A Fourier transform infrared gas analysis method and system

Abstract

The present invention provides a Fourier transform infrared gas analysis method and system. The method includes: real-time monitoring of humidity data in the on-site environment of the gas to be analyzed; real-time adjustment of the sampling frequency range of the infrared sensor to obtain the sampling frequency range of the infrared sensor corresponding to the humidity data; within the sampling frequency range of the infrared sensor corresponding to the humidity data, real-time adjustment of the sampling frequency of the external sensor; obtaining the infrared sensor sampling frequency that matches the current humidity in the on-site environment of the gas to be analyzed; performing gas sampling within the infrared sensor sampling frequency range, extracting the output signal corresponding to the fixed frequency output by the infrared sensor, and performing Fourier transform processing on the output signal corresponding to the fixed frequency output. Then, reprocessing is carried out using an optical algorithm of a mathematical model combining partial least squares method, and finally, the gas concentration value corresponding to the output signal is obtained. The system includes modules corresponding to the method steps.

Description

Technical Field

[0001] The present invention provides a Fourier transform infrared gas analysis method and system, belonging to the technical field of gas detection. Background Art

[0002] There is a one-to-many correspondence between portable Fourier transform infrared gas analyzers and on-site working conditions. The difficulty lies in how to make one analyzer adapt to the test work in different on-site working conditions, that is, how to achieve accurate measurement for different working conditions. This requires customizing exclusive chemometric methods for different working conditions. For example, the applicability is not strong in high humidity and low sulfur, ammonia escape, and ultra-high humidity (waste incineration) occasions. Existing portable Fourier transform infrared gas analyzers cannot give accurate quantitative analysis results. Summary of the Invention

[0003] The present invention provides a Fourier transform infrared gas analysis method and system to solve the problem that in the gas analysis occasion with a large humidity situation in the prior art, the humidity situation is likely to affect the gas concentration detection, resulting in a decrease in the accuracy of gas concentration detection.

[0004] A Fourier transform infrared gas analysis method, the Fourier transform infrared gas analysis method is based on an infrared gas analyzer for gas analysis. The infrared gas analyzer includes a humidity sensor, an infrared sensor, and a core processor. The Fourier transform infrared gas analysis method includes:

[0005] Real-time monitoring of humidity data in the on-site environment of the gas to be analyzed through the humidity sensor;

[0006] According to the monitored humidity data in the on-site environment of the gas to be analyzed, the sampling frequency range of the infrared sensor is adjusted in real time to obtain the sampling frequency range of the infrared sensor corresponding to the humidity data;

[0007] Within the sampling frequency range of the infrared sensor corresponding to the humidity data, the sampling frequency of the external sensor is adjusted in real time; the sampling frequency of the infrared sensor matching the current humidity in the on-site environment of the gas to be analyzed is obtained;

[0008] Gas sampling is performed within the sampling frequency range of the infrared sensor, and the output fixed frequency corresponding to the current infrared sensor is determined according to the humidity data. The output signal corresponding to the output fixed frequency of the infrared sensor is extracted, and the output signal corresponding to the output fixed frequency is subjected to Fourier transform processing, and then reprocessed by combining the mathematical model optical algorithm of the partial least squares method, and finally the gas concentration value corresponding to the output signal is obtained.

[0009] Further, according to the humidity data in the on-site environment of the gas to be analyzed monitored, the sampling frequency range of the infrared sensor is adjusted in real time, including:

[0010] Compare the humidity data in the on-site environment of the gas to be analyzed monitored with a preset first humidity threshold and a second humidity threshold;

[0011] Determine the sampling frequency range of the infrared sensor according to the comparison results of the humidity data in the on-site environment of the gas to be analyzed with the preset first humidity threshold and second humidity threshold;

[0012] Wherein, the humidity value corresponding to the second humidity threshold is higher than the humidity value corresponding to the first humidity threshold, and the specific settings of the first humidity threshold and the second humidity threshold need to be preset according to the gas environment to be measured, wherein the gas environment includes high-humidity and low-sulfur and ultra-high-humidity (waste incineration) occasions, etc.

[0013] Further, determine the sampling frequency range of the infrared sensor according to the comparison results of the humidity data in the on-site environment of the gas to be analyzed with the preset first humidity threshold and second humidity threshold, including:

[0014] When the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold, the sampling frequency range of the infrared sensor is 300Hz - 430Hz;

[0015] When the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, the sampling frequency range of the infrared sensor is 420Hz - 540Hz;

[0016] When the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, the sampling frequency range of the infrared sensor is 470Hz - 580Hz.

[0017] Further, within the sampling frequency range of the infrared sensor corresponding to the humidity data, the sampling frequency of the external sensor is adjusted in real time, including:

[0018] When the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold, set a first sampling frequency adjustment gradient, and within the sampling frequency range of 300Hz - 430Hz of the infrared sensor, starting from 300Hz, adjust the sampling frequency of the infrared sensor upward to 430Hz with the first sampling frequency adjustment gradient as the adjustment degree; wherein, the first sampling frequency adjustment gradient is obtained through the following formula:

[0019]

[0020] Among them, Q1 represents the first sampling frequency adjustment gradient; S 1y represents the first humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency basic parameter, and the value range of W0 is 12Hz - 20Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6Hz - 12Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data obtained corresponding to the i-th humidity data acquisition;

[0021] When the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, set the second sampling frequency adjustment gradient, and within the sampling frequency range of 420Hz - 540Hz of the infrared sensor, starting from 420Hz, adjust the sampling frequency of the infrared sensor upward to 540Hz with the second sampling frequency adjustment gradient as the adjustment degree; among them, the second sampling frequency adjustment gradient is obtained through the following formula:

[0022]

[0023] Among them, Q2 represents the second sampling frequency adjustment gradient; S 2y represents the second humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency basic parameter, and the value range of W0 is 12Hz - 20Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6Hz - 12Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data obtained corresponding to the i-th humidity data acquisition;

[0024] When the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, set the third sampling frequency adjustment gradient, and within the sampling frequency range of 470Hz - 580Hz of the infrared sensor, starting from 470Hz, adjust the sampling frequency of the infrared sensor upward to 580Hz with the second sampling frequency adjustment gradient as the adjustment degree.

