Method for testing performance of infrared spectrum video equipment

Abstract

The embodiment of the present application provides a kind of infrared spectrum video equipment performance inspection method, belong to infrared spectrum imaging technical field.The method comprises: starting infrared spectrum video control platform and infrared spectrum video equipment, obtain the field of view of infrared spectrum video equipment;Select acquisition area in the field of view of infrared spectrum video equipment;Based on the gas and its concentration required by performance inspection, the gas is filled into the measurement gas chamber of the infrared spectrum video control platform;Adjust the infrared spectrum video control platform to simulate the environment required by performance inspection;Collect the first response value of the infrared spectrum video equipment under the environment;And based on the first response value, calculate the performance inspection result of the infrared spectrum video equipment.The method is used to solve the problem that the existing technology exists for infrared spectrum video equipment in different concentration different temperature gas performance inspection there are a variety of possible errors.

Description

Technical Field

[0001] This invention relates to the field of infrared spectral imaging technology, and more specifically to a method for testing the performance of infrared spectral video equipment. Background Technology

[0002] As a leading global chemical producer, my country still faces a severe safety situation in its production processes. Against this backdrop, developing efficient and precise gas leak monitoring technologies is particularly important. Infrared spectral video imaging technology, as an innovative solution in this field, deeply integrates advanced infrared spectral analysis with intelligent video surveillance technology to construct a comprehensive monitoring system with real-time monitoring, rapid identification, and intelligent early warning functions. This technology enables visual tracking and precise location of leaked gases, providing a scientific basis for emergency response decisions and effectively improving the inherent safety level of chemical enterprises.

[0003] The performance of infrared spectral video equipment used in infrared spectral imaging technology has a significant impact on gas imaging and detection. Existing performance testing methods for infrared spectral video measurement and control systems are based on thermal imagers, with measurement units of ppm·m or vol%·m, and performance indicators such as noise equivalent temperature difference (NETD), minimum resolvable temperature difference (MRTD), minimum detectable temperature difference (MDTD), and maximum temperature range.

[0004] However, existing measurement units for gases do not take into account environmental factors such as gas temperature and background radiation, leading to errors in the measurement results. Furthermore, existing performance indicators are poorly correlated with measurement units, failing to accurately reflect the sensitivity and performance testing capabilities of simulated infrared spectroscopy video equipment for gases of varying concentrations under different ambient temperatures. Therefore, verifying the performance of infrared spectroscopy video equipment based on existing performance indicators suffers from incomplete testing methods and insufficient detection scenarios, resulting in various potential errors in the performance testing of infrared spectroscopy video equipment for gases of different concentrations and temperatures.

[0005] Therefore, the measurement units and performance testing of existing infrared spectroscopy video equipment have certain deficiencies. Summary of the Invention

[0006] The purpose of this invention is to provide a method for testing the performance of infrared spectroscopy video equipment, in order to solve the problem that existing technologies have multiple possible errors in testing the gas performance of infrared spectroscopy video equipment at different concentrations and temperatures.

[0007] To achieve the above objectives, embodiments of the present invention provide a method for performance testing of an infrared spectral video device. The method includes: starting an infrared spectral video measurement and control platform and an infrared spectral video device to obtain the field of view of the infrared spectral video device; selecting a collection area within the field of view of the infrared spectral video device; filling the measurement gas chamber of the infrared spectral video measurement and control platform with the gas required for performance testing and its concentration; adjusting the infrared spectral video measurement and control platform to simulate the environment required for performance testing; collecting a first response value of the infrared spectral video device under the environment; and calculating the performance testing result of the infrared spectral video device based on the first response value. The performance testing includes zero-point calculation, range testing, indication error calculation, sensitivity detection, detection limit detection, repeatability testing, and / or drift testing.

[0008] Optionally, selecting a collection area in the field of view of the infrared spectral video device includes: selecting a preliminary area, wherein the preliminary area is the area where the surface radiation source-side filter is located in the field of view; determining the center position of the preliminary area; and obtaining the collection area based on the center position and a preset size, wherein the collection area is located inside the preliminary area.

[0009] Optionally, the first response value of the infrared spectral video device in the environment includes: obtaining the pixel value of each pixel in the acquisition area based on a preset acquisition duration and a preset first acquisition frequency; calculating the average value of the total acquired pixel values; and converting the average value of the pixel values ​​into a standard volume to obtain the first response value.

[0010] Optionally, the gas required for the performance test includes: a test gas, including the test gas specified by the infrared spectroscopy video device or the test gas selected according to the device type of the infrared spectroscopy video device, wherein the device type includes refrigerated and unrefrigerated devices; and a zero-point gas, including clean air or nitrogen, wherein the clean air is air that does not contain the test gas.

