections of the gas sensor device 150 or the gas sensor device 250, or to execute the operations or one or more sections, or to execute each step (see FIGS. 10 to 16) according to the prediction method of the present invention. The program may be executed by the CPU 2212 to cause the computer 2200 to execute specific operations associated with some or all of the blocks in the flowcharts (FIGS. 10 to 16) and block diagrams (FIGS. 2 to 5, 8, or 9) described herein.

[0214] A computer 2200 according to an embodiment of the present invention includes a CPU 2212, a RAM 2214, a graphic controller 2216, and a display device 2218. The CPU 2212, the RAM 2214, the graphic controller 2216, and the display device 2218 are connected to each other by a host controller 2210. The computer 2200 further includes input / output units such as a communication interface 2222, a hard disk drive 2224, a DVD-ROM drive 2226, and an IC card drive. The communication interface 2222, the hard disk drive 2224, the DVD-ROM drive 2226, and the IC card drive are connected to the host controller 2210 via an input / output controller 2220. The computer further includes legacy input / output units such as a ROM 2230 and a keyboard 2242. The ROM 2230, the keyboard 2242, and the like are connected to the input / output controller 2220 via an input / output chip 2240.

[0215] The CPU 2212 controls each unit by operating according to programs stored in the ROM 2230 and the RAM 2214. The graphic controller 2216 acquires image data generated by the CPU 2212 into a frame buffer or the like provided in the RAM 2214 or into the RAM 2214, thereby causing the image data to be displayed on the display device 2218.

[0216] The communication interface 2222 communicates with other electronic devices via a network. The hard disk drive 2224 stores programs and data used by the CPU 2212 in the computer 2200. The DVD-ROM drive 2226 reads programs or data from the DVD-ROM 2201 and provides the read programs or data to the hard disk drive 2224 via the RAM 2214. The IC card drive reads programs and data from an IC card or writes programs and data to an IC card.

[0217] The ROM 2230 stores a boot program or the like that is executed by the computer 2200 upon activation, or a program that depends on the hardware of the computer 2200. The input / output chip 2240 may connect various input / output units to the input / output controller 2220 via a parallel port, a serial port, a keyboard port, a mouse port, or the like.

[0218] The programs are provided by a computer-readable medium such as a DVD-ROM 2201 or an IC card. The programs are read from the computer-readable medium, installed in the hard disk drive 2224, the RAM 2214, or the ROM 2230, which are also examples of computer-readable media, and executed by the CPU 2212. Information processing described in these programs is read by the computer 2200, and brings about cooperation between the programs and the various types of hardware resources described above. An apparatus or method may be constructed by implementing information manipulation or processing according to the use of the computer 2200.

[0219] For example, when communication is performed between the computer 2200 and an external device, the CPU 2212 may execute a communication program loaded in the RAM 2214 and instruct the communication interface 2222 to perform communication processing based on the processing described in the communication program. Under the control of the CPU 2212, the communication interface 2222 reads transmission data stored in a transmission buffer processing area provided in the RAM 2214, the hard disk drive 2224, the DVD-ROM 2201, or a recording medium such as an IC card, and transmits the read transmission data to a network, or writes reception data received from the network to a reception buffer processing area or the like provided on the recording medium.

[0220] The CPU 2212 may cause all or a necessary portion of a file or database stored in an external recording medium such as the hard disk drive 2224, the DVD-ROM drive 2226 (DVD-ROM 2201), an IC card, etc. to be read into the RAM 2214. The CPU 2212 may perform various types of processing on the data on the RAM 2214. The CPU 2212 may then write back the processed data to the external recording medium.

[0221] Various types of information, such as various types of programs, data, tables, and databases, may be stored in the recording medium and processed. The CPU 2212 may execute various types of processing on the data read from the RAM 2214, including various types of operations, information processing, conditional decisions, conditional branches, unconditional branches, information searches or replacements, etc., specified by the instruction sequences of the programs described in this disclosure. The CPU 2212 may write back the results to the RAM 2214.

[0222] CPU2212 may search for information in a file, database, etc. in the recording medium. For example, when a plurality of entries each having an attribute value of a first attribute associated with an attribute value of a second attribute are stored in the recording medium, CPU2212 may search for an entry that matches a condition in which the attribute value of the first attribute is specified from among the plurality of entries, read the attribute value of the second attribute stored in the entry, and obtain the attribute value of the second attribute associated with the first attribute that satisfies a predetermined condition by reading the second attribute value.

