Gas concentration detection method, device and equipment

Abstract

The invention discloses a gas concentration detection method, device and equipment. The gas concentration detection method comprises the following steps: a semiconductor sensor detects a first detected gas with a first concentration and generates a first response signal, and detects a second detected gas with a second concentration and generates a second response signal; the first concentration is greater than the second concentration; sequentially and repeatedly executing the detection steps by adopting a plurality of semiconductor sensors to generate a plurality of first response signals and a plurality of second response signals; calculating a zero electric signal according to the first response signal generated by each semiconductor sensor and the corresponding second response signal; one semiconductor sensor is used for detecting a real-time electric signal in the current environment; according to the zero point electric signal, the first response signal of one semiconductor sensor and the real-time electric signal, whether the detected gas exists in the current environment or not is judged, and the real-time concentration of the detected gas is generated. According to the embodiment of the invention, the detection effect of low-concentration gas is improved.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, and in particular to a method, apparatus and equipment for detecting gas concentration. Background Technology

[0002] Semiconductor materials can be used for gas concentration detection; however, due to their sensitivity, they are easily affected by the environment and their own state, especially when detecting low-concentration gases, making it difficult to obtain accurate test values. Therefore, existing technologies are prone to false alarms or missed detections when detecting low-concentration gases, resulting in poor detection performance. Summary of the Invention

[0003] This invention provides a method, apparatus, and device for detecting gas concentration, in order to solve the problem of poor detection effect for low-concentration gases.

[0004] According to one aspect of the present invention, a method for detecting gas concentration is provided, comprising:

[0005] A semiconductor sensor detects a first gas to be measured at a first concentration and generates a first response signal, and detects a second gas to be measured at a second concentration and generates a second response signal; the first concentration is greater than the second concentration.

[0006] The above detection steps are repeated sequentially using multiple semiconductor sensors to generate multiple first response signals and multiple second response signals;

[0007] The zero-point electrical signal is calculated based on the first response signal and the corresponding second response signal generated by each of the semiconductor sensors.

[0008] One of the semiconductor sensors is used to detect real-time electrical signals in the current environment;

[0009] Based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, and the real-time electrical signal, it is determined whether the gas to be measured is present in the current environment, and the real-time concentration of the gas to be measured is generated.

[0010] Optionally, calculating the zero-point electrical signal based on the first response signal generated by each of the semiconductor sensors and the corresponding second response signal includes:

[0011] The difference between the first response signal and the second response signal generated by the semiconductor sensor is obtained;

[0012] Repeat the above calculation steps to calculate the signal difference of each of the semiconductor sensors, and take the smallest signal difference as the pre-increment signal;

[0013] The difference between the pre-increment signal and the error increment signal is used to obtain the increment signal;

[0014] The zero-point electrical signal corresponding to each of the first response signals is obtained by subtracting the incremental signal from each of the semiconductor sensors.

[0015] Optionally, after subtracting each of the first response signals from the incremental signal to obtain the zero-point electrical signal corresponding to each of the semiconductor sensors, the method further includes:

[0016] Change the ambient temperature and humidity, and repeat the steps to calculate the zero-point electrical signal.

[0017] Optionally, determining whether the gas to be measured exists in the current environment based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, and the real-time electrical signal, and generating the real-time concentration of the gas to be measured, includes:

[0018] When the real-time electrical signal is greater than the zero-point electrical signal, the measured gas is present in the environment.

[0019] When the real-time electrical signal is between the zero-point electrical signal and the first response signal, the real-time concentration is calculated based on the voltage difference between the real-time electrical signal and the zero-point electrical signal, and the first concentration divided by the voltage difference between the first response signal and the zero-point electrical signal.

[0020] Optionally, before the semiconductor sensor detects the first gas to be measured at a first concentration and generates a first response signal, and detects the second gas to be measured at a second concentration and generates a second response signal, the method further includes:

[0021] The semiconductor sensor detects the concentration of the first gas to be measured at the first concentration under a calibrated temperature and humidity environment, and generates a calibration electrical signal; the calibration electrical signal is used to generate a compensation coefficient.