[0011] Optionally, based on the gas and its concentration required for performance testing, filling the measuring gas chamber of the infrared spectral video measurement and control platform with the gas includes: if the required gas is the gas to be tested, adjusting the first flow controller and the second flow controller in the infrared spectral video measurement and control platform to obtain the gas to be tested at the required concentration in the gas mixer, and then introducing the gas in the gas mixer into the measuring gas chamber; and if the required gas is a zero-point gas, adjusting the second flow controller in the infrared spectral video measurement and control platform to obtain the zero-point gas, and then introducing the zero-point gas into the measuring gas chamber.

[0012] Optionally, the zero-point calculation includes: filling the measurement gas chamber of the infrared spectral video measurement and control platform with the zero-point gas, while adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure; adjusting the surface radiation source temperature to a preset first surface radiation source temperature; and acquiring a first response value based on a preset first acquisition number and taking the average value to obtain the zero point of the device.

[0013] Optionally, the range test includes: adjusting the surface radiation source temperature to a preset first surface radiation source temperature; filling the gas to be tested into the measurement chamber of the infrared spectral video measurement and control platform, adjusting the gas temperature to a preset first gas temperature and continuously increasing the concentration of the gas to be tested in the measurement chamber until the response value of the infrared spectral video device no longer changes; acquiring the first response value as the full-scale response value; calculating the full-scale standard volume of the gas cloud of the gas to be tested in the measurement chamber; and obtaining the result of the range test based on the full-scale response value and the full-scale standard volume of the gas cloud, i.e., the correspondence between the full-scale response value and the full-scale standard volume of the gas cloud, wherein the calculation formula for the full-scale standard volume of the gas cloud is:

[0014]

[0015] in, The full-scale standard volume of the gas cloud. To measure the length of the air chamber, This refers to the horizontal field of view of the infrared lens. This refers to the vertical field of view of the infrared lens. The furthest imaging distance, This is the concentration corresponding to the full-scale standard volume of the gas cloud.

[0016] Optionally, the calculation of the indication error includes: within the concentration range corresponding to the standard volume of the gas cloud from 0 to full scale, selecting no less than three concentrations of the gas to be tested based on a certain concentration interval, and performing the following operations for each selected gas: filling the gas to be tested into the measuring gas chamber of the infrared spectral video measurement and control platform, while adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure; adjusting the gas temperature and the surface radiation source temperature to two different groups, wherein the gas temperature of the first group is the preset first gas temperature and the surface radiation source temperature is the preset first surface radiation source temperature, and the gas temperature of the second group is the preset second gas temperature and the surface radiation source temperature is the preset second surface radiation source temperature; acquiring a first response value for each group based on a preset first acquisition number and taking the average value; calculating the error value for each group; and selecting the error value with the largest absolute value among all the calculated error values ​​as the indication error, wherein the calculation formula for the error value of each group is:

[0017]

[0018]

[0019] in, This is the error value calculated for this group. This is the average value calculated for this group. To measure the standard volume of the gas to be tested in the gas chamber, The concentration of the gas to be measured. The diameter of the filter window of the infrared spectral video measurement and control platform is [missing information]. The distance between the infrared spectral video device and the filter window.

[0020] Optionally, the sensitivity detection includes: selecting test gases with preset first and second concentrations respectively, and performing the following operations for each selected test gas: filling the test gas into the measuring gas chamber of the infrared spectral video measurement and control platform, while adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure; adjusting the surface radiation source temperature to a preset second surface radiation source temperature; acquiring a first response value based on a preset first number of acquisitions and taking the average value; and calculating the sensitivity based on the calculated average value, using the following formula:

[0021]

[0022] in, For sensitivity, This is the average value of the first response corresponding to a preset first concentration of the gas to be tested. This is the average value of the first response corresponding to a preset second concentration of the test gas. The standard volume of the gas to be measured in the time chamber is set to a preset first concentration of the gas to be measured. The standard volume of the gas to be tested in the time-measuring chamber is set to a second preset concentration of the gas to be tested.

[0023] Optionally, the detection limit detection includes: filling the measurement gas chamber of the infrared spectral video measurement and control platform with the zero-point gas, while adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure; adjusting the gas temperature and the surface radiation source temperature to maintain a preset temperature difference between them; acquiring a first response value based on a preset second acquisition frequency and a preset second acquisition number, and calculating the system noise using the following formula:

[0024]

[0025] in, For system noise, To preset the second number of data collections, This is the first response value from a single data collection. for The average value of the first response value collected in each acquisition; and the detection limit calculated based on the sensitivity and the system noise. The calculation formula is:

[0026]

[0027] in, j The preset discrimination coefficients.