[0223] The above-mentioned program or software module may be stored on the computer 2200 or in a computer-readable medium of the computer 2200. A recording medium such as a hard disk or a RAM provided in a server system connected to a dedicated communication network or the Internet can be used as the computer-readable medium. The program may be provided to the computer 2200 by the recording medium.

[0224] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the description of the claims that such modifications and improvements can also be included in the technical scope of the present invention.

[0225] It should be noted that the order of execution of each process, such as operations, procedures, steps, and stages, in the devices, systems, programs, and methods shown in the claims, specifications, and drawings is not specifically stated as "before," "prior to," etc., and may be realized in any order unless the output of a previous process is used in a later process. Even if the operational flow in the claims, specifications, and drawings is explained using "first," "next," etc. for convenience, it does not mean that it is essential to perform the process in this order. [Item 1] a first gas sensor device having a transmitter for transmitting first calibration information for calibrating a concentration of a gas to be measured, the calibration information being calculated based on an output of the first gas sensor; a second gas sensor device including a receiving unit that receives the first calibration information transmitted by the transmitting unit, and a calibration unit that calibrates a gas concentration of a measurement target calculated based on an output of a second gas sensor, based on the first calibration information received by the receiving unit; A gas sensor system comprising: [Item 2] 2. The gas sensor system according to item 1, wherein the measurement target, the gas concentration of which is calculated based on the output of the first gas sensor, and the measurement target, the gas concentration of which is calculated based on the output of the second gas sensor, are the same. [Item 3] the first gas sensor device has the first gas sensor, The first gas sensor device is a mobile terminal. 3. The gas sensor system according to item 1 or 2. [Item 4] 4. The gas sensor system according to item 3, wherein the second gas sensor device is disposed in an internal space of the measurement target, the gas concentration of which is calculated based on an output of the second gas sensor. [Item 5] the second gas sensor device has the second gas sensor, and the second gas sensor device is a mobile terminal. 5. A gas sensor system according to any one of items 1 to 4. [Item 6] the transmitting unit further transmits reliability information indicating a calibration reliability of the first gas sensor device; The receiving unit further receives the reliability information, the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor in accordance with a calibration reliability of the first gas sensor device, based on the received first calibration information. 6. A gas sensor system according to any one of items 1 to 5. [Item 7] 7. The gas sensor system according to item 6, wherein, when the reliability of the self-calibration of the second gas sensor device is equal to or lower than a predetermined second threshold and the calibration reliability of the first gas sensor device exceeds a first threshold, the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the received first calibration information. [Item 8] 8. The gas sensor system according to claim 6, wherein the calibration unit compares the calibration reliability of the first gas sensor device received by the receiving unit with the calibration reliability of the second gas sensor device, and when the calibration reliability of the first gas sensor device is higher than the calibration reliability of the second gas sensor device, calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the received first calibration information. [Item 9] the second gas sensor device further includes a storage unit configured to store the reliability information received by the receiving unit, the calibration unit compares the calibration reliability of the first gas sensor device received by the receiving unit with the calibration reliability of the first gas sensor device stored in the memory unit, and when the calibration reliability of the first gas sensor device received by the receiving unit is higher than the calibration reliability stored in the memory unit, calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the received first calibration information. 9. The gas sensor system according to any one of items 6 to 8. [Item 10] the second gas sensor device further includes a position information acquiring unit that acquires position information of the second gas sensor device, the reliability information includes position information of the first gas sensor device, the calibration unit calibrates the gas concentration of the measurement target, which is calculated based on an output of the second gas sensor, based on the received first calibration information in accordance with a distance between a position of the first gas sensor device and a position of the second gas sensor device acquired by the position information acquisition unit. 10. The gas sensor system according to any one of items 6 to 9. [Item 11] 11. The gas sensor system according to item 10, wherein the calibration unit calibrates the gas concentration of the measurement target, which is calculated based on the output of the second gas sensor, based on the received first calibration information, when the distance is less than a predetermined distance. [Item 12] A plurality of the first gas sensor devices are provided, the receiving unit receives first calibration information for each of the plurality of first gas sensor devices; the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor, based on the first calibration information of each of the plurality of first gas sensor devices. 