[0025] Among them, the third sampling frequency adjustment gradient is obtained through the following formula:

[0026]

[0027] Among them, Q3 represents the third sampling frequency adjustment gradient; S 3yrepresents the third humidity threshold; S represents the humidity data of the on-site environment of the gas to be analyzed currently monitored; W0 represents the basic parameter of the sampling frequency, and the value range of W0 is 12Hz - 20Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6Hz - 12Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data obtained by corresponding monitoring during the i-th humidity data acquisition.

[0028] Further, obtaining the sampling frequency of the infrared sensor matching the humidity in the on-site environment of the current gas to be analyzed includes:

[0029] During the adjustment process of the sampling frequency of the infrared sensor, the gas concentration value obtained is observed in real time;

[0030] When a sampling frequency adjustment from the starting point to the final value point of the frequency range is completed within the sampling frequency range, the sampling frequency corresponding to the floating range of the gas concentration value of the gas to be analyzed being less than 3.8% of the average gas concentration value is used as the sampling frequency of the infrared sensor matching the humidity in the current gas on-site environment;

[0031] Among them, when the sampling frequency corresponding to the floating range of the gas concentration value of the gas to be analyzed being less than 3.8% of the average gas concentration value is not unique, the maximum sampling frequency among the multiple sampling frequencies is used as the sampling frequency of the infrared sensor matching the humidity in the current gas on-site environment.

[0032] A Fourier transform infrared gas analysis system, the Fourier transform infrared gas analysis system includes:

[0033] A humidity detection module, configured to monitor the humidity data of the on-site environment of the gas to be analyzed in real time through a humidity sensor;

[0034] A range acquisition module, configured to adjust the sampling frequency range of the infrared sensor in real time according to the monitored humidity data of the on-site environment of the gas to be analyzed, and obtain the sampling frequency range of the infrared sensor corresponding to the humidity data;

[0035] A frequency acquisition module, configured to adjust the sampling frequency of the external sensor in real time within the sampling frequency range of the infrared sensor corresponding to the humidity data; obtain the sampling frequency of the infrared sensor matching the humidity in the current on-site environment of the gas to be analyzed;

[0036] A concentration acquisition module, which is used to perform gas sampling within the sampling frequency range of the infrared sensor, determine the output fixed frequency corresponding to the current infrared sensor according to the humidity data, extract the output signal corresponding to the output fixed frequency of the infrared sensor, perform Fourier transform processing on the output signal corresponding to the output fixed frequency, and perform reprocessing using a mathematical model optical algorithm combining the partial least squares method, and finally obtain the gas concentration value corresponding to the output signal.

[0037] Further, the range acquisition module includes:

[0038] A comparison module, which is used to compare the humidity data in the on-site environment of the gas to be analyzed monitored with a preset first humidity threshold and a second humidity threshold;

[0039] A range determination module, which is used to determine the sampling frequency range of the infrared sensor through the comparison results of the humidity data in the on-site environment of the gas to be analyzed with the preset first humidity threshold and second humidity threshold;

[0040] Wherein, the humidity value corresponding to the second humidity threshold is higher than the humidity value corresponding to the first humidity threshold, and the specific settings of the first humidity threshold and the second humidity threshold need to be preset according to the gas environment to be measured. Among them, the gas environment includes high humidity and low sulfur and ultra-high humidity (waste incineration) occasions, etc.

[0041] Further, the range determination module includes:

[0042] A frequency range determination module one, which is used to determine the sampling frequency range of the infrared sensor as 300Hz - 430Hz when the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold;

[0043] A frequency range determination module two, which is used to determine the sampling frequency range of the infrared sensor as 420Hz - 540Hz when the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold;

[0044] A frequency range determination module three, which is used to determine the sampling frequency range of the infrared sensor as 470Hz - 580Hz when the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold.

[0045] Further, the frequency acquisition module includes:

[0046] The first frequency adjustment module is used to set the first sampling frequency adjustment gradient when the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold, and within the sampling frequency range of 300 Hz - 430 Hz of the infrared sensor, starting from 300 Hz, adjust the sampling frequency of the infrared sensor upward to 430 Hz with the first sampling frequency adjustment gradient as the adjustment degree; wherein, the first sampling frequency adjustment gradient is obtained through the following formula:

[0047]

[0048] Wherein, Q1 represents the first sampling frequency adjustment gradient; S 1y represents the first humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency basic parameter, and the value range of W0 is 12 Hz - 20 Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6 Hz - 12 Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data obtained corresponding to the i-th humidity data acquisition;

[0049] The second frequency adjustment module is used to set the second sampling frequency adjustment gradient when the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, and within the sampling frequency range of 420 Hz - 540 Hz of the infrared sensor, starting from 420 Hz, adjust the sampling frequency of the infrared sensor upward to 540 Hz with the second sampling frequency adjustment gradient as the adjustment degree; wherein, the second sampling frequency adjustment gradient is obtained through the following formula:

[0050]

[0051] Wherein, Q2 represents the second sampling frequency adjustment gradient; S 2y represents the second humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency basic parameter, and the value range of W0 is 12 Hz - 20 Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6 Hz - 12 Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data obtained corresponding to the i-th humidity data acquisition;

[0052] The frequency adjustment module three is used to set a third sampling frequency adjustment gradient when the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, and within the sampling frequency range of 470Hz - 580Hz of the infrared sensor, starting from 470Hz, adjust the sampling frequency of the infrared sensor upward to 580Hz with the second sampling frequency adjustment gradient as the adjustment degree.

[0053] Among them, the third sampling frequency adjustment gradient is obtained through the following formula:

[0054]

[0055] Among them, Q3 represents the third sampling frequency adjustment gradient; S 3y represents the third humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency basic parameter, and the value range of W0 is 12Hz - 20Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6Hz - 12Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data corresponding to the i-th humidity data acquisition.

[0056] Furthermore, the frequency acquisition module further includes:

[0057] The gas concentration detection module is used to observe and obtain the gas concentration value in real time during the sampling frequency adjustment process of the infrared sensor;

[0058] The frequency selection module is used to, when a sampling frequency adjustment from the starting point to the final value point of the frequency range is completed within the sampling frequency range, use the sampling frequency corresponding to the floating range of the gas concentration value of the gas to be analyzed being less than 3.8% of the gas concentration average value as the sampling frequency of the infrared sensor matching the current humidity in the gas on-site environment;

[0059] Among them, when the sampling frequency corresponding to the floating range of the gas concentration value of the gas to be analyzed being less than 3.8% of the gas concentration average value is not unique, the maximum sampling frequency among the multiple sampling frequencies is used as the sampling frequency of the infrared sensor matching the current humidity in the gas on-site environment.