[0028] Optionally, the repeatability test includes: repeatedly performing the following operations based on a preset third number of acquisitions: filling the measurement gas chamber of the infrared spectroscopy video measurement and control platform with a selected preset second concentration of the gas to be tested, while adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure; adjusting the gas temperature to a preset second gas temperature and adjusting the surface radiation source temperature to a preset second surface radiation source temperature; acquiring a first response value; removing the gas to be tested; and calculating the relative standard deviation based on the acquired first response value, using the following formula:

[0029]

[0030] in, The relative standard deviation, To preset the third collection number, For the first The first response value collected. for The average of the first response values ​​collected each time.

[0031] Optionally, the drift test includes: continuously running the infrared spectral video equipment for a preset time, and repeatedly performing the following operations based on a preset third acquisition frequency during the preset time: filling the measurement gas chamber of the infrared spectral video measurement and control platform with the zero-point gas, while adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure; adjusting the gas temperature to a preset second gas temperature and adjusting the surface radiation source temperature to a preset second surface radiation source temperature; acquiring a first response value, recorded as the zero-point response value; replacing the zero-point gas with a test gas of a preset third concentration, adjusting the gas temperature to a preset second gas temperature and adjusting the surface radiation source temperature to a preset third surface radiation source temperature; acquiring a first response value, recorded as the test response value; removing the test gas; calculating the zero-point drift corresponding to each zero-point response value based on the acquired zero-point response values, and selecting the largest zero-point drift as the zero-point drift of the equipment, wherein the calculation formula for the zero-point drift corresponding to each zero-point response value is:

[0032]

[0033] in, For the number of data collections, for The corresponding zero-point drift, This is the zero-point response value from a single data acquisition. This is the zero-point response value collected during the first sampling. The full-scale standard volume of the gas cloud is defined; and based on the collected zero-point response value and test response value, the range drift corresponding to each test response value is calculated, and the largest calculated range drift is selected as the range drift of the device. The calculation formula for the range drift corresponding to each test response value is as follows:

[0034]

[0035] in, for The corresponding range drift, This is the test response value collected in a single instance. This is the test response value collected for the first time.

[0036] The above technical solution takes into account the effects of gas temperature and surface radiation source temperature when performing performance testing on infrared spectroscopy video equipment. Utilizing an infrared spectroscopy video measurement and control platform to simulate gas concentration and the required environment allows for more convenient and accurate evaluation of the infrared spectroscopy video equipment system performance. This helps avoid problems such as imperfect testing methods and insufficient detection scenarios in existing performance testing methods, and reduces various possible errors that may occur when testing the gas performance of infrared spectroscopy video equipment at different concentrations and temperatures.

[0037] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0038] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0039] Figure 1 This is a schematic diagram of the structure of the infrared spectral video measurement and control platform provided in an embodiment of the present invention;

[0040] Figure 2 This is a flowchart illustrating the method for constructing measurement units in infrared spectral video equipment according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of the three-layer infrared radiation transmission model provided in the embodiment of the present invention;

[0042] Figure 4This is a flowchart illustrating the method for testing the performance of infrared spectral video equipment provided in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the acquisition area provided in an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures

[0045] 1. Infrared spectroscopy video equipment; 2. Independent gas measurement chamber

[0046] 3 blackbody light source 4 clip

[0047] 5. Filter element; 6. Hazardous gas concentration detector

[0048] 7 Temperature transmitter 8 Pressure transmitter

[0049] 9. Integrated heating and cooling unit; 10. Gas storage tank to be tested.

[0050] 11 Inert dilution gas or air storage tank 12 Pressure regulating valve

[0051] 13 Filter 14a First Flow Controller

[0052] 14b Second Flow Controller; 15 Hazardous Gas Injection Valve

[0053] 16 Gas mixing line 17 Venting and circulation line

[0054] 18 Exhaust line 19 Pressure control valve

[0055] 20 Safety valve 21 Gas absorption device

[0056] 22 Gas mixer 23 Heat exchanger

[0057] 24 Vacuum pump 25 Gas filling line

[0058] 26 Control terminal 27 Oxygen concentration detector

[0059] 28. Inert dilution gas or air filling valve Detailed Implementation

[0060] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0061] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with relevant laws and regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0062] To address the issue of existing measurement units failing to consider environmental factors, this invention proposes a new measurement unit for infrared spectral video equipment. When constructing this measurement unit, an infrared spectral video measurement and control platform is used for data acquisition.

