Temperature measurement system and method for measuring temperature

Abstract

To provide a temperature measurement system and a method for measuring a temperature which can accurately measure the surface temperature of a measurement target object even when the temperature measurement system is located away from the measurement target object.SOLUTION: The temperature measurement system includes: a radiation temperature measurement unit for measuring a surface temperature of a measurement target object contactlessly; an absolute moisture acquisition unit for acquiring an absolute moisture of a space between the measurement target object and the radiation temperature measurement unit; and an operation unit for correcting the measurement temperature measured by the radiation temperature measurement unit on the basis of the absolute moisture acquired by the absolute moisture acquisition unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present application relates to a temperature measurement system and a temperature measurement method. [Background technology]

[0002] A non-contact radiation thermometer is known as a thermometer that measures the temperature of an object without contacting it, and detects infrared rays emitted from the object and calculates the temperature from the amount of energy. When such a radiation thermometer is used to measure the temperature of an object located at a distance, there is a problem that part of the infrared rays is absorbed by the amount of water vapor between the radiation thermometer and the object, reducing the signal (infrared rays) that reaches the sensor, and the measured temperature is lower than the actual temperature of the object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-182122 A Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide a temperature measurement system and a temperature measurement method that can accurately measure the surface temperature of an object to be measured even when the object is far away. [Means for solving the problem]

[0005] The temperature measurement system includes a radiation temperature measurement unit that measures the surface temperature of an object to be measured without contact, an absolute humidity acquisition unit that acquires an absolute humidity in a space between the measurement object and the radiation temperature measurement unit; and a calculation unit that corrects the temperature measured by the radiation temperature measurement unit based on the absolute humidity acquired by the absolute humidity acquisition unit.

[0006] The temperature measuring method uses the above-mentioned temperature measuring system to measure the surface temperature of the measurement object. [Brief description of the drawings]

[0007] [Figure 1] 1 is a schematic diagram of an overall temperature measurement system according to an embodiment; [Diagram 2] FIG. 2 is a control block diagram of an absolute humidity acquisition unit according to the embodiment; [Diagram 3] FIG. 2 is a control block diagram of a calculation unit according to the embodiment; [Figure 4] Graph showing the relationship between relative humidity and absolute humidity [Diagram 5] Graph showing the relationship between the temperature (℃) measured by the radiation temperature measurement section and absolute humidity (g / m3) [Figure 6] FIG. 13 is an overall schematic diagram of a temperature measurement system according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of a temperature measurement system and a temperature measurement method will be described with reference to Figures 1 to 5. Note that in each figure, the dimensional ratios in the drawing do not necessarily match the actual dimensional ratios, and the dimensional ratios between the drawings do not necessarily match either.

[0009] 1, the temperature measurement system 1 includes a radiation temperature measurement unit 2, an absolute humidity acquisition unit 3, and a calculation unit 4. Here, the temperature measurement system 1 will be described as measuring the surface temperature of a measurement object O located at a predetermined distance L away from the radiation temperature measurement unit 2. The distance L is, for example, 10 m or more. The temperature measurement system 1 may include an output unit 6 that outputs the measured surface temperature of the measurement object O. The "output" may be, for example, a display on a monitor, a printout by a printer, a transmission to an external device by a communication unit, or storage in a storage medium by a media writing device. The temperature measurement system 1 may also include a control unit 7 that controls the respective units 2, 3, 4, and 6.

[0010] The radiation temperature measuring unit 2 is, for example, a radiation thermometer that measures the surface temperature of the measurement object O in a non-contact manner. In the radiation thermometer, infrared rays radiated from the measurement object O are focused on a temperature sensor (thermopile) by a lens. The temperature sensor (thermopile) generates an output signal according to the incident infrared energy, and this output signal is converted into temperature by a microcomputer or the like. The radiation temperature measuring unit 2 outputs data of the measured temperature (hereinafter referred to as measured temperature) to the calculation unit 4. The radiation temperature measuring unit 2 may be configured by a thermography camera.

[0011] The absolute humidity acquisition unit 3 acquires the absolute humidity in the space S between the measurement object O and the radiation temperature measurement unit 2. The absolute humidity acquisition unit 3 outputs the acquired absolute humidity data to the calculation unit 4. In this embodiment, the absolute humidity is assumed to be constant in the space S between the measurement object O and the radiation temperature measurement unit 2.

[0012] The absolute humidity acquisition unit 3 may include an input unit 3a that accepts input from a measurement operator. The input unit 3a is configured, for example, with a touch panel or a keyboard. The relative humidity measured by a relative humidity sensor 3d capable of measuring relative humidity and the air temperature measured by a temperature sensor 3e capable of measuring air temperature are input to the input unit 3a. These relative humidity sensor 3d and temperature sensor 3e measure the relative humidity and the air temperature in the space S between the measurement object O and the radiation temperature measurement unit 2. The relative humidity and the air temperature may be input to the input unit 3a directly from the relative humidity sensor 3d and the temperature sensor 3e by wired communication or wireless communication. The input unit 3a outputs the input data of the relative humidity and the air temperature to the calculation unit 3b.