[0060] Advantages of the present invention:

[0061] A Fourier transform infrared gas analysis method and system proposed by the present invention can detect the humidity data in the on-site environment of the gas to be analyzed, obtain the actual situation of the current humidity, and set the corresponding gas sampling frequency and the output fixed frequency of the infrared sensor according to the humidity situation in the on-site environment of the analyzed gas. It can match the gas sampling and the output fixed frequency of the infrared sensor with the humidity situation of the gas mixed in the actual on-site environment of the analyzed gas, thereby effectively improving the accuracy of gas concentration detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 is a flowchart of the method of the present invention;

[0063] Figure 2 is a schematic diagram of the system of the present invention;

[0064] Figure 3 is a system block diagram of the system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0065] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0066] An embodiment of the present invention proposes a Fourier transform infrared gas analysis method, as Figure 1 and Figure 2 shown. The Fourier transform infrared gas analysis method is based on an infrared gas analyzer for gas analysis. The infrared gas analyzer includes a humidity sensor, an infrared sensor, and a core processor. The Fourier transform infrared gas analysis method includes:

[0067] S1. Real-time monitor the humidity data in the on-site environment of the gas to be analyzed through the humidity sensor;

[0068] S2. According to the monitored humidity data in the on-site environment of the gas to be analyzed, adjust the sampling frequency range of the infrared sensor in real time, and obtain the sampling frequency range of the infrared sensor corresponding to the humidity data;

[0069] S3. Within the sampling frequency range of the infrared sensor corresponding to the humidity data, adjust the sampling frequency of the external sensor in real time; obtain the sampling frequency of the infrared sensor that matches the humidity in the current on-site environment of the gas to be analyzed;

[0070] S4. Perform gas sampling within the sampling frequency range of the infrared sensor, determine the output fixed frequency corresponding to the current infrared sensor according to the humidity data, extract the output signal corresponding to the output fixed frequency of the infrared sensor, perform Fourier transform processing on the output signal corresponding to the output fixed frequency, and perform reprocessing using the optical algorithm of the mathematical model combining partial least squares method, and finally obtain the gas concentration value corresponding to the output signal.

[0071] The working principle of the above technical solution is as follows: First, the humidity data in the on-site environment of the gas to be analyzed is monitored in real time by a humidity sensor; then, according to the monitored humidity data in the on-site environment of the gas to be analyzed, the sampling frequency range of the infrared sensor is adjusted in real time to obtain the sampling frequency range of the infrared sensor corresponding to the humidity data; afterwards, within the sampling frequency range of the infrared sensor corresponding to the humidity data, the sampling frequency of the external sensor is adjusted in real time; obtain the sampling frequency of the infrared sensor that matches the humidity in the current on-site environment of the gas to be analyzed; finally, perform gas sampling within the sampling frequency range of the infrared sensor, determine the output fixed frequency corresponding to the current infrared sensor according to the humidity data, extract the output signal corresponding to the output fixed frequency of the infrared sensor, perform Fourier transform processing on the output signal corresponding to the output fixed frequency, and perform reprocessing using the optical algorithm of the mathematical model combining partial least squares method, and finally obtain the gas concentration value corresponding to the output signal.

[0072] The effect of the above technical solution is as follows: A Fourier transform infrared gas analysis method proposed in this embodiment can detect the humidity data in the on-site environment of the gas to be analyzed, obtain the actual situation of the current humidity, and set the corresponding gas sampling frequency and the output fixed frequency of the infrared sensor according to the humidity situation in the on-site environment of the analyzed gas, which can match the gas sampling and the output fixed frequency of the infrared sensor with the humidity situation of the gas mixed in the actual on-site environment of the analyzed gas, thereby effectively improving the accuracy of gas concentration detection.

[0073] In one embodiment of the present invention, according to the monitored humidity data in the on-site environment of the gas to be analyzed, the sampling frequency range of the infrared sensor is adjusted in real time, including:

[0074] S201. Compare the monitored humidity data in the on-site environment of the gas to be analyzed with a preset first humidity threshold and a second humidity threshold;

[0075] S202. Determine the sampling frequency range of the infrared sensor according to the comparison results of the humidity data in the on-site environment of the gas to be analyzed with the preset first humidity threshold and the second humidity threshold;

[0076] Among them, the humidity value corresponding to the second humidity threshold is higher than the humidity value corresponding to the first humidity threshold, and the specific settings of the first humidity threshold and the second humidity threshold need to be preset according to the gas environment to be measured, where the gas environment includes high-humidity and low-sulfur and ultra-high-humidity (waste incineration) occasions, etc.

[0077] Specifically, the sampling frequency range of the infrared sensor is determined by the comparison results of the humidity data in the on-site environment of the gas to be analyzed with the preset first humidity threshold and second humidity threshold, including:

[0078] S2021. When the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold, the sampling frequency range of the infrared sensor is 300 Hz - 430 Hz;

[0079] S2022. When the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, the sampling frequency range of the infrared sensor is 420 Hz - 540 Hz;

[0080] S2023. When the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, the sampling frequency range of the infrared sensor is 470 Hz - 580 Hz.

[0081] The working principle and effect of the above technical solution are as follows: According to the different data processing times of gases with different humidity doping amounts during the concentration analysis and detection process, by adjusting the range of gas sampling frequencies corresponding to different humidities, the gas collection frequency with the best matching degree with the humidity doped in the current gas can be effectively obtained, so that the gas concentration data analysis can maintain an effective gas data analysis processing time under different humidity doping amounts. And through the above setting of the gas sampling frequency range, when the water vapor humidity content doped in the gas gradually changes, the corresponding sampling frequency range can maximize the acquisition of gas samples with humidity change characteristics. Furthermore, during the gas analysis process, the collection efficiency and timeliness of the water vapor humidity that does not change in the gas can be improved. Then, the gas collection frequency is coordinated with the collection frequency of humidity detection. When the output fixed frequency corresponding to the current infrared sensor is adjusted according to the actual situation of humidity data detection, the matching degree between the adjusted output fixed frequency and the water vapor humidity doping amount in the gas collection is maximized, thereby maximizing the accuracy of gas analysis and concentration detection. It effectively prevents the situation that due to the unreasonable matching of the gas collection frequency, when the output fixed frequency corresponding to the infrared sensor has been adjusted, it is impossible to timely obtain a gas sample with the corresponding water vapor humidity doping amount that matches the current output fixed frequency. As a result, in the initial stage after the output fixed frequency is adjusted, accurate gas concentration analysis data cannot be obtained due to untimely gas collection.