[0063] Figure 1 This is a schematic diagram of the structure of the infrared spectral video measurement and control platform provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the platform has a detachable independent measuring chamber 2 between the blackbody light source 3 and the infrared spectral video device 1. By combining different numbers of independent measuring chambers 2, measuring chambers of different lengths can be obtained, which solves the problems of short adjustable distance or fixed length of the chamber in the prior art. By using a series of subsystems such as air intake, replacement, circulation, heating and safe discharge, the platform’s automated operation is improved, which greatly meets the needs of simulation testing in multiple occasions and can greatly improve the accuracy of evaluation and calibration of the performance of the infrared spectral video device 1.

[0064] Figure 2 This is a flowchart illustrating the method for constructing measurement units in infrared spectral video equipment according to an embodiment of the present invention, as shown below. Figure 2 As shown, the method includes steps S101 to S106.

[0065] Step S101: Based on the set multiple gas concentrations, gas temperatures and surface radiation source temperatures, obtain multiple combinations of gas concentrations, gas temperatures and surface radiation source temperatures.

[0066] Step S102: Based on each combination and the pre-established three-layer infrared radiation transmission model, obtain the theoretical radiation intensity received by the infrared spectral video device corresponding to each combination, and denot it as the first correspondence.

[0067] Step S103: Collect the pixel values ​​of the infrared spectral video devices at the temperature of each of the surface radiation sources, and calculate the corresponding integrated radiation intensity.

[0068] Step S104: Fit each pixel value and the integrated radiant intensity to obtain a second correspondence between pixel values ​​and integrated radiant intensity.

[0069] Step S105: Based on the first and second correspondences, obtain the pixel value corresponding to each combination, thereby obtaining the third correspondence between pixel value and gas concentration under different gas temperatures and surface radiation source temperatures.

[0070] Step S106: Convert the gas concentration in the third correspondence into a standard volume, thereby completing the construction of the measurement unit of the infrared spectral video device. The measurement unit is a standard volume, which represents the standard volume of the gas corresponding to the pixel value of the gas detected by the infrared spectral video device.

[0071] The measurement unit of the infrared spectral video device proposed in this invention converts the received pixel values ​​into a standard volume of gas. Based on this measurement unit, different measurement results can be obtained for the pixel values ​​of gas detected at different gas temperatures and surface radiation source temperatures, thereby helping to avoid errors in the infrared spectral video device when detecting gases of different concentrations in different environments.

[0072] Furthermore, the standard volume is sL or Nm. 3 .

[0073] In some embodiments of the present invention, the set plurality of gas concentrations, gas temperatures, and surface radiation source temperatures include: the plurality of gas concentrations including 0.1%, 0.25%, 0.5%, and 0.75%; the plurality of gas temperatures including a plurality of gas temperatures divided based on a preset first interval within the range of -20°C to 50°C; and the plurality of surface radiation source temperatures including a plurality of gas temperatures divided based on a preset second interval within the range of 0°C to 50°C.

[0074] The first interval can be set to 12.5℃, and the second interval can be set to 10℃. The settings of gas concentration, gas temperature, and surface radiation source temperature can be adjusted according to actual conditions and are not limited to the settings proposed in this invention.

[0075] Furthermore, the pixel value of the infrared spectral video device is the average value of the total pixel values ​​collected by the infrared spectral device based on a preset acquisition duration, a preset first acquisition frequency, and a preset acquisition area.

[0076] Figure 3 This is a schematic diagram of the structure of the three-layer infrared radiation transmission model provided in the embodiment of the present invention, as shown below. Figure 3 As shown, this three-layer infrared radiation transfer model is a simplification of the multi-layer infrared radiation transfer model. Figure 3As shown, the central element is a sealed air chamber, with surface radiation sources serving as the background and infrared spectral video equipment for receiving radiation at either end. The sealed air chamber is divided into three layers. The model assumes that the entire path between the background and the infrared spectral video equipment can be divided into a series of parallel layers, with each layer calculating the input radiation intensity of the preceding layer and the output radiation intensity of the following layer. For a single layer... Its output radiation intensity It is a function of wavelength and temperature, derived from the previous layer. Radiation absorption and the first The radiation emission of the layers is determined by the three-layer infrared radiation transmission model:

[0077]

[0078] in,

[0079]

[0080] in, The radiation intensity (W / m²) received by the infrared spectral video equipment. For the first The transmittance of the layer, For the first Radiation intensity of the layer (W / m²). For the first Temperature of the layer (K) and The first and third layers represent the filters at both ends of the measurement chamber of the infrared spectroscopy video measurement and control platform, respectively. The layer representing the gas. The layer where the surface radiation source is located; The absorption coefficient of the gas; Gas concentration; The measurement chamber length (m) of the infrared spectral video measurement and control platform; Let be Planck's first constant, and be... ; Here is Planck's second constant, which is ; The wavelength selected within the radiation band of the surface radiation source.