[0022] Optionally, after the semiconductor sensor detects a first gas at a first concentration and generates a first response signal, and detects a second gas at a second concentration and generates a second response signal, the method further includes:

[0023] Under multiple different ambient temperatures and humidity conditions, the semiconductor sensor detects the first concentration of the first gas to be measured and generates multiple first response signals;

[0024] Based on the calibration electrical signal and multiple first response signals, calculate the compensation coefficient between different ambient temperatures and humidity levels and the calibration temperature and humidity environment;

[0025] The compensation coefficient, combined with the calibration electrical signal, generates the first response signal under a full range of ambient temperature and humidity.

[0026] Optionally, before the semiconductor sensor detects a first gas at a first concentration and generates a first response signal, and detects a second gas at a second concentration and generates a second response signal, the method further includes:

[0027] The concentration of at least one third gas to be measured is detected by a semiconductor sensor under the calibrated temperature and humidity environment, and at least one high-calibration electrical signal is generated; the high-calibration electrical signal is used to improve the detection range of the real-time concentration; wherein the third concentration is greater than the first concentration.

[0028] Optionally, the compensation coefficient is combined with the high-calibration electrical signal to generate a third response signal under a full range of ambient temperature and humidity.

[0029] Based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, the third response signal of one of the semiconductor sensors, and the real-time electrical signal, it is determined whether the gas to be measured is present in the current environment, and the real-time concentration of the gas to be measured is generated.

[0030] According to another aspect of the present invention, a gas concentration detection device is provided, comprising:

[0031] A detection control module is used to control a semiconductor sensor to detect a first gas to be tested at a first concentration and generate a first response signal, and to detect a second gas to be tested at a second concentration and generate a second response signal; the first concentration is greater than the second concentration; the above detection steps are repeated sequentially using multiple semiconductor sensors to generate multiple first response signals and multiple second response signals;

[0032] The calculation module is used to calculate the zero-point electrical signal based on the first response signal generated by each of the semiconductor sensors and the corresponding second response signal;

[0033] The detection and control module is also used to detect real-time electrical signals in the current environment using one of the semiconductor sensors;

[0034] The concentration generation module is used to determine whether the gas to be measured is present in the current environment based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, and the real-time electrical signal, and to generate the real-time concentration of the gas to be measured.

[0035] According to another aspect of the present invention, a gas concentration detection device is provided, comprising: a semiconductor sensor and a controller; the controller is connected to the semiconductor sensor; the controller is used to execute the gas concentration detection method described in any embodiment of the present invention.

[0036] The technical solution provided in this invention, after detecting a first gas at a first concentration, can continue to detect a second gas at a second concentration, and calculate the zero-point electrical signal based on the first and second response signals generated by each semiconductor sensor. Compared to directly calculating the zero-point electrical signal by sampling the second response signal, calculating the zero-point electrical signal using the first and second response signals has higher accuracy and reduces testing errors caused by directly testing low-concentration gases. When calculating the real-time concentration of the gas in the environment using this zero-point electrical signal, more accurate concentration test data is obtained, and the probability of false alarms or missed alarms during low-concentration testing is effectively reduced, resulting in better detection performance.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart of a gas concentration detection method provided according to an embodiment of the present invention;

[0040] Figure 2 This is a flowchart of a specific implementation method of S130 provided by an embodiment of the present invention;

[0041] Figure 3 This is a flowchart of another gas concentration detection method provided according to an embodiment of the present invention;

[0042] Figure 4 This is a flowchart of another gas concentration detection method provided according to an embodiment of the present invention;

[0043] Figure 5 This is a flowchart of another gas concentration detection method provided according to an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of a gas concentration detection device provided according to an embodiment of the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] This invention provides a method for detecting gas concentration. Figure 1 This is a flowchart illustrating a gas concentration detection method provided in an embodiment of the present invention. (See reference...) Figure 1 Methods for detecting gas concentration include:

[0048] S110, The semiconductor sensor detects a first gas to be measured at a first concentration and generates a first response signal, and detects a second gas to be measured at a second concentration and generates a second response signal.