12. The gas sensor system according to any one of items 6 to 11. [Item 13] the transmitting unit of each of the plurality of first gas sensor devices transmits the reliability information of the respective first gas sensor devices; the receiving unit receives the reliability information of each of the plurality of first gas sensor devices; the calibration unit weights the calibration reliability of each of the plurality of first gas sensor devices, and calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the weighted calibration reliability. Item 13. The gas sensor system according to item 12. [Item 14] Item 14. The gas sensor system according to item 13, wherein the calibration unit calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on the highest calibration reliability among the calibration reliability of each of the plurality of first gas sensor devices. [Item 15] a transmitter for transmitting the first calibration information to the second gas sensor device; The first calibration information is calibration information for calibrating a gas concentration of a measurement target calculated based on an output of the first gas sensor. Gas sensor device. [Item 16] the second gas sensor device has a second gas sensor; Item 16. The gas sensor device according to item 15, wherein the measurement target, the gas concentration of which is calculated based on the output of the first gas sensor, and the measurement target, the gas concentration of which is calculated based on the output of the second gas sensor, are the same. [Item 17] Item 17. The gas sensor device according to item 16, wherein the second gas sensor is provided in a mobile terminal. [Item 18] the first gas sensor is provided in a first gas sensor device, 18. The gas sensor device according to claim 15, wherein the transmission unit further transmits reliability information indicating a calibration reliability of the first gas sensor device to the second gas sensor device. [Item 19] a receiving unit for receiving first calibration information of the first gas sensor device; a calibration unit that calibrates a gas concentration of a measurement target calculated based on an output of the second gas sensor, based on the first calibration information received by the receiving unit; A gas sensor device comprising: [Item 20] the first gas sensor device has a first gas sensor, 20. The gas sensor device according to item 19, wherein a measurement target whose gas concentration is calculated based on the output of the first gas sensor and a measurement target whose gas concentration is calculated based on the output of the second gas sensor are the same. [Item 21] Item 21. The gas sensor device according to item 20, wherein the first gas sensor is provided in a mobile terminal. [Item 22] Item 22. The gas sensor device according to item 21, wherein the second gas sensor is disposed in an internal space of the measurement target, the gas concentration of which is calculated based on an output of the second gas sensor. [Item 23] the receiving unit further receives reliability information indicating a calibration reliability of the first gas sensor device; the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor in accordance with a calibration reliability of the first gas sensor device, based on the received first calibration information. 23. The gas sensor device according to any one of items 19 to 22. [Item 24] the second gas sensor is provided in a second gas sensor device, 24. The gas sensor device according to item 23, wherein, when a reliability of self-calibration of the second gas sensor device is equal to or lower than a predetermined second threshold value and a calibration reliability of the first gas sensor device exceeds a first threshold value, the calibration unit calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on the received first calibration information. [Item 25] 25. The gas sensor device according to item 24, wherein the calibration unit compares the calibration reliability of the first gas sensor device received by the receiving unit with the calibration reliability of the second gas sensor device, and when the calibration reliability of the first gas sensor device is higher than the calibration reliability of the second gas sensor device, calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the received first calibration information. [Item 26] a storage unit configured to store the reliability information received by the receiving unit, the calibration unit compares the calibration reliability of the first gas sensor device received by the receiving unit with the calibration reliability of the first gas sensor device stored in the memory unit, and when the calibration reliability of the first gas sensor device received by the receiving unit is higher than the calibration reliability stored in the memory unit, calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the received first calibration information. 26. The gas sensor device according to item 24 or 25. [Item 27] a position information acquiring unit for acquiring position information of the second gas sensor device, the reliability information includes position information of the first gas sensor device, the calibration unit calibrates the gas concentration of the measurement target, which is calculated based on an output of the second gas sensor, based on the received first calibration information in accordance with a distance between a position of the first gas sensor device and a position of the second gas sensor device acquired by the position information acquisition unit. 27. The gas sensor device according to any one of items 24 to 26. [Item 28] 28. The gas sensor apparatus according to item 27, wherein the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor when the distance is less than a predetermined distance. [Item 29] the receiving unit receives the first calibration information of each of the plurality of first gas sensor devices; the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor, based on the first calibration information of each of the plurality of first gas sensor devices. 29. The gas sensor device according to any one of items 23 to 28. [Item 30] the receiving unit receives reliability information of each of the plurality of first gas sensor devices; the calibration unit weights the calibration reliability of each of the plurality of first gas sensor devices, and calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the weighted calibration reliability. Item 30. The gas sensor device according to item 29. [Item 31] Item 31. The gas sensor device according to item 30, wherein the calibration unit calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on a highest calibration reliability among the calibration reliability of each of the plurality of first gas sensor devices. [Item 32] a transmitting step of transmitting first calibration information by a transmitting unit, the first calibration information being calibration information for calibrating a gas concentration of a measurement target calculated based on an output of the first gas sensor; a receiving step in which a receiving unit receives the first calibration information transmitted in the transmitting step; a calibration step in which a calibration unit calibrates a gas concentration