[0081] When performing calculations based on the three-layer infrared radiation transmission model, the transmittance of the filter and the gas, as well as the absorption coefficient of the gas, can be obtained by consulting existing technologies; since the filter at both ends of the measuring gas chamber is in direct contact with the gas, the temperature of the filter is the same as the temperature of the gas.

[0082] Furthermore, based on each of the aforementioned combinations and the pre-established three-layer infrared radiation transmission model, the theoretical radiation intensity received by the infrared spectral video device corresponding to each of the aforementioned combinations is obtained by: selecting multiple wavelengths in the radiation band of the surface radiation source based on a preset step size; and for each of the aforementioned combinations, performing the following operations: substituting the gas concentration, gas temperature, surface radiation source temperature, and the multiple wavelengths in the combination into the three-layer infrared radiation transmission model to obtain the radiation intensity received by the infrared spectral video device corresponding to the multiple wavelengths; and integrating the radiation intensity received by the infrared spectral video device corresponding to the multiple wavelengths to obtain the theoretical radiation intensity received by the infrared spectral video device corresponding to the combination.

[0083] In some embodiments of the present invention, the wavelength range of the surface radiation source is 9.4 μm to 11.7 μm. To improve the accuracy of integration, the step size should be set as small as possible, such as 0.00001 μm. Therefore, the selected wavelengths are 9.40000 μm, 9.40001 μm, 9.40001 μm, ..., 11.70000 μm. For a given combination of gas concentration, gas temperature, and surface radiation source temperature, multiple wavelengths are calculated. Then, using adjacent wavelengths as upper and lower limits, the calculated multiple Integrating the data yields the theoretical radiation intensity received by the infrared spectral video device corresponding to this combination.

[0084] To eliminate the influence of optical path length (air chamber length) and air on radiation intensity, the surface radiation source is directly placed in close contact with the infrared spectral video device 1, and the temperature of the surface radiation source is adjusted. The corresponding pixel values ​​of the infrared spectral video device 1 are then collected, allowing for a more accurate correlation between pixel values ​​and actual radiation intensity. The actual radiation intensity corresponding to each surface radiation source temperature can be calculated using integration. The calculation method for the integrated radiation intensity corresponding to each surface radiation source temperature includes: calculating the integrated radiation intensity based on the integrated radiation intensity formula, where the integrated radiation intensity formula is:

[0085]

[0086] in, and These represent the two endpoints of the radiation band of the surface radiation source. When the band of the surface radiation source is 9.4 μm to 11.7 μm, The value is 9.4 μm. The value is 11.7 μm; The surface radiation source temperature (K); The Stefan-Boltzmann constant is . ; The integral radiation intensity (W / m²) of the surface radiation source. For band 0 to The proportion of radiation in the entire spectrum can be obtained through calculation or by looking up the blackbody radiation function table, as shown in Table 1.

[0087] Table 1 Radiation Function Table of Surface Radiation Sources

[0088]

[0089] Obtained through calculation At that time, the band 0 to The formula for calculating the proportion of radiation in the entire wavelength band is:

[0090] .

[0091] Furthermore, converting the gas concentration in the third correspondence into a standard volume includes: substituting the gas concentrations at different gas temperatures and surface radiation source temperatures into the standard volume formula to calculate the standard volume, wherein the standard volume formula is:

[0092]

[0093] in, Standard volume (scm) For gas concentration, The diameter (m) of the filter window of the infrared spectral video measurement and control platform. This represents the distance (in meters) between the infrared spectral video equipment and the filter window. It should be noted that scm and Nm are different. 3 They have the same meaning, both representing standard cubic meters.

[0094] This invention also provides an infrared spectral video device, wherein the measurement unit of the device is a standard volume, and the measurement unit is constructed based on any of the methods described herein.

[0095] This invention also provides a method for measuring the standard volume of a gas, the method being executed by an infrared spectroscopy video device, the method comprising the following steps S201 to S204.

[0096] Step S201: Convert the radiation in the acquisition area into pixel values, wherein the acquisition area includes unknown gas.

[0097] Step S202: Based on the radiation band of the surface radiation source, the gas temperature, and the surface radiation source temperature, calculate the integrated radiation intensity of the surface radiation source. The integrated radiation intensity received by the infrared spectral video equipment And the integrated radiation intensity corresponding to the temperature of the radiation emitted by the filters at both ends of the measuring chamber. and .

[0098] Step S203: Calculate the results , , and Substituting the values ​​into the inversion model of the three-layer infrared radiative transfer model, the concentration of the unknown gas is calculated. The inversion model is as follows:

[0099]

[0100] in, The concentration of the unknown gas. denoted as the absorption coefficient of the gas.

[0101] Step S204: Convert the concentration of the unknown gas into a standard volume based on the standard volume formula.