[0082] In an embodiment of the present invention, within the sampling frequency range of the infrared sensor corresponding to the humidity data, the sampling frequency of the external sensor is adjusted in real time, including:

[0083] Step 1: When the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold, set the first sampling frequency adjustment gradient, and within the sampling frequency range of 300 Hz - 430 Hz of the infrared sensor, starting from 300 Hz, adjust the sampling frequency of the infrared sensor upward to 430 Hz with the first sampling frequency adjustment gradient as the adjustment degree; wherein, the first sampling frequency adjustment gradient is obtained through the following formula:

[0084]

[0085] wherein, Q1 represents the first sampling frequency adjustment gradient; S 1y represents the first humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency base parameter, and the value range of W0 is 12 Hz - 20 Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6 Hz - 12 Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data corresponding to the i-th humidity data acquisition;

[0086] Step 2: When the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, set the second sampling frequency adjustment gradient, and within the sampling frequency range of 420 Hz - 540 Hz of the infrared sensor, starting from 420 Hz, adjust the sampling frequency of the infrared sensor upward to 540 Hz with the second sampling frequency adjustment gradient as the adjustment degree; wherein, the second sampling frequency adjustment gradient is obtained through the following formula:

[0087]

[0088] wherein, Q2 represents the second sampling frequency adjustment gradient; S 2y represents the second humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency base parameter, and the value range of W0 is 12 Hz - 20 Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6 Hz - 12 Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data corresponding to the i-th humidity data acquisition;

[0089] Step 3: When the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, set the third sampling frequency adjustment gradient, and within the sampling frequency range of 470 Hz - 580 Hz of the infrared sensor, starting from 470 Hz, adjust the sampling frequency of the infrared sensor upward to 580 Hz with the second sampling frequency adjustment gradient as the adjustment degree.

[0090] Among them, the third sampling frequency adjustment gradient is obtained through the following formula:

[0091]

[0092] Among them, Q3 represents the third sampling frequency adjustment gradient; S 3y represents the third humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency basic parameter, and the value range of W0 is 12 Hz - 20 Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6 Hz - 12 Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data monitored corresponding to the i-th humidity data acquisition.

[0093] The working principle of the above technical solution is as follows: First, when the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold, set the first sampling frequency adjustment gradient, and within the sampling frequency range of 300 Hz - 430 Hz of the infrared sensor, starting from 300 Hz, adjust the sampling frequency of the infrared sensor upward to 430 Hz with the first sampling frequency adjustment gradient as the adjustment degree; then, when the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, set the second sampling frequency adjustment gradient, and within the sampling frequency range of 420 Hz - 540 Hz of the infrared sensor, starting from 420 Hz, adjust the sampling frequency of the infrared sensor upward to 540 Hz with the second sampling frequency adjustment gradient as the adjustment degree; finally, when the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, set the third sampling frequency adjustment gradient, and within the sampling frequency range of 470 Hz - 580 Hz of the infrared sensor, starting from 470 Hz, adjust the sampling frequency of the infrared sensor upward to 580 Hz with the second sampling frequency adjustment gradient as the adjustment degree.

[0094] The effects of the above technical solution are as follows: According to the different data processing times of gases with different humidity doping amounts during concentration analysis and detection, by adjusting the range of gas sampling frequencies corresponding to different humidities, it is possible to effectively obtain the gas collection frequency with the best matching degree to the humidity doped in the current gas, so that the gas concentration data analysis can maintain an effective gas data analysis processing time under different humidity doping amounts. Moreover, through the above setting of the range of gas sampling frequencies, when the water vapor humidity content doped in the gas gradually changes, the corresponding sampling frequency range can maximize the acquisition of gas samples with humidity change characteristics. Furthermore, during the gas analysis process, it can improve the collection efficiency and timeliness of the water vapor humidity mixed in the gas without change, and then make the gas collection frequency match the collection frequency of humidity detection. When the output fixed frequency corresponding to the current infrared sensor is adjusted according to the actual situation of humidity data detection, it can maximize the matching degree between the adjusted output fixed frequency and the water vapor humidity doping amount in gas collection, and thus maximize the accuracy of gas analysis and concentration detection. It can effectively prevent the situation where, when the output fixed frequency corresponding to the infrared sensor has been adjusted, due to the unreasonable matching of the gas collection frequency, it is impossible to timely obtain a gas sample with the corresponding water vapor humidity doping amount that matches the current output fixed frequency. As a result, in the initial stage after the output fixed frequency is adjusted, accurate gas concentration analysis data cannot be obtained due to untimely gas collection.

[0095] On the other hand, by combining the sampling frequency adjustment gradient obtained through the above formula with the actual situation of humidity data, it is possible to adaptively adjust the sampling frequency adjustment gradient according to the actual situation of humidity data, which can effectively improve the matching degree between the gas sampling frequency and the humidity change in the gas. By obtaining the gas sampling frequency with the highest matching degree during the humidity change process, it can maximize the gas analysis sampling efficiency. Moreover, in the case where the water vapor humidity doped in the gas is constantly changing, through the adjustment of the gas sampling frequency and the acquisition of the corresponding optimal frequency, it can maximize the capture of the effective value of the water vapor humidity doped in the gas sample during the gas humidity change process, effectively preventing the problem that, in the case of frequent humidity changes, the low matching degree between the gas collection frequency and the humidity change leads to a low matching degree between the water vapor humidity data contained in the collected gas and the humidity value obtained by the humidity sensor, resulting in a low matching degree between the output fixed frequency of the infrared sensor and the actual situation of the gas sample, and thus inaccurate gas analysis data.