[0049] Semiconductor sensors are prone to errors when detecting gas concentrations. The error is greater for low-concentration gases, especially those below 50 ppm, compared to high-concentration gases. Therefore, directly detecting low-concentration gases may not yield an accurate response signal, leading to significant errors in calculating the zero-point electrical signal of the semiconductor sensor. For example, if the first concentration is greater than the second concentration (e.g., 50 ppm and 20 ppm), the error in the first response signal will be smaller than that in the second response signal.

[0050] However, due to the characteristics of semiconductor sensors, within similar time periods, the direction of error deviation generally tends to be consistent. Furthermore, since the first concentration is greater than the second concentration, the test error of the semiconductor sensor for the first response signal will be relatively small. However, because the second concentration is lower, if the second concentration is detected multiple times, there will be significant differences between the generated second response signals each time. If the second response signal is directly used as the zero-point electrical signal, it will be impossible to select a suitable value.

[0051] Therefore, compared to the changes between the individual second response signals, the change in the difference between the first response signal and the second response signal will be smaller than the change between the individual second response signals.

[0052] Therefore, after detecting the first gas at a first concentration, the second gas at a second concentration can be detected. When calculating the zero-point electrical signal subsequently, the value of the zero-point electrical signal can be inversely deduced from the difference between the first and second response signals.

[0053] S120. The above detection steps are repeated sequentially using multiple semiconductor sensors to generate multiple first response signals and multiple second response signals.

[0054] When multiple semiconductor sensors are used for simultaneous detection, each semiconductor sensor can test the first gas to be tested at a first concentration and the second gas to be tested at a second concentration to obtain test data for each semiconductor sensor.

[0055] Optionally, the sequential detection of the first and second target gases by multiple semiconductor sensors is not a limitation of this invention. In other embodiments, multiple semiconductor sensors may simultaneously detect the first target gas at a first concentration, and after detection, the multiple semiconductor sensors may simultaneously detect the second target gas at a second concentration.

[0056] S130. Calculate the zero-point electrical signal based on the first response signal and the corresponding second response signal generated by each semiconductor sensor.

[0057] The zero-point electrical signal can be used to represent the lowest value of the concentration range that the semiconductor sensor can detect. When the real-time electrical signal detected by the semiconductor sensor is less than the zero-point electrical signal, it can be used to indicate that there is no gas being measured in the current environment.

[0058] Specifically, when each semiconductor sensor detects a first analyte gas at a first concentration and a second analyte gas at a second concentration, the first response signals generated by each semiconductor sensor may differ to some extent, and the second response signals may also differ to some extent. The signal difference value measured by each semiconductor sensor can be obtained by subtracting the first and second response signals generated by each semiconductor sensor.

[0059] Since there may be some differences between the signal differences measured by various semiconductor sensors, and the magnitudes of the signal differences may vary, the smallest signal difference can be selected and used to calculate the zero-point electrical signal.

[0060] If the second response signal is directly used as the zero-point electrical signal, the significant differences between the various second response signals make it impossible to select a suitable value when choosing the zero-point electrical signal. For example, when calculating the zero-point electrical signal of a semiconductor sensor, the zero-point electrical signal can be generated by subtracting the smallest signal difference from the first response signal of the semiconductor sensor. By subtracting the first and second response signals of each semiconductor sensor, the resulting signal difference will have a smaller variation relative to the fluctuation of the second response signal. Therefore, by subtracting this signal difference from the first response signal, a relatively accurate zero-point electrical signal can be obtained. Compared to directly testing the second response signal to deduce the zero-point electrical signal, this method has higher accuracy and reduces the probability of false alarms or missed alarms during concentration testing.