[0102] It should be noted that when using infrared spectroscopy video equipment for actual measurements, and calculating the individual integrated radiant intensities using the integrated radiant intensity formula, the surface radiation source temperature is the measured background temperature. The temperature received by the infrared spectroscopy video equipment is the measurement value taken when the gas is present. The temperatures of the radiation emitted by the filters at both ends of the gas chamber are taken as ambient temperatures. and All values ​​are constants, for example, all values ​​are 1. This represents the distance between the infrared spectral video equipment and the actual background. This formula is more suitable for testing equipment performance in a laboratory environment. In practical applications, the environment is more complex and factors such as airborne solid particles and water vapor need to be considered. To obtain more accurate results, adjustments can be made according to the actual environment.

[0103] Figure 4 This is a flowchart illustrating the method for testing the performance of infrared spectral video equipment provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the method includes the following steps S301-S306.

[0104] Step S301: Start the infrared spectral video measurement and control platform and the infrared spectral video equipment to obtain the field of view of the infrared spectral video equipment.

[0105] Step S302: Select the acquisition area in the field of view of the infrared spectral video device.

[0106] Step S303: Based on the gas and its concentration required for performance testing, the gas is filled into the measurement gas chamber of the infrared spectral video measurement and control platform.

[0107] Step S304: Adjust the infrared spectral video measurement and control platform to simulate the environment required for performance testing.

[0108] Step S305: Collect the first response value of the infrared spectral video device in the environment.

[0109] Step S306: Based on the first response value, calculate the performance test result of the infrared spectral video device.

[0110] The performance testing includes zero-point calculation, range testing, indication error calculation, sensitivity detection, detection limit detection, repeatability testing, and / or drift testing.

[0111] It should be noted that during performance testing, the test environment should be kept at a constant temperature. The infrared spectroscopy video equipment should be started for at least 10 minutes before the test. The core temperature should be continuously recorded during the test. For uncooled infrared spectroscopy video equipment, the core temperature should be kept stable.

[0112] The measurement unit proposed in this invention is closely related to gas temperature and surface radiation source temperature. When performing performance testing on infrared spectroscopy video equipment using this measurement unit, the influence of gas temperature and surface radiation source temperature must be considered. The performance testing method for infrared spectroscopy video equipment proposed in this invention utilizes an infrared spectroscopy video measurement and control platform to simulate gas concentration and the required environment. This allows for more convenient and accurate evaluation of the system performance of infrared spectroscopy video equipment, helping to avoid problems such as imperfect testing methods and insufficient detection scenarios in existing performance testing methods. It also reduces various possible errors that exist when testing the gas performance of infrared spectroscopy video equipment at different concentrations and temperatures.

[0113] Furthermore, selecting the acquisition area within the field of view of the infrared spectral video device includes: selecting a preliminary area, wherein the preliminary area is the region where the surface radiation source-side filter is located in the field of view; determining the center position of the preliminary area; and obtaining the acquisition area based on the center position and a preset size. The acquisition area is located within the preliminary area.

[0114] Figure 5 This is a schematic diagram of the acquisition area provided in an embodiment of the present invention, such as... Figure 5 As shown, in the field of view of the infrared spectral video equipment, the center of the filter outline on the surface radiation source side is determined as the center of a circle. Then, according to a preset diameter, such as 10cm, the acquisition area is obtained. Alternatively, the acquisition area can be obtained by directly using the filter outline on the surface radiation source side as the outer circumference.

[0115] Furthermore, acquiring the first response value of the infrared spectral video device in the environment includes: obtaining the pixel value of each pixel point in the acquisition area based on a preset acquisition duration and a preset first acquisition frequency; calculating the average value of the total acquired pixel values; and converting the average value of the pixel values ​​into a standard volume to obtain the first response value.

[0116] It should be noted that data should be collected only after the environment has stabilized for at least 45 seconds. The preset data collection duration should be no less than 2 seconds, and the preset first data collection frequency should be no less than 1 time / second.

[0117] Furthermore, the gases required for the performance test include: a test gas, including the test gas specified by the infrared spectroscopy video equipment or a test gas selected according to the equipment type of the infrared spectroscopy video equipment, wherein the equipment type includes refrigerated and unrefrigerated equipment; and a zero-point gas, including clean air or nitrogen, wherein the clean air is air without the test gas. The test gas can be methane, ethane, ethylene, or propylene. If the equipment does not specify the type of gas to be tested, refrigerated equipment can use methane gas standard material, and unrefrigerated equipment can use ethylene gas standard material. The concentration of the standard material is between 0.1% and 100% LEL (lower explosive limit). The gas can be directly charged into the test gas storage tank 10 to obtain the required concentration, or the test gas storage tank 10 in the infrared spectroscopy video monitoring and control platform can be mixed with the gas in the inert dilution gas or air storage tank 11 to obtain the required concentration.