[0013] Moreover, the absolute humidity acquisition unit 3 may include a calculation unit 3b that calculates the absolute humidity from the relative humidity and air temperature inputted from the input unit 3a, and a storage unit 3c that stores data relating to the relative humidity and absolute humidity.

[0014] FIG. 4 is a graph showing the relationship between relative humidity and absolute humidity. As shown in FIG. 4, there is a correlation between relative humidity and absolute humidity. Also, even if the relative humidity is the same, the higher the temperature, the greater the amount of saturated water vapor, and therefore the higher the absolute humidity. The memory unit 3c stores data relating to the relative humidity and absolute humidity shown in FIG. 4, for example.

[0015] The calculation unit 3b can calculate the absolute humidity from the input relative humidity and air temperature using the data stored in the memory unit 3c. The calculation unit 3b outputs the acquired absolute humidity data to the operation unit 4.

[0016] The calculation unit 4 may include a computer having a processor such as a CPU and an MPU (for example, a temperature correction unit 4a), a memory such as a ROM and a RAM (for example, a storage unit 4b), various interfaces, etc. The calculation unit 4 may be realized by the processor executing a program stored in the memory, and the software and hardware working together.

[0017] The calculation unit 4 includes a temperature correction unit 4a that corrects the temperature measured by the radiation temperature measurement unit 2 based on the absolute humidity acquired by the absolute humidity acquisition unit 3. The calculation unit 4 also includes a memory unit 4b that stores the temperature measured by the radiation temperature measurement unit 2 and data on the correction value for correction by the temperature correction unit 4a.

[0018] FIG. 5 shows the temperature (°C) measured by the radiation temperature measuring unit 2 when measuring the surface temperature of a measurement target located at a distance L, and the absolute humidity (g / m 3 5 is a graph showing the relationship between absolute humidity and the amount of water vapor present in the space S between the object to be measured O and the radiation temperature measuring unit 2. As shown in FIG. 5, the measured temperature of the radiation temperature measuring unit 2 decreases as the absolute humidity increases. This is because, as the absolute humidity increases, the amount of water vapor present in the space S between the object to be measured O and the radiation temperature measuring unit 2 increases, causing a greater attenuation of the infrared rays irradiated from the object to be measured O. At this time, regardless of the air temperature, the measured temperature of the radiation temperature measuring unit 2 decreases at approximately the same rate as the absolute humidity increases. The memory unit 4b stores data relating to the amount of decrease in the measured temperature due to the absolute humidity, for example, as shown in FIG. 5.

[0019] Using the data stored in the memory unit 4b, the temperature correction unit 4a corrects the temperature measured by the radiation temperature measurement unit 2 based on the absolute humidity acquired by the absolute humidity acquisition unit 3. Specifically, the temperature correction unit 4a adds a correction value (amount of decrease in the measured temperature due to the amount of water vapor present in the space S) according to the deviation between the surface temperature of the measurement object O caused by the absolute humidity (amount of water vapor) of the space S and the temperature measured by the radiation temperature measurement unit 2 to the measured temperature measured by the radiation temperature measurement unit 2, to obtain the surface temperature of the measurement object O.

[0020] As described above, the temperature measurement system 1 of this embodiment comprises a radiation temperature measurement unit 2 that measures the surface temperature of the measurement object O in a non-contact manner, an absolute humidity acquisition unit 3 that acquires the absolute humidity of the space S between the measurement object O and the radiation temperature measurement unit 2, and a calculation unit 4 that corrects the temperature measured by the radiation temperature measurement unit 2 based on the absolute humidity acquired by the absolute humidity acquisition unit 3.

[0021] According to this configuration, the measured temperature, which is reduced due to the amount of water vapor present in the space S between the object to be measured O and the radiation temperature measuring unit 2, can be corrected based on the absolute humidity, so that the measured temperature can be brought closer to the actual surface temperature of the object to be measured O, thereby enabling the surface temperature of the object to be measured O to be measured accurately.

[0022] In addition, as in this embodiment, the calculation unit 4 has a memory unit 4b for storing data of a correction value corresponding to the deviation between the surface temperature and the measured temperature caused by the absolute humidity, The calculation unit 4 may be configured to add a correction value to the measured temperature to obtain the surface temperature.

[0023] According to this configuration, the surface temperature of the measurement object O can be measured accurately.

[0024] Furthermore, as in this embodiment, the absolute humidity obtaining unit 3 may be configured to calculate the absolute humidity from the relative humidity of the space S and the air temperature.

[0025] With this configuration, the absolute humidity of the space S can be obtained accurately.

[0026] The temperature measurement system 1 is not limited to the configuration of the above-mentioned embodiment, and is not limited to the above-mentioned action and effect. Of course, various modifications can be made to the temperature measurement system 1 without departing from the gist of the present invention. For example, it is of course possible to arbitrarily select one or more of the configurations, methods, etc. according to the various modified examples described below and adopt them in the configurations, methods, etc. according to the above-mentioned embodiment.