[0061] For example, when calculating the zero-point electrical signal, errors caused by factors such as semiconductor sensors and environmental differences can be corrected by subtracting a certain error increment signal from the signal difference, thereby slightly increasing the value of the zero-point electrical signal. This setting method can further reduce the probability of false alarms for gas during the final concentration test.

[0062] S140. Use one of the semiconductor sensors to detect real-time electrical signals in the current environment.

[0063] S150. Based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, and the real-time electrical signal, determine whether the gas to be measured is present in the current environment, and generate the real-time concentration of the gas to be measured.

[0064] When calculating the real-time concentration of the gas being measured in the environment, one of the semiconductor sensors can detect the gas being measured and generate a real-time electrical signal.

[0065] When the real-time electrical signal is less than or equal to the zero-point electrical signal, it indicates that the gas being measured is not present in the environment. When the real-time electrical signal is greater than the zero-point electrical signal, it indicates that the gas being measured is present in the environment, and the concentration can then be further detected.

[0066] For example, the value of the zero-point electrical signal can be used to represent the gas being measured at zero concentration, and the value of the first response signal of the semiconductor sensor can be used to represent the gas being measured at a concentration of 50 ppm. By determining the positional relationship between the real-time electrical signal and the zero-point electrical signal and the first response signal, the real-time concentration of the gas being measured can be obtained according to the corresponding ratio.

[0067] The technical solution provided in this invention, after detecting a first gas at a first concentration, can continue to detect a second gas at a second concentration, and calculate the zero-point electrical signal based on the first and second response signals generated by each semiconductor sensor. Compared to directly calculating the zero-point electrical signal by sampling the second response signal, calculating the zero-point electrical signal using the first and second response signals has higher accuracy and reduces testing errors caused by directly testing low-concentration gases. When calculating the real-time concentration of the gas in the environment using this zero-point electrical signal, more accurate concentration test data is obtained, and the probability of false alarms or missed alarms during low-concentration testing is effectively reduced, resulting in better detection performance.

[0068] Figure 2 A flowchart illustrating a specific implementation method of S130 provided in an embodiment of the present invention. (See reference...) Figure 2 Based on the above embodiments, optionally, S130, calculating the zero-point electrical signal according to the first response signal generated by each semiconductor sensor and the corresponding second response signal includes:

[0069] S131. Subtract the first response signal and the second response signal generated by the semiconductor sensor to obtain the signal difference value.

[0070] S132. Determine whether each semiconductor sensor has obtained the signal difference value. If yes, proceed to S133; otherwise, return to S131.

[0071] S133. Use the smallest signal difference as the pre-increment signal.

[0072] Because the first concentration is greater than the second concentration, the error of the first response signal generated by the semiconductor sensor will be smaller than the error of the second response signal. However, since the direction of error offset of semiconductor sensors generally tends to be consistent, and the errors between each first response signal are relatively small, the rate of change of the signal difference between the first and second response signals of each semiconductor sensor will be smaller than the rate of change of the second response signal directly measured. When calculating the zero-point electrical signal, only the smallest signal difference needs to be selected as the pre-increment signal.

[0073] S134. Subtract the pre-increment signal from the error increment signal to obtain the increment signal.

[0074] Among them, the error caused by factors such as semiconductor sensor and environmental differences can be obtained by subtracting an error increment signal from the pre-increment signal to obtain the increment signal.

[0075] For example, when three semiconductor sensors are set, and the signal differences between the three semiconductor sensors are 7mV, 10mV and 15mV respectively, the signal difference may have a large error due to the influence of environmental factors. Therefore, an error increment signal of 1mV can be set to obtain an increment signal of 6mV.

[0076] When the signal differences between the three semiconductor sensors are 10mV, 11mV, and 12mV respectively, the error between the signal differences is small, and the test data of the semiconductor sensors is relatively accurate. Therefore, a 0mV error increment signal can be set to obtain a 10mV increment signal. Alternatively, a smaller error increment signal can be set to obtain an increment signal slightly less than 10mV.