[0118] Furthermore, based on the gas and its concentration required for performance testing, filling the measuring gas chamber of the infrared spectral video measurement and control platform with the gas includes: if the required gas is the gas to be tested, adjusting the first flow controller and the second flow controller in the infrared spectral video measurement and control platform to obtain the gas to be tested at the required concentration in the gas mixer, and then introducing the gas in the gas mixer into the measuring gas chamber; and if the required gas is a zero-point gas, adjusting the second flow controller in the infrared spectral video measurement and control platform to obtain the zero-point gas, and then introducing the zero-point gas into the measuring gas chamber.

[0119] Furthermore, the zero-point calculation includes: filling the measurement gas chamber of the infrared spectral video measurement and control platform with the zero-point gas, simultaneously adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure to simulate atmospheric pressure; adjusting the surface radiation source temperature to a preset first surface radiation source temperature; and acquiring a first response value based on a preset first acquisition number and taking the average value to obtain the zero point of the device. The preset first acquisition number can be three times, the preset first gas temperature can be 0℃, the preset first gas pressure can be 101.3kPa±1kPa to simulate atmospheric pressure, and the preset first surface radiation source temperature can be 5℃±0.1℃, or can be adjusted according to the actual situation of the infrared spectral video device to be detected.

[0120] Furthermore, the range test includes: adjusting the surface radiation source temperature to a preset first surface radiation source temperature; filling the gas to be tested into the measurement gas chamber of the infrared spectral video measurement and control platform, adjusting the gas temperature to a preset first gas temperature and continuously increasing the concentration of the gas to be tested in the measurement gas chamber until the response value of the infrared spectral video device no longer changes; acquiring the first response value as the full-scale response value; calculating the full-scale standard volume of the gas cloud of the gas to be tested in the measurement gas chamber; and obtaining the result of the range test based on the full-scale response value and the full-scale standard volume of the gas cloud, i.e., the correspondence between the full-scale response value and the full-scale standard volume of the gas cloud. The formula for calculating the full-scale standard volume of the gas cloud is:

[0121]

[0122] in, The full-scale standard volume of the cloud is (scm). To measure the length (m) of the air chamber. The horizontal field of view (°) of the infrared lens. The vertical field of view (°) of the infrared lens. The maximum imaging distance (m) can be found in the instruction manual of the infrared spectral video equipment. The concentration corresponding to the full-scale standard volume of the gas cloud is the concentration at which the response value of the infrared spectral video device no longer changes.

[0123] Furthermore, the indication error calculation includes: within the concentration range corresponding to the standard volume of the gas cloud from 0 to full scale, selecting no fewer than three representative concentrations of the gas to be measured at certain concentration intervals. The three selected concentrations should include low, medium, and high concentration points, for example, concentrations corresponding to 10%, 30%, and 50% of the range, to verify the error characteristics of the device at different concentrations. The following operations are performed for each selected gas to be measured:

[0124] The gas to be tested is introduced into the measuring gas chamber of the infrared spectroscopy video measurement and control platform. Simultaneously, the gas temperature is adjusted to a preset first gas temperature, and the gas pressure is maintained at the preset first gas pressure. The gas temperature and surface radiation source temperature are adjusted to two different groups: the first group has the preset first gas temperature and the preset first surface radiation source temperature; the second group has the preset second gas temperature and the preset second surface radiation source temperature. For each group, a first response value is collected based on a preset first number of acquisitions, and the average value is taken. The error value is calculated for each group. The preset second gas temperature can be selected as 5℃, and the preset second surface radiation source temperature can be selected as 30℃±0.1℃, or adjusted according to the actual situation of the infrared spectroscopy video equipment to be tested.

[0125] Finally, the error value with the largest absolute value among all calculated error values ​​is selected as the indication error. The formula for calculating the error value for each group is as follows:

[0126]

[0127]

[0128] in, The error value (scm) calculated for this group. The average value (scm) calculated for this group. To measure the standard volume (scm) of the gas to be tested in the gas chamber. The concentration (vol%) of the gas to be tested. The diameter (m) of the filter window of the infrared spectral video measurement and control platform. The distance (m) between the infrared spectral video device and the filter window.