of the measurement target calculated based on an output of the second gas sensor, based on the first calibration information received in the receiving step; A gas sensor calibration method comprising: [Item 33] Item 33. The gas sensor calibration method according to item 32, wherein the measurement target, the gas concentration of which is calculated based on the output of the first gas sensor, and the measurement target, the gas concentration of which is calculated based on the output of the second gas sensor, are the same. [Item 34] the second gas sensor is provided in a second gas sensor device, Item 34. The gas sensor calibration method according to item 32 or 33, wherein the second gas sensor device is disposed in an internal space of the measurement target, the gas concentration of which is calculated based on an output of the second gas sensor. [Item 35] the first gas sensor is provided in a first gas sensor device, the transmitting step is a step of the transmitting unit further transmitting reliability information indicating a calibration reliability of the first gas sensor device, the receiving step is a step of the receiving unit further receiving the reliability information transmitted in the transmitting step, the calibration step is a step in which the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor in accordance with a calibration reliability of the first gas sensor device, based on the first calibration information received in the receiving step. Item 35. The gas sensor calibration method according to item 34. [Item 36] Item 36. The gas sensor calibration method according to item 35, wherein the calibration step is a step in which, when a reliability of self-calibration of the second gas sensor device is equal to or lower than a predetermined second threshold value and a calibration reliability of the first gas sensor device exceeds a first threshold value, the calibration unit calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on the first calibration information received in the receiving step. [Item 37] Item 37. The gas sensor calibration method according to item 35 or 36, wherein the calibration step is a step of comparing the calibration reliability of the first gas sensor device received in the receiving step with the calibration reliability of the second gas sensor device, and, if the calibration reliability of the first gas sensor device is higher than the calibration reliability of the second gas sensor device, calibrating the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the first calibration information received in the receiving step. [Item 38] The method further includes a storage step of storing the reliability information received in the receiving step by a storage unit, the calibration step is a step in which the calibration unit compares the calibration reliability of the first gas sensor device received in the receiving step with the calibration reliability of the first gas sensor device stored in the storing step, and if the calibration reliability of the first gas sensor device received in the receiving step is higher than the calibration reliability stored in the storing step, calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the first calibration information received in the receiving step. Item 38. The gas sensor calibration method according to item 36 or 37. [Item 39] a position information acquiring step of acquiring position information of the second gas sensor device by a position information acquiring unit, the reliability information includes position information of the first gas sensor device, the calibration step is a step in which the calibration unit calibrates the gas concentration of the measurement target, which is calculated based on an output of the second gas sensor, based on the received first calibration information in accordance with a distance between a position of the first gas sensor device and a position of the second gas sensor device acquired in the position information acquisition step. Item 39. A gas sensor calibration method according to any one of items 36 to 38. [Item 40] 40. The gas sensor calibration method according to item 39, wherein the calibration step is a step of calibrating the gas concentration of the measurement target, which is calculated based on the output of the second gas sensor, based on the received first calibration information, when the distance is less than a predetermined distance. [Item 41] the receiving step is a step in which the receiving unit receives first calibration information of each of the plurality of first gas sensor devices, the calibration step is a step of calibrating the gas concentration of the measurement target calculated based on the output of the second gas sensor, based on the first calibration information of each of the plurality of first gas sensor devices received in the receiving step, by the calibration unit. 41. A gas sensor calibration method according to any one of items 36 to 40. [Item 42] the transmitting step is a step of the transmitting unit further transmitting the reliability information of each of the plurality of first gas sensor devices; the receiving step is a step of the receiving unit further receiving each of the reliability information transmitted in the transmitting step, the calibration step is a step in which the calibration unit weights the calibration reliability of each of the plurality of first gas sensor devices, and calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on the weighted calibration reliability. Item 42. The gas sensor calibration method according to item 41. [Item 43] Item 43. The gas sensor calibration method according to item 42, wherein the calibration step is a step of calibrating the gas concentration of the measurement target, which is calculated based on an output of the second gas sensor, based on the highest calibration reliability among the calibration reliability of each of the plurality of first gas sensor devices. [Item 44] a transmitting step of transmitting the first calibration information to the second gas sensor device by a transmitting unit; The first calibration information is calibration information for calibrating a gas concentration of a measurement target calculated based on an output of the first gas sensor. Gas sensor calibration methods. [Item 45] the second gas sensor device has a second gas sensor; Item 45. The gas sensor calibration method according to item 44, wherein the measurement target, the gas concentration of which is calculated based on the output of the first gas sensor, and the measurement target, the gas concentration of which is calculated based on the output of the second gas