[0077] S135. Subtract each first response signal from the incremental signal to obtain the zero-point electrical signal corresponding to each semiconductor sensor.

[0078] Each semiconductor sensor can be configured with a corresponding zero-point electrical signal. Compared to directly testing the second response signal to obtain the zero-point electrical signal, the method of deriving the zero-point electrical signal from the difference between the first response signal and the incremental signal has higher accuracy. Furthermore, by setting a reasonable incremental signal, a more reliable zero-point electrical signal can be obtained, reducing the probability of false gas alarms.

[0079] The technical solution provided by this invention, by calculating the incremental signal and using the first response signal to deduce the zero-point electrical signal setting method, effectively reduces the error of semiconductor sensor in detecting low-concentration gases, improves the accuracy of the zero-point electrical signal, and has a better testing effect when performing concentration detection by semiconductor sensor, reducing the probability of false alarms or missed alarms during low-concentration testing.

[0080] Based on the above embodiments, optionally, after S135, subtracting each first response signal from the incremental signal to obtain the zero-point electrical signal corresponding to each semiconductor sensor, the method further includes: changing the ambient temperature and humidity, and repeatedly performing the step of calculating the zero-point electrical signal.

[0081] In actual concentration testing, the temperature of the gas being tested may change due to environmental factors, which in turn leads to changes in concentration. Therefore, it is necessary to test the zero-point electrical signal multiple times under different temperatures and humidity levels to obtain the zero-point electrical signal under different temperatures and humidity levels.

[0082] When detecting the concentration of a gas, different zero-point electrical signals can be used to calculate the real-time concentration of the gas based on its temperature and humidity. This setting improves the accuracy of gas concentration detection and further reduces the probability of false alarms or missed alarms during low-concentration testing.

[0083] Figure 3 A flowchart illustrating another gas concentration detection method provided in an embodiment of the present invention. (See reference...) Figure 3 Based on the above embodiments, optionally, S150, determining whether the gas to be measured exists in the current environment based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, and the real-time electrical signal, and generating the real-time concentration of the gas to be measured, includes:

[0084] S151. Determine whether the real-time electrical signal is greater than the zero-point electrical signal. If yes, proceed to S153; otherwise, proceed to S152.

[0085] S152. The gas to be measured is not present in the current environment.

[0086] The value of the zero-point electrical signal can be used to represent the zero concentration of the gas being measured. When the real-time electrical signal is less than the zero-point electrical signal, it means that the concentration of the gas being measured is outside the range of the semiconductor sensor, which can be equivalent to the concentration of the gas being measured being zero, and there is no gas being measured in the current environment.

[0087] S153. Determine whether the real-time electrical signal is between the zero-point electrical signal and the first response signal. If so, proceed to S154.

[0088] S154. Calculate the real-time concentration based on the voltage difference between the real-time electrical signal and the zero-point electrical signal, and the first concentration divided by the voltage difference between the first response signal and the zero-point electrical signal.

[0089] The value of the first response signal can be used to represent the first concentration of the gas being measured. When the real-time electrical signal is between the zero-point electrical signal and the first response signal, it means that the real-time concentration reflected by the real-time electrical signal is between zero concentration and the first concentration.

[0090] Since the change in real-time concentration is positively correlated with the change in real-time electrical signal, the real-time concentration of the gas being measured in the environment can be obtained by dividing the first concentration by the voltage difference between the first response signal and the zero-point electrical signal, and then multiplying the result by the voltage difference between the real-time electrical signal and the zero-point electrical signal.

[0091] That is, real-time concentration = (real-time electrical signal - zero-point electrical signal) × first concentration / (first response signal - zero-point electrical signal).