[0096] An embodiment of the present invention for obtaining the infrared sensor sampling frequency that matches the humidity in the on-site environment of the gas to be analyzed currently includes:

[0097] The first step: During the adjustment process of the sampling frequency of the infrared sensor, the gas concentration value obtained is observed in real time;

[0098] Step 2: After completing one adjustment of the sampling frequency from the starting point to the final value of the frequency range within the sampling frequency range, use the sampling frequency corresponding to the floating range of the gas concentration value of the gas to be analyzed being less than 3.8% of the average gas concentration value as the sampling frequency of the infrared sensor that matches the humidity in the current gas on-site environment;

[0099] Among them, when the sampling frequency corresponding to the floating range of the gas concentration value of the gas to be analyzed being less than 3.8% of the average gas concentration value is not unique, use the maximum sampling frequency among the multiple sampling frequencies as the sampling frequency of the infrared sensor that matches the humidity in the current gas on-site environment.

[0100] The working principle and effect of the above technical solution are as follows: According to the different data processing times of gases with different humidity doping amounts during the concentration analysis and detection process, by adjusting the range of the gas sampling frequency corresponding to different humidities, it is possible to effectively obtain the gas collection frequency with the best matching degree to the humidity doped in the current gas, so that the gas concentration data analysis can maintain an effective gas data analysis processing time under different humidity doping amounts. And, through the above setting of the gas sampling frequency range, when the water vapor humidity content doped in the gas gradually changes, the corresponding sampling frequency range can maximize the acquisition of gas samples with humidity change characteristics. Furthermore, during the gas analysis process, it can improve the collection efficiency and timeliness of the water vapor humidity in the gas without change, and then make the gas collection frequency cooperate with the collection frequency of humidity detection. When the output fixed frequency corresponding to the current infrared sensor is adjusted according to the actual situation of humidity data detection, it can maximize the matching degree between the adjusted output fixed frequency and the water vapor humidity doping amount in the gas collection, and then maximize the accuracy of gas analysis and concentration detection. It can effectively prevent the situation where, when the output fixed frequency corresponding to the infrared sensor has been adjusted, due to the unreasonable matching of the gas collection frequency, it is impossible to timely obtain a gas sample with the corresponding water vapor humidity doping amount that matches the current output fixed frequency. As a result, in the initial stage after the output fixed frequency is adjusted, due to the untimely gas collection, it is impossible to obtain accurate gas concentration analysis data.

[0101] An embodiment of the present invention proposes a Fourier transform infrared gas analysis system, as Figure 3 shown, the Fourier transform infrared gas analysis system includes:

[0102] A humidity detection module for real-time monitoring of the humidity data in the on-site environment of the gas to be analyzed through a humidity sensor;

[0103] A range acquisition module for, according to the monitored humidity data in the on-site environment of the gas to be analyzed, real-time adjusting the sampling frequency range of the infrared sensor and obtaining the sampling frequency range of the infrared sensor corresponding to the humidity data;

[0104] A frequency acquisition module, configured to adjust the sampling frequency of an external sensor in real time within the sampling frequency range of an infrared sensor corresponding to the humidity data, and acquire the sampling frequency of the infrared sensor that matches the humidity in the current on-site environment of the gas to be analyzed.

[0105] A concentration acquisition module, configured to perform gas sampling within the sampling frequency range of the infrared sensor, determine the output fixed frequency corresponding to the current infrared sensor according to the humidity data, extract the output signal corresponding to the output fixed frequency of the infrared sensor, perform Fourier transform processing on the output signal corresponding to the output fixed frequency, and perform reprocessing in combination with the mathematical model optical algorithm of the partial least squares method, and finally acquire the gas concentration value corresponding to the output signal.

[0106] The working principle of the above technical solution is as follows: First, the humidity detection module uses a humidity sensor to monitor the humidity data in the on-site environment of the gas to be analyzed in real time; then, the range acquisition module adjusts the sampling frequency range of the infrared sensor in real time according to the monitored humidity data in the on-site environment of the gas to be analyzed, and acquires the sampling frequency range of the infrared sensor corresponding to the humidity data; after that, the frequency acquisition module adjusts the sampling frequency of the external sensor in real time within the sampling frequency range of the infrared sensor corresponding to the humidity data, and acquires the sampling frequency of the infrared sensor that matches the humidity in the current on-site environment of the gas to be analyzed; finally, the concentration acquisition module performs gas sampling within the sampling frequency range of the infrared sensor, determines the output fixed frequency corresponding to the current infrared sensor according to the humidity data, extracts the output signal corresponding to the output fixed frequency of the infrared sensor, performs Fourier transform processing on the output signal corresponding to the output fixed frequency, and performs reprocessing in combination with the mathematical model optical algorithm of the partial least squares method, and finally acquires the gas concentration value corresponding to the output signal.

[0107] The effect of the above technical solution is as follows: A Fourier transform infrared gas analysis system proposed in this embodiment can detect the humidity data in the on-site environment of the gas to be analyzed, obtain the actual situation of the current humidity, and set the corresponding gas sampling frequency and the output fixed frequency of the infrared sensor according to the humidity situation in the on-site environment of the analyzed gas, so as to effectively improve the accuracy of gas concentration detection by matching the gas sampling and the output fixed frequency of the infrared sensor with the humidity situation of the gas mixed in the actual on-site environment of the analyzed gas.

[0108] In one embodiment of the present invention, the range acquisition module includes:

[0109] A comparison module, configured to compare the monitored humidity data in the on-site environment of the gas to be analyzed with a preset first humidity threshold and a second humidity threshold.

[0110] A range determination module, configured to determine the sampling frequency range of the infrared sensor according to the comparison result between the humidity data in the on-site environment of the gas to be analyzed and a preset first humidity threshold and a second humidity threshold;

[0111] Wherein, the humidity value corresponding to the second humidity threshold is higher than the humidity value corresponding to the first humidity threshold, and the specific settings of the first humidity threshold and the second humidity threshold need to be preset according to the gas environment to be measured, wherein the gas environment includes high humidity and low sulfur, ultra-high humidity (waste incineration) occasions, etc.