sensor, are the same. [Item 46] the first gas sensor is provided in a first gas sensor device, Item 46. The gas sensor calibration method according to item 44 or 45, wherein the transmitting step is a step of further transmitting reliability information indicating a calibration reliability of the first gas sensor device to the second gas sensor device by the transmitting section. [Item 47] a receiving step of receiving first calibration information of the first gas sensor device by a receiving unit; a calibration step in which a calibration unit calibrates a gas concentration of the measurement target calculated based on an output of the second gas sensor, based on the first calibration information received by the receiving unit; A gas sensor calibration method comprising: [Item 48] the first gas sensor device has a first gas sensor, Item 48. The gas sensor calibration method according to item 47, wherein a measurement target whose gas concentration is calculated based on the output of the first gas sensor and a measurement target whose gas concentration is calculated based on the output of the second gas sensor are the same. [Item 49] Item 49. The gas sensor calibration method according to item 47 or 48, wherein the second gas sensor is disposed in an internal space of the measurement target, the gas concentration of which is calculated based on an output of the second gas sensor. [Item 50] the receiving step is a step of the receiving unit further receiving reliability information indicating a calibration reliability of the first gas sensor device, the calibration step is a step in which the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor in accordance with a calibration reliability of the first gas sensor device, based on the first calibration information received in the receiving step. 50. A gas sensor calibration method according to any one of items 47 to 49. [Item 51] the second gas sensor is provided in a second gas sensor device, Item 51. The gas sensor calibration method according to Item 50, wherein the calibration step is a step in which, when a reliability of self-calibration of the second gas sensor device is equal to or lower than a predetermined second threshold value and a calibration reliability of the first gas sensor device exceeds a first threshold value, the calibration unit calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on the first calibration information received in the receiving step. [Item 52] Item 52. The gas sensor calibration method according to Item 51, wherein the calibration step is a step of comparing the calibration reliability of the first gas sensor device received in the receiving step with the calibration reliability of the second gas sensor device, and, if the calibration reliability of the first gas sensor device is higher than the calibration reliability of the second gas sensor device, calibrating the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the first calibration information received in the receiving step. [Item 53] The method further includes a storage step of storing the reliability information received in the receiving step by a storage unit, the calibration step is a step in which the calibration unit compares the calibration reliability of the first gas sensor device received in the receiving step with the calibration reliability of the first gas sensor device stored in the storing step, and when the calibration reliability of the first gas sensor device received in the receiving step is higher than the calibration reliability stored in the storing step, calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the first calibration information received in the receiving step. Item 53. The gas sensor calibration method according to item 51 or 52. [Item 54] a position information acquiring step of acquiring position information of the second gas sensor device by a position information acquiring unit, the reliability information includes position information of the first gas sensor device, the calibration step is a step in which the calibration unit calibrates the gas concentration of the measurement target, which is calculated based on an output of the second gas sensor in accordance with a distance between a position of the first gas sensor device and a position of the second gas sensor device acquired in the position information acquisition step, based on the first calibration information received in the reception step. 54. A gas sensor calibration method according to any one of items 51 to 53. [Item 55] Item 55. The gas sensor calibration method according to item 54, wherein the calibration step is a step of calibrating the gas concentration of the measurement target calculated based on the output of the second gas sensor by the calibration unit when the distance is less than a predetermined distance. [Item 56] the receiving step is a step in which the receiving unit receives the first calibration information of each of the plurality of first gas sensor devices, the calibration step is a step of calibrating the gas concentration of the measurement target calculated based on the output of the second gas sensor, based on the first calibration information of each of the plurality of first gas sensor devices received in the receiving step, by the calibration unit. 56. A gas sensor calibration method according to any one of items 50 to 55. [Item 57] the receiving step is a step of the receiving unit further receiving reliability information of each of the plurality of first gas sensor devices, the calibration step is a step in which the calibration unit weights the calibration reliability of each of the plurality of first gas sensor devices, and calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on the weighted calibration reliability. Item 57. The gas sensor calibration method according to item 56. [Item 58] Item 54. The gas sensor calibration method according to item 53, wherein the calibration step is a step of calibrating the gas concentration of the measurement target, which is calculated based on an output of the second gas sensor, based on the highest calibration reliability among the calibration reliability of each of the plurality of first gas sensor devices. [Item 59] A gas sensor calibration program for causing a computer to execute the gas sensor calibration method according to any one of Items 32 to 43. [Item 60] A gas sensor calibration program for causing a computer to execute the gas sensor calibration method according to any one of Items 44 to 46. [Item 61] A gas sensor calibration program for causing a computer to execute the gas sensor calibration method according to any one of Items 47 to 58. [Explanation of symbols]