[0092] Figure 4 A flowchart illustrating yet another gas concentration detection method provided in an embodiment of the present invention. (See reference...) Figure 4 Based on the above embodiments, optionally, before S110, when the semiconductor sensor detects the first gas to be measured at a first concentration and generates a first response signal, and detects the second gas to be measured at a second concentration and generates a second response signal, the method further includes:

[0093] S160. The concentration of the first gas to be measured is detected by a semiconductor sensor under a calibrated temperature and humidity environment, and a calibration electrical signal is generated.

[0094] Before use, the semiconductor sensor can be calibrated in a constant temperature and humidity environment to generate a calibration electrical signal. For example, the calibration temperature and humidity can be 20 degrees Celsius and 65% humidity.

[0095] The calibration signal can be used to represent the reference value of the semiconductor sensor. When the ambient temperature and humidity change, the electrical signal output by the semiconductor sensor changes proportionally to the calibration signal.

[0096] When a semiconductor sensor is placed in a calibration temperature and humidity environment with a first concentration of the measured gas, the semiconductor sensor generates a calibration electrical signal. The magnitude of the calibration electrical signal changes with variations in temperature and humidity. For example, when both temperature and humidity increase, the magnitude of the calibration electrical signal increases; when both temperature and humidity decrease, the magnitude of the calibration electrical signal decreases. When temperature increases and humidity decreases, or vice versa, the direction of change in the magnitude of the calibration electrical signal can be determined based on the specific changes in temperature and humidity. This direction of change is the compensation coefficient.

[0097] Continue to refer to Figure 4 Based on the above embodiments, optionally, after S110, where the semiconductor sensor detects the first gas to be measured at a first concentration and generates a first response signal, and detects the second gas to be measured at a second concentration and generates a second response signal, the method further includes:

[0098] S170. Under multiple different ambient temperatures and humidity conditions, the semiconductor sensor detects the first concentration of the first gas to be measured and generates multiple first response signals.

[0099] S180. Based on the calibration electrical signal and multiple first response signals, calculate the compensation coefficient between different ambient temperatures and humidity levels and the calibration temperature and humidity environment.

[0100] S190, the compensation coefficient, and the calibration electrical signal are combined to generate the first response signal under the full range of ambient temperature and humidity.

[0101] Specifically, when changing the ambient temperature and humidity and detecting the first concentration of the first analyte gas under multiple different ambient temperature and humidity conditions, the semiconductor sensor can generate multiple first response signals under different ambient temperature and humidity conditions. Based on the data of the multiple first response signals under different ambient temperature and humidity conditions, the direction of change of the first response signal data when both ambient temperature and humidity increase or decrease; when temperature increases and humidity decreases; or when temperature decreases and humidity increases can be obtained. This direction of change can be represented by a compensation coefficient.

[0102] Therefore, the compensation coefficient can be used to calculate the specific value of the first response signal under different temperatures and humidity levels. When the semiconductor sensor is under different ambient temperatures and humidity levels, the first response signal can be converted. When calculating the real-time concentration of the gas being measured under different ambient temperatures and humidity levels, the first response signal can be converted using the compensation coefficient before calculation, thereby improving the accuracy of the real-time concentration calculation.

[0103] Figure 5 A flowchart illustrating yet another gas concentration detection method provided in an embodiment of the present invention. (See reference...) Figure 5 Based on the above embodiments, optionally, before S110, where the semiconductor sensor detects the first gas to be measured at a first concentration and generates a first response signal, and detects the second gas to be measured at a second concentration and generates a second response signal, the method further includes:

[0104] S200: The concentration of at least one third gas to be measured is detected by a semiconductor sensor under a calibrated temperature and humidity environment, and at least one high-calibration electrical signal is generated; the high-calibration electrical signal is used to improve the detection range of real-time concentration.

[0105] Among them, when the semiconductor sensor is calibrated under a calibration temperature and humidity environment, it can be calibrated once under multiple concentration environments. For example, it can be calibrated for a third concentration greater than the first concentration and generate a high calibration electrical signal.