[0112] Wherein, the range determination module includes:

[0113] A first frequency range determination module, configured to determine the sampling frequency range of the infrared sensor as 300 Hz - 430 Hz when the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold;

[0114] A second frequency range determination module, configured to determine the sampling frequency range of the infrared sensor as 420 Hz - 540 Hz when the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold;

[0115] A third frequency range determination module, configured to determine the sampling frequency range of the infrared sensor as 470 Hz - 580 Hz when the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold.

[0116] The working principle and effects of the above technical solution are as follows: According to the fact that the data processing time of gases with different humidity doping amounts is different during the concentration analysis and detection process, by adjusting the range of gas sampling frequencies corresponding to different humidities, it is possible to effectively obtain the gas collection frequency with the best matching degree with the humidity doping in the current gas, so that the gas concentration data analysis can maintain an effective gas data analysis and processing time under different humidity doping amounts. Moreover, through the above setting of the range of gas sampling frequencies, when the water vapor humidity content doped in the gas gradually changes, the corresponding sampling frequency range can maximize the acquisition of gas samples with humidity change characteristics. Furthermore, during the gas analysis process, the collection efficiency and timeliness of the water vapor humidity in the gas that does not change can be improved, and then the gas collection frequency can be coordinated with the collection frequency of humidity detection. When the output fixed frequency corresponding to the current infrared sensor is adjusted according to the actual situation of humidity data detection, the matching degree between the adjusted output fixed frequency and the water vapor humidity doping amount in the gas collection can be maximized, thereby maximizing the accuracy of gas analysis and concentration detection. It can effectively prevent the situation that when the output fixed frequency corresponding to the infrared sensor has been adjusted, due to the unreasonable matching of the gas collection frequency, it is impossible to timely obtain a gas sample with the corresponding water vapor humidity doping amount that matches the current output fixed frequency. As a result, in the initial stage after the output fixed frequency is adjusted, accurate gas concentration analysis data cannot be obtained due to untimely gas collection.

[0117] In an embodiment of the present invention, the frequency acquisition module includes:

[0118] A first frequency adjustment module, which is used to set a first sampling frequency adjustment gradient when the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold, and within the sampling frequency range of 300 Hz - 430 Hz of the infrared sensor, starting from 300 Hz, adjust the sampling frequency of the infrared sensor upward to 430 Hz with the first sampling frequency adjustment gradient as the adjustment degree; wherein, the first sampling frequency adjustment gradient is obtained through the following formula:

[0119]

[0120] wherein, Q1 represents the first sampling frequency adjustment gradient; S 1y represents the first humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency basic parameter, and the value range of W0 is 12 Hz - 20 Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6 Hz - 12 Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data corresponding to the i-th humidity data acquisition;

[0121] Frequency adjustment module two is used to set a second sampling frequency adjustment gradient when the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, and within the sampling frequency range of 420Hz - 540Hz of the infrared sensor, starting from 420Hz, adjust the sampling frequency of the infrared sensor upward to 540Hz with the second sampling frequency adjustment gradient as the adjustment degree; wherein, the second sampling frequency adjustment gradient is obtained through the following formula:

[0122]

[0123] wherein, Q2 represents the second sampling frequency adjustment gradient; S 2y represents the second humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency basic parameter, and the value range of W0 is 12Hz - 20Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6Hz - 12Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data corresponding to the i-th humidity data acquisition.

[0124] Frequency adjustment module three is used to set a third sampling frequency adjustment gradient when the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, and within the sampling frequency range of 470Hz - 580Hz of the infrared sensor, starting from 470Hz, adjust the sampling frequency of the infrared sensor upward to 580Hz with the second sampling frequency adjustment gradient as the adjustment degree.

[0125] wherein, the third sampling frequency adjustment gradient is obtained through the following formula:

[0126]

[0127] wherein, Q3 represents the third sampling frequency adjustment gradient; S 3y represents the third humidity threshold; S represents the humidity data in the on-site environment of the gas to be analyzed currently monitored; W0 represents the sampling frequency basic parameter, and the value range of W0 is 12Hz - 20Hz; W1 represents the sampling frequency compensation parameter, and the value range of W1 is 6Hz - 12Hz; n represents the total number of humidity data acquisitions during the current humidity monitoring process; S i represents the humidity data corresponding to the i-th humidity data acquisition.

[0128] The effects of the above technical solutions are as follows: According to the fact that the data processing time of gases with different humidity doping amounts is different during the concentration analysis and detection process, by adjusting the range of gas sampling frequencies corresponding to different humidities, it is possible to effectively obtain the gas collection frequency with the best matching degree to the humidity doped in the current gas, so that the gas concentration data analysis can maintain an effective gas data analysis and processing time under different humidity doping amounts. Moreover, through the setting of the above gas sampling frequency range, when the water vapor humidity content doped in the gas gradually changes, the corresponding sampling frequency range can maximize the acquisition of gas samples with humidity change characteristics. Furthermore, during the gas analysis process, it can improve the collection efficiency and timeliness of the water vapor humidity mixed in the gas when it does not change, and then make the gas collection frequency match the collection frequency of humidity detection. When the output fixed frequency corresponding to the current infrared sensor is adjusted according to the actual situation of humidity data detection, it can maximize the matching degree between the adjusted output fixed frequency and the water vapor humidity doping amount in the gas collection, and thus maximize the accuracy of gas analysis and concentration detection. It can effectively prevent the situation where, when the output fixed frequency corresponding to the infrared sensor has been adjusted, due to the unreasonable matching of the gas collection frequency, it is impossible to timely obtain a gas sample with the corresponding water vapor humidity doping amount that matches the current output fixed frequency. As a result, in the initial stage after the output fixed frequency is adjusted, due to the untimely gas collection, it is impossible to obtain accurate gas concentration analysis data.

[0129] On the other hand, by combining the sampling frequency adjustment gradient obtained through the above formula with the actual situation of humidity data, it is possible to adaptively adjust the sampling frequency adjustment gradient according to the actual situation of humidity data, which can effectively improve the matching degree between the gas sampling frequency and the humidity change in the gas. By obtaining the gas sampling frequency with the highest matching degree during the humidity change process, it can maximize the gas analysis sampling efficiency. Moreover, in the case where the water vapor humidity doped in the gas is constantly changing, through the adjustment of the gas sampling frequency and the acquisition of the corresponding optimal frequency, it can maximize the capture of the effective value of the water vapor humidity doped in the gas sample during the gas humidity change process, effectively preventing the problem that when the humidity changes frequently, the low matching degree between the gas collection frequency and the humidity change leads to a low matching degree between the water vapor humidity data contained in the collected gas and the humidity value obtained by the humidity sensor, resulting in a low matching degree between the output fixed frequency of the infrared sensor and the actual situation of the gas sample, and thus leading to inaccurate gas analysis data.