[0226] REFERENCE SIGNS LIST 10 receiving unit, 11 first gas sensor, 12 display unit, 13 transmitting unit, 14 calibration unit, 15 control unit, 16 position information acquisition unit, 20 receiving unit, 21 second gas sensor, 22 display unit, 23 transmitting unit, 24 calibration unit, 25 control unit, 26 position information acquisition unit, 30 receiving unit, 31 third gas sensor , 32 display section, 33 transmission section, 34 calibration section, 35 control section, 90 living body, 100 first gas sensor device, 110 calculation section, 112 storage section, 114 AD conversion section, 120 calculation section, 122 storage section, 124 AD conversion section, 150 gas sensor device, 200 second gas sensor device, 250 gas sensor sensor device, 300...third gas sensor device, 400...gas sensor system, 501...measurement object, 502...measurement object, 503...gas, 504...gas, 505...measurement object, 508...internal space, 600...gas sensor, 2200...computer, 2201...DVD-ROM, 2210...host controller, 2212...CPU, 2214...RAM, 2216...graphics controller, 2218...display device, 2220...input / output controller, 2222...communication interface, 2224...hard disk drive, 2226...DVD-ROM drive, 2230...ROM, 2240...input / output chip, 2242...keyboard

Claims

1. a first gas sensor device having a transmitter for transmitting first calibration information for calibrating a gas concentration of a measurement target calculated based on an output of a first gas sensor, the transmitter transmitting the first calibration information and reliability information indicating a calibration reliability of the first gas sensor device; a second gas sensor device including a receiving unit that receives the first calibration information and the reliability information transmitted by the transmitting unit, and a calibration unit that calibrates a gas concentration of a measurement target calculated based on an output of the second gas sensor, based on the first calibration information received by the receiving unit; Equipped with the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the received first calibration information when the calibration reliability of the first gas sensor device received by the receiving unit is higher than a reference calibration reliability. Gas sensor system.

2. the second gas sensor device further includes a storage unit configured to store reference reliability information indicating the reference calibration reliability, when the calibration reliability of the first gas sensor device received by the receiving unit is higher than the reference calibration reliability, the storage unit updates the reference calibration reliability based on the calibration reliability of the first gas sensor device received by the receiving unit. The gas sensor system according to claim 1 .

3. 3. The gas sensor system according to claim 1, wherein the measurement target, the gas concentration of which is calculated based on the output of the first gas sensor, is the same as the measurement target, the gas concentration of which is calculated based on the output of the second gas sensor.

4. the first gas sensor device has the first gas sensor, The first gas sensor device is a mobile terminal.

3. The gas sensor system according to claim 1.

5. 5. The gas sensor system according to claim 4, wherein the second gas sensor device is disposed in an internal space of the measurement target, the gas concentration of which is calculated based on an output of the second gas sensor.

6. the second gas sensor device has the second gas sensor, The second gas sensor device is a mobile terminal.

3. The gas sensor system according to claim 1.

7. 3. The gas sensor system according to claim 1, wherein when a reliability of self-calibration of the second gas sensor device is equal to or lower than a predetermined second threshold and a calibration reliability of the first gas sensor device exceeds a first threshold, the calibration unit calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on the received first calibration information.