[0027] (1) In the temperature measurement system 1 according to the above embodiment, the absolute humidity acquisition unit 3 is configured to calculate the absolute humidity from the relative humidity and the air temperature in the space S. However, the temperature measurement system 1 is not limited to this configuration. For example, the absolute humidity acquisition unit 3 may be configured by a humidity sensor capable of measuring absolute humidity.

[0028] (2) In the temperature measurement system 1 according to the above embodiment, the measured temperature of the measurement object O is corrected with the distance L between the measurement object O and the radiation temperature measurement unit 2 fixed. However, the temperature measurement system 1 is not limited to such a configuration. For example, as shown in FIG. 6, the temperature measurement system 1 may include a distance acquisition unit 5 that acquires the distance between the measurement object O and the radiation temperature measurement unit 2. The distance acquisition unit 5 is, for example, configured with a laser distance meter. The calculation unit 4 may correct the temperature measured by the radiation temperature measurement unit 2 based on the distance acquired by the distance acquisition unit 5. Since the amount of water vapor present in the space S between the measurement object O and the radiation temperature measurement unit 2 changes depending on the distance between the measurement object O and the radiation temperature measurement unit 2, the longer the distance, the greater the amount of decrease in the measured temperature from the actual surface temperature. Therefore, by correcting the measured temperature based on the distance between the measurement object O and the radiation temperature measurement unit 2, the measured temperature can be brought closer to the actual surface temperature of the measurement object O, and the surface temperature of the measurement object O can be accurately measured.

[0029] (3) The temperature measurement system 1 according to the above embodiment is capable of accurately measuring the surface temperature of the object to be measured O by correcting the temperature measured by the radiation temperature measurement unit 2 based on the absolute humidity acquired by the absolute humidity acquisition unit 3 under the condition that the distance between the object to be measured O and the radiation temperature measurement unit 2 is known (distance L).

[0030] In addition, under the condition that the distance between the object to be measured O and the radiation temperature measuring unit 2 and the actual surface temperature of the object to be measured O are known, the absolute humidity of the space S can be calculated from the temperature difference between the measured temperature measured by the radiation temperature measuring unit 2 and the actual surface temperature.

[0031] In addition, under the condition that the actual surface temperature of the object to be measured O is known, the distance between the object to be measured O and the radiation temperature measurement unit 2 can be calculated based on the absolute humidity acquired by the absolute humidity acquisition unit 3 and the temperature measured by the radiation temperature measurement unit 2.

[0032] (4) In the temperature measurement system 1 according to the above embodiment, the absolute humidity in the space S is assumed to be constant, but the absolute humidity in the space S may be non-uniform. For example, under the condition that the distance between the measurement object O and the radiation temperature measurement unit 2 and the actual surface temperature of the measurement object O are known, if there is a difference between the absolute humidity calculated from this condition and the absolute humidity acquired by the absolute humidity acquisition unit 3, it can be said that there is variation in the absolute humidity in the space S between the measurement object O and the radiation temperature measurement unit 2. In particular, when the measurement object O and the radiation temperature measurement unit 2 are arranged apart in the vertical direction, the distribution difference in absolute humidity tends to be significant in the vertical direction. Therefore, if the variation in absolute humidity in the space can be detected, it can be used as a trigger to force convection in the space using a circulator installed on the ceiling. [Explanation of symbols]

[0033] 1...Temperature measurement system, 2...Radiation temperature measurement unit, 3...Absolute humidity acquisition unit, 3a...Input unit, 3b...Calculation unit, 3c...Memory unit, 3d...Relative humidity sensor, 3e...Temperature sensor, 4...Calculation unit, 4a...Temperature correction unit, 4b...Memory unit, 5...Distance acquisition unit, 6...Output unit, 7...Control unit, O...Measurement object unit, S...Space, L...Distance

Claims

1. a radiation temperature measurement unit that measures the surface temperature of the object to be measured in a non-contact manner; an absolute humidity acquisition unit that acquires the absolute humidity of the space between the measurement object and the radiation temperature measurement unit; a calculation unit that corrects the temperature measured by the radiation temperature measurement unit based on the absolute humidity acquired by the absolute humidity acquisition unit.

2. the calculation unit has a storage unit that stores data of a correction value corresponding to a deviation between the surface temperature and the measured temperature caused by the absolute humidity, The temperature measurement system according to claim 1 , wherein the calculation unit adds the correction value to the measured temperature to obtain the surface temperature.

3. The temperature measurement system according to claim 1 , wherein the absolute humidity acquisition unit calculates the absolute humidity from the relative humidity and the air temperature of the space.

4. a distance acquisition unit that acquires the distance between the measurement object and the radiation temperature measurement unit, The temperature measurement system according to claim 1 , wherein the calculation unit corrects the measured temperature based on the distance acquired by the distance acquisition unit.

5. A temperature measurement method for measuring the surface temperature of the object to be measured using the temperature measurement system according to claim 1 or 2.

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