[0106] Optionally, the compensation coefficient, combined with the high-calibration electrical signal, generates a third response signal covering the entire range of ambient temperature and humidity. Therefore, when calculating real-time concentration, the detection range of real-time concentration can be expanded by using the third response signal covering the entire range of ambient temperature and humidity.

[0107] Continue to refer to Figure 5 Based on the above embodiments, optionally, after step S140, where one of the semiconductor sensors detects the real-time electrical signal in the current environment, the method further includes:

[0108] S210. Based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, the third response signal of one of the semiconductor sensors, and the real-time electrical signal, determine whether the gas to be measured is present in the current environment, and generate the real-time concentration of the gas to be measured.

[0109] Specifically, when the real-time electrical signal is less than or equal to the zero-point electrical signal, it indicates that the gas being measured is not present in the environment. When the real-time electrical signal is greater than the zero-point electrical signal, it indicates that the gas being measured is present in the environment, and the concentration can then be further detected.

[0110] When the real-time electrical signal is between the zero-point electrical signal and the first response signal, it indicates that the real-time concentration reflected by the real-time electrical signal is between zero concentration and the first concentration.

[0111] When the real-time electrical signal is between the first response signal and the third response signal, it indicates that the real-time concentration reflected by the real-time electrical signal is between the first concentration and the third concentration.

[0112] Therefore, by adding a third response signal, the concentration testing range of the gas being measured can be expanded. Adding multiple third response signals can further increase the concentration testing range of the gas being measured.

[0113] This invention also provides a gas concentration detection device. Figure 6 This is a schematic diagram of a gas concentration detection device provided in an embodiment of the present invention. (Reference) Figure 6The device includes: a detection control module 1, used to control a semiconductor sensor to detect a first gas of a first concentration and generate a first response signal, and to detect a second gas of a second concentration and generate a second response signal; the first concentration is greater than the second concentration; multiple semiconductor sensors are used to sequentially repeat the above detection steps to generate multiple first response signals and multiple second response signals. A calculation module 2 is used to calculate a zero-point electrical signal based on the first response signals and corresponding second response signals generated by each semiconductor sensor. The detection control module is also used to detect a real-time electrical signal in the current environment using one of the semiconductor sensors. A concentration generation module 3 is used to determine whether the gas to be measured is present in the current environment based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, and the real-time electrical signal, and to generate the real-time concentration of the gas to be measured.

[0114] The gas concentration detection device provided in the embodiments of the present invention can execute the gas concentration detection method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the method, which will not be described in detail here.

[0115] This invention also provides a gas concentration detection device. The gas concentration detection device includes: a semiconductor sensor and a controller; the controller is connected to the semiconductor sensor; the controller is used to execute the gas concentration detection method provided in any embodiment of this invention. The gas concentration detection device has the corresponding functional modules and beneficial effects for executing the method, which will not be elaborated further.

[0116] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0117] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting gas concentration, characterized in that, include: A semiconductor sensor detects a first gas to be measured at a first concentration and generates a first response signal, and detects a second gas to be measured at a second concentration and generates a second response signal; the first concentration is greater than the second concentration. The above detection steps are repeated sequentially using multiple semiconductor sensors to generate multiple first response signals and multiple second response signals; The zero-point electrical signal is calculated based on the first response signal and the corresponding second response signal generated by each of the semiconductor sensors. One of the semiconductor sensors is used to detect real-time electrical signals in the current environment; Based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, and the real-time electrical signal, it is determined whether the gas to be measured is present in the current environment, and the real-time concentration of the gas to be measured is generated.

2. The method for detecting gas concentration according to claim 1, characterized in that, The step of calculating the zero-point electrical signal based on the first response signal generated by each of the semiconductor sensors and the corresponding second response signal includes: The difference between the first response signal and the second response signal generated by the semiconductor sensor is obtained; Repeat the above calculation steps to calculate the signal difference of each of the semiconductor sensors, and take the smallest signal difference as the pre-increment signal; The difference between the pre-increment signal and the error increment signal is used to obtain the increment signal; The zero-point electrical signal corresponding to each of the first response signals is obtained by subtracting the incremental signal from each of the semiconductor sensors.