[0130] In an embodiment of the present invention, the frequency acquisition module further includes:

[0131] A gas concentration detection module, which is used to observe and obtain the gas concentration value in real time during the sampling frequency adjustment process of the infrared sensor;

[0132] A frequency selection module, which is used to, after completing a sampling frequency adjustment from the starting point to the final value point of the frequency range within the sampling frequency range, take the sampling frequency corresponding to the floating range of the gas concentration value of the gas to be analyzed being less than 3.8% of the average gas concentration value as the infrared sensor sampling frequency matching the humidity in the current gas on-site environment;

[0133] Wherein, when the sampling frequencies corresponding to the floating range of the gas concentration value of the gas to be analyzed being less than 3.8% of the average gas concentration value are not unique, the maximum sampling frequency among the multiple sampling frequencies is taken as the infrared sensor sampling frequency matching the humidity in the current gas on-site environment.

[0134] The working principle of the above technical solution is as follows: First, during the sampling frequency adjustment of the infrared sensor, the gas concentration detection module observes and obtains the gas concentration value in real time; then, the frequency selection module, after completing a sampling frequency adjustment from the starting point to the final value point of the frequency range within the sampling frequency range, takes the sampling frequency corresponding to the floating range of the gas concentration value of the gas to be analyzed being less than 3.8% of the average gas concentration value as the infrared sensor sampling frequency matching the humidity in the current gas on-site environment;

[0135] The effect of the above technical solution is as follows: According to the different data processing times of gases with different humidity doping amounts during the concentration analysis and detection process, by adjusting the range of gas sampling frequencies corresponding to different humidities, the gas collection frequency with the best matching degree with the humidity doped in the current gas can be effectively obtained, so that the gas concentration data analysis can maintain an effective gas data analysis processing time under different humidity doping amounts. Moreover, through the above setting of the range of gas sampling frequencies, when the water vapor humidity content doped in the gas changes gradually, the corresponding sampling frequency range can maximize the acquisition of gas samples with humidity change characteristics. Furthermore, during the gas analysis process, the acquisition efficiency and timeliness of the gas samples without change in the water vapor humidity mixed in the gas can be improved. Thus, the gas collection frequency is coordinated with the collection frequency of humidity detection. When the output fixed frequency corresponding to the current infrared sensor is adjusted according to the humidity data detection situation, the matching degree between the adjusted output fixed frequency and the water vapor humidity doping amount in the gas collection is maximized, and thus the accuracy of gas analysis and concentration detection is maximized. It effectively prevents the situation that, when the output fixed frequency corresponding to the infrared sensor has been adjusted, due to the unreasonable matching of the gas collection frequency, it is impossible to timely obtain a gas sample with the corresponding water vapor humidity doping amount matching the current output fixed frequency. As a result, in the initial stage after the adjustment of the output fixed frequency, accurate gas concentration analysis data cannot be obtained due to untimely gas collection.

[0136] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A Fourier transform infrared gas analysis method, characterized in that, The Fourier transform infrared gas analysis method is based on an infrared gas analyzer for gas analysis. The infrared gas analyzer includes a humidity sensor, an infrared sensor, and a core processor. The Fourier transform infrared gas analysis method includes: Real-time monitoring of the humidity data in the on-site environment of the gas to be analyzed through the humidity sensor; According to the monitored humidity data in the on-site environment of the gas to be analyzed, the sampling frequency range of the infrared sensor is adjusted in real time to obtain the sampling frequency range of the infrared sensor corresponding to the humidity data; Within the sampling frequency range of the infrared sensor corresponding to the humidity data, the sampling frequency of the external sensor is adjusted in real time; the sampling frequency of the infrared sensor matching the humidity in the current on-site environment of the gas to be analyzed is obtained; Gas sampling is carried out within the sampling frequency range of the infrared sensor, and the output fixed frequency corresponding to the current infrared sensor is determined according to the humidity data. The output signal corresponding to the output fixed frequency is extracted, and the output signal corresponding to the output fixed frequency is subjected to Fourier transform processing, and then reprocessed by the optical algorithm of the mathematical model combining partial least squares method, and finally the gas concentration value corresponding to the output signal is obtained; Among them, obtaining the sampling frequency of the infrared sensor matching the humidity in the current on-site environment of the gas to be analyzed includes: During the adjustment process of the sampling frequency of the infrared sensor, the gas concentration values obtained are observed in real time; When a sampling frequency adjustment from the starting point to the final value point of the frequency range is completed within the sampling frequency range, the sampling frequency corresponding to the gas concentration value floating range of the gas to be analyzed being less than 3.8% of the gas concentration average value is used as the sampling frequency of the infrared sensor matching the humidity in the current gas on-site environment; Among them, when the sampling frequencies corresponding to the gas concentration value floating range of the gas to be analyzed being less than 3.8% of the gas concentration average value are not unique, the maximum sampling frequency among the multiple sampling frequencies is used as the sampling frequency of the infrared sensor matching the humidity in the current gas on-site environment.

2. The Fourier transform infrared gas analysis method according to claim 1, characterized in that According to the monitored humidity data in the on-site environment of the gas to be analyzed, adjusting and obtaining the sampling frequency range of the infrared sensor in real time includes: Comparing the monitored humidity data in the on-site environment of the gas to be analyzed with a preset first humidity threshold and a second humidity threshold; Determining the sampling frequency range of the infrared sensor through the comparison results of the humidity data in the on-site environment of the gas to be analyzed with the preset first humidity threshold and second humidity threshold; Among them, the humidity value corresponding to the second humidity threshold is higher than the humidity value corresponding to the first humidity threshold.