8. the second gas sensor device further includes a position information acquiring unit that acquires position information of the second gas sensor device, the reliability information includes position information of the first gas sensor device, the calibration unit calibrates the gas concentration of the measurement target, which is calculated based on an output of the second gas sensor, based on the received first calibration information in accordance with a distance between a position of the first gas sensor device and a position of the second gas sensor device acquired by the position information acquisition unit.

3. The gas sensor system according to claim 1.

9. A plurality of the first gas sensor devices are provided, the receiving unit receives first calibration information and the reliability information for each of the plurality of first gas sensor devices; the calibration unit weights the calibration reliability of each of the plurality of first gas sensor devices, and calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the weighted calibration reliability.

3. The gas sensor system according to claim 1.

10. 10. The gas sensor system according to claim 9, wherein the calibration unit calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on a highest calibration reliability among the calibration reliability of each of the plurality of first gas sensor devices.

11. a transmitting step of transmitting first calibration information and reliability information by a transmitting unit, the first calibration information being calibration information for calibrating a gas concentration of a measurement target calculated based on an output of the first gas sensor, and the reliability information being reliability information indicating a calibration reliability of the first gas sensor device; a receiving step in which a receiving unit receives the first calibration information and the reliability information transmitted in the transmitting step; a calibration step in which a calibration unit calibrates a gas concentration of the measurement target calculated based on an output of the second gas sensor, based on the first calibration information received in the receiving step; Equipped with the calibration step is a step of, when the calibration reliability of the first gas sensor device received in the receiving step is higher than a reference calibration reliability, the calibration unit calibrates the gas concentration of the measurement target calculated based on the output of the second gas sensor based on the received first calibration information. Gas sensor calibration methods.

12. The method further includes a storage step of storing the reliability information received in the receiving step by a storage unit, the storing step includes an updating step of updating the reference calibration reliability based on the calibration reliability of the first gas sensor device received in the receiving step, when the calibration reliability of the first gas sensor device received in the receiving step is higher than the reference calibration reliability. The method for calibrating a gas sensor according to claim 11.

13. 13. The gas sensor calibration method according to claim 11, wherein the measurement target, the gas concentration of which is calculated based on the output of the first gas sensor, and the measurement target, the gas concentration of which is calculated based on the output of the second gas sensor, are the same.

14. the second gas sensor is provided in a second gas sensor device, the second gas sensor device is disposed in an internal space of the measurement target, the gas concentration of which is calculated based on an output of the second gas sensor; 13. The method for calibrating a gas sensor according to claim 11 or 12.

15. the second gas sensor is provided in a second gas sensor device, 13. The gas sensor calibration method according to claim 11, wherein the calibration step is a step in which, when a reliability of self-calibration of the second gas sensor device is equal to or lower than a predetermined second threshold value and a calibration reliability of the first gas sensor device exceeds a first threshold value, the calibration section calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on the first calibration information received in the receiving step.

16. the second gas sensor is provided in a second gas sensor device, a position information acquiring step of acquiring position information of the second gas sensor device by a position information acquiring unit; the reliability information includes position information of the first gas sensor device, the calibration step is a step in which the calibration unit calibrates the gas concentration of the measurement target, which is calculated based on an output of the second gas sensor, in accordance with a distance between a position of the first gas sensor device and a position of the second gas sensor device acquired in the position information acquisition step, based on the received first calibration information.

13. The method for calibrating a gas sensor according to claim 11 or 12.

17. the receiving step is a step in which the receiving unit receives first calibration information and the reliability information of each of the plurality of first gas sensor devices, the calibration step is a step in which the calibration unit weights the calibration reliability of each of the plurality of first gas sensor devices, and calibrates the gas concentration of the measurement target calculated based on an output of the second gas sensor based on the weighted calibration reliability.

13. The method for calibrating a gas sensor according to claim 11 or 12.

18. 18. The gas sensor calibration method according to claim 17, wherein the calibration step is a step of calibrating the gas concentration of the measurement target, which is calculated based on the output of the second gas sensor, based on a highest calibration reliability among the calibration reliability of each of the plurality of first gas sensor devices.

19. A gas sensor calibration program for causing a computer to execute the gas sensor calibration method according to claim 11 or 12.

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