3. The method for detecting gas concentration according to claim 2, characterized in that, After subtracting each of the first response signals from the incremental signal to obtain the zero-point electrical signal corresponding to each of the semiconductor sensors, the method further includes: Change the ambient temperature and humidity, and repeat the steps to calculate the zero-point electrical signal.

4. The method for detecting gas concentration according to claim 1, characterized in that, The step of determining whether the gas to be measured is present in the current environment based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, and the real-time electrical signal, and generating the real-time concentration of the gas to be measured, includes: When the real-time electrical signal is greater than the zero-point electrical signal, the measured gas is present in the environment. When the real-time electrical signal is between the zero-point electrical signal and the first response signal, the real-time concentration is calculated based on the voltage difference between the real-time electrical signal and the zero-point electrical signal, and the first concentration divided by the voltage difference between the first response signal and the zero-point electrical signal.

5. The method for detecting gas concentration according to claim 1, characterized in that, Before the semiconductor sensor detects a first gas at a first concentration and generates a first response signal, and detects a second gas at a second concentration and generates a second response signal, the process further includes: The semiconductor sensor detects the concentration of the first gas to be measured at the first concentration under a calibrated temperature and humidity environment, and generates a calibration electrical signal; the calibration electrical signal is used to generate a compensation coefficient.

6. The method for detecting gas concentration according to claim 5, characterized in that, After the semiconductor sensor detects a first gas at a first concentration and generates a first response signal, and detects a second gas at a second concentration and generates a second response signal, the process further includes: Under multiple different ambient temperatures and humidity conditions, the semiconductor sensor detects the first concentration of the first gas to be measured and generates multiple first response signals; Based on the calibration electrical signal and multiple first response signals, calculate the compensation coefficient between different ambient temperatures and humidity levels and the calibration temperature and humidity environment; The compensation coefficient, combined with the calibration electrical signal, generates the first response signal under a full range of ambient temperature and humidity.

7. The method for detecting gas concentration according to claim 6, characterized in that, Before the semiconductor sensor detects a first gas at a first concentration and generates a first response signal, and detects a second gas at a second concentration and generates a second response signal, the method further includes: The concentration of at least one third gas to be measured is detected by a semiconductor sensor under the calibrated temperature and humidity environment, and at least one high-calibration electrical signal is generated; the high-calibration electrical signal is used to improve the detection range of the real-time concentration; wherein the third concentration is greater than the first concentration.

8. The method for detecting gas concentration according to claim 7, characterized in that, The compensation coefficient, combined with the high-calibration electrical signal, generates a third response signal under a full range of ambient temperature and humidity. Based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, the third response signal of one of the semiconductor sensors, and the real-time electrical signal, it is determined whether the gas to be measured is present in the current environment, and the real-time concentration of the gas to be measured is generated.

9. A gas concentration detection device, characterized in that, include: A detection control module is used to control a semiconductor sensor to detect a first gas to be tested at a first concentration and generate a first response signal, and to detect a second gas to be tested at a second concentration and generate a second response signal; the first concentration is greater than the second concentration; the above detection steps are repeated sequentially using multiple semiconductor sensors to generate multiple first response signals and multiple second response signals; The calculation module is used to calculate the zero-point electrical signal based on the first response signal generated by each of the semiconductor sensors and the corresponding second response signal; The detection and control module is also used to detect real-time electrical signals in the current environment using one of the semiconductor sensors; The concentration generation module is used to determine whether the gas to be measured is present in the current environment based on the zero-point electrical signal, the first response signal of one of the semiconductor sensors, and the real-time electrical signal, and to generate the real-time concentration of the gas to be measured.

10. A gas concentration detection device, characterized in that, include: Semiconductor sensors and controllers; The controller is connected to the semiconductor sensor; The controller is used to perform the gas concentration detection method according to any one of claims 1-8.

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