3. The Fourier transform infrared gas analysis method according to claim 2, characterized in that Determining the sampling frequency range of the infrared sensor through the comparison results of the humidity data in the on-site environment of the gas to be analyzed with the preset first humidity threshold and second humidity threshold includes: When the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold, the sampling frequency range of the infrared sensor is 300 Hz - 430 Hz; When the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, the sampling frequency range of the infrared sensor is 420 Hz - 540 Hz; When the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, the sampling frequency range of the infrared sensor is 470 Hz - 580 Hz.

4. The Fourier transform infrared gas analysis method according to claim 1, wherein Within the sampling frequency range of the infrared sensor corresponding to the humidity data, the sampling frequency of the external sensor is adjusted in real time, including: When the humidity data in the on-site environment of the gas to be analyzed is lower than the first humidity threshold, set the first sampling frequency adjustment gradient, and within the sampling frequency range of 300 Hz - 430 Hz of the infrared sensor, starting from 300 Hz, adjust the sampling frequency of the infrared sensor upward to 430 Hz with the first sampling frequency adjustment gradient as the adjustment degree; When the humidity data in the on-site environment of the gas to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, set the second sampling frequency adjustment gradient, and within the sampling frequency range of 420 Hz - 540 Hz of the infrared sensor, starting from 420 Hz, adjust the sampling frequency of the infrared sensor upward to 540 Hz with the second sampling frequency adjustment gradient as the adjustment degree; When the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, set the third sampling frequency adjustment gradient, and within the sampling frequency range of 470 Hz - 580 Hz of the infrared sensor, starting from 470 Hz, adjust the sampling frequency of the infrared sensor upward to 580 Hz with the second sampling frequency adjustment gradient as the adjustment degree.

5. A Fourier transform infrared gas analysis system, characterized in that, The Fourier transform infrared gas analysis system performs gas analysis based on an infrared gas analyzer, and the infrared gas analyzer includes a humidity sensor, an infrared sensor, and a core processor. The Fourier transform infrared gas analysis system includes: A humidity detection module for real-time monitoring of the humidity data in the on-site environment of the gas to be analyzed through the humidity sensor; A range acquisition module for adjusting the sampling frequency range of the infrared sensor in real time according to the monitored humidity data in the on-site environment of the gas to be analyzed, and obtaining the sampling frequency range of the infrared sensor corresponding to the humidity data; A frequency acquisition module for adjusting the sampling frequency of the external sensor in real time within the sampling frequency range of the infrared sensor corresponding to the humidity data; obtaining the sampling frequency of the infrared sensor that matches the current humidity in the on-site environment of the gas to be analyzed; A concentration acquisition module for performing gas sampling within the sampling frequency range of the infrared sensor, determining the output fixed frequency corresponding to the current infrared sensor according to the humidity data, extracting the output signal corresponding to the output fixed frequency of the infrared sensor, performing Fourier transform processing on the output signal corresponding to the output fixed frequency, and then performing reprocessing in combination with the mathematical model optical algorithm of partial least squares method to finally obtain the gas concentration value corresponding to the output signal; The frequency acquisition module further includes: A gas concentration detection module, which is used to observe the obtained gas concentration value in real time during the sampling frequency adjustment process of the infrared sensor; A frequency selection module, which is used to, when a sampling frequency adjustment from the starting point to the final value point of the frequency range is completed within the sampling frequency range, take the sampling frequency corresponding to the gas concentration value fluctuation range of the gas to be analyzed being less than 3.8% of the gas concentration average value as the sampling frequency of the infrared sensor matching the humidity in the current gas on-site environment; Among them, when the sampling frequency corresponding to the gas concentration value fluctuation range of the gas to be analyzed being less than 3.8% of the gas concentration average value is not unique, the maximum sampling frequency among the multiple sampling frequencies is taken as the sampling frequency of the infrared sensor matching the humidity in the current gas on-site environment.

6. The Fourier transform infrared gas analysis system according to claim 5, wherein The range acquisition module includes: A comparison module, which is used to compare the monitored humidity data in the gas on-site environment to be analyzed with a preset first humidity threshold and a second humidity threshold; A range determination module, which is used to determine the sampling frequency range of the infrared sensor through the comparison results of the humidity data in the gas on-site environment to be analyzed with the preset first humidity threshold and second humidity threshold; Among them, the humidity value corresponding to the second humidity threshold is higher than the humidity value corresponding to the first humidity threshold.

7. The Fourier transform infrared gas analysis system according to claim 6, wherein, The range determination module includes: A frequency range determination module one, which is used to, when the humidity data in the gas on-site environment to be analyzed is lower than the first humidity threshold, determine the sampling frequency range of the infrared sensor as 300Hz - 430Hz; A frequency range determination module two, which is used to, when the humidity data in the gas on-site environment to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, determine the sampling frequency range of the infrared sensor as 420Hz - 540Hz; A frequency range determination module three, which is used to, when the humidity data in the gas on-site environment to be analyzed is higher than the second humidity threshold, determine the sampling frequency range of the infrared sensor as 470Hz - 580Hz.

8. The Fourier transform infrared gas analysis system according to claim 5, characterized in that, The frequency acquisition module includes: A frequency adjustment module one, which is used to, when the humidity data in the gas on-site environment to be analyzed is lower than the first humidity threshold, set a first sampling frequency adjustment gradient, and within the sampling frequency range of 300Hz - 430Hz of the infrared sensor, starting from 300Hz, adjust the sampling frequency of the infrared sensor upward to 430Hz with the first sampling frequency adjustment gradient as the adjustment degree; A frequency adjustment module two, which is used to, when the humidity data in the gas on-site environment to be analyzed is higher than the first humidity threshold and lower than the second humidity threshold, set a second sampling frequency adjustment gradient, and within the sampling frequency range of 420Hz - 540Hz of the infrared sensor, starting from 420Hz, adjust the sampling frequency of the infrared sensor upward to 540Hz with the second sampling frequency adjustment gradient as the adjustment degree; The frequency adjustment module three is used to set a third sampling frequency adjustment gradient when the humidity data in the on-site environment of the gas to be analyzed is higher than the second humidity threshold, and within the sampling frequency range of 470Hz - 580Hz of the infrared sensor, starting from 470Hz, adjust the sampling frequency of the infrared sensor upward to 580Hz with the second sampling frequency adjustment gradient as the adjustment degree.

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