[0129] Furthermore, the sensitivity detection includes: selecting a test gas with a preset first concentration (e.g., 1 / 8 LEL) and a preset second concentration (e.g., 1 / 4 LEL), and performing the following operations for each selected test gas: filling the test gas into the measuring gas chamber of the infrared spectral video measurement and control platform, while adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure; adjusting the surface radiation source temperature to a preset second surface radiation source temperature; acquiring a first response value based on a preset first number of acquisitions and taking the average value; and calculating the sensitivity based on the calculated average value, using the following formula:

[0130]

[0131] in, For sensitivity, This is the average value of the first response corresponding to a preset first concentration of the gas to be tested. This is the average value of the first response corresponding to a preset second concentration of the test gas. The standard volume of the gas to be measured in the time chamber is set to a preset first concentration of the gas to be measured. The standard volume of the gas to be tested in the time-measuring chamber is the preset second concentration of the gas to be tested, and the unit of the parameters in this formula is scm.

[0132] Furthermore, the detection limit detection includes: filling the measurement gas chamber of the infrared spectral video measurement and control platform with the zero-point gas, while simultaneously adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at the preset first gas pressure; adjusting the gas temperature and the surface radiation source temperature to maintain a preset temperature difference, for example, a preset temperature difference of 30°C, adjusting the gas temperature to 0°C and the surface radiation source temperature to 30°C; acquiring a first response value based on a preset second acquisition frequency and a preset second acquisition number, and calculating the system noise using the following formula:

[0133]

[0134] in, For system noise, To preset the second number of data collections, This is the first response value from a single data collection. for The average value of the first response value collected. The second collection can be performed 10 times, and the second collection frequency can be once every 6 seconds.

[0135] Calculate the detection limit based on the sensitivity and the system noise. The calculation formula is:

[0136]

[0137] in, j The preset discrimination coefficient can be selected based on the confidence interval, such as at a 95% confidence level. j =3, the confidence interval can be set according to the actual situation.

[0138] Furthermore, the repeatability test includes: based on a preset third number of acquisitions, for example, set to 6 times, repeating the operation up to 6 times: filling the measurement gas chamber of the infrared spectral video measurement and control platform with the selected preset second concentration of the gas to be tested, while adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure; adjusting the gas temperature to a preset second gas temperature and adjusting the surface radiation source temperature to a preset second surface radiation source temperature; acquiring a first response value; and removing the gas to be tested.

[0139] The relative standard deviation is calculated based on the first response value collected, using the following formula:

[0140]

[0141] in, The relative standard deviation, To preset the third collection number, For the first The first response value (scm) collected in this instance. for The average value (scm) of the first response values ​​collected. The relative standard deviation (RSD) is a core indicator of equipment repeatability, directly reflecting the measurement stability of the equipment under fixed conditions. The results determine whether the equipment meets usage requirements and provide a basis for subsequent maintenance or calibration.

[0142] Furthermore, the drift test includes: continuously running the infrared spectral video equipment for a preset time, and repeatedly performing the following operations based on a preset third acquisition frequency within the preset time: filling the measurement gas chamber of the infrared spectral video measurement and control platform with the zero-point gas, while adjusting the gas temperature to a preset first gas temperature and maintaining the gas pressure at a preset first gas pressure; adjusting the gas temperature to a preset second gas temperature and adjusting the surface radiation source temperature to a preset second surface radiation source temperature; acquiring a first response value, recorded as the zero-point response value; replacing the zero-point gas with a test gas of a preset third concentration, adjusting the gas temperature to the preset second gas temperature and adjusting the surface radiation source temperature to the preset third surface radiation source temperature, for example, 25°C; acquiring a first response value, recorded as the test response value; and removing the test gas. The third concentration can be a gas between 50% and 100% of the measurement range.

[0143] Based on the collected zero-point response values, the zero-point drift corresponding to each zero-point response value is calculated, and the largest calculated zero-point drift is selected as the zero-point drift of the device. The calculation formula for the zero-point drift corresponding to each zero-point response value is as follows:

[0144]

[0145] in, For the number of data collections, for The corresponding zero drift (SCM). The zero-point response value (scm) for a single acquisition. This is the zero-point response value (scm) collected for the first time. The full-scale standard volume of the gas cloud is (scm).

[0146] Based on the collected zero-point response value and test response value, the range drift corresponding to each test response value is calculated, and the largest calculated range drift is selected as the range drift of the device. The calculation formula for the range drift corresponding to each test response value is as follows:

[0147]

[0148] in, for The corresponding range drift (SCM). This represents the test response value (scm) for a single acquisition. This is the test response value (scm) collected for the first time.

[0149] The performance testing method proposed in this invention is compatible with the infrared spectral video measurement and control platform, and can meet the simulation test requirements in most scenarios, saving a lot of manpower, material resources and time. It also provides a basis for the subsequent calibration and maintenance of infrared spectral video equipment.

[0150] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0151] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for testing the performance of an infrared spectral video device, characterized in that, The method includes: Start the infrared spectral video measurement and control platform and infrared spectral video equipment to obtain the field of view of the infrared spectral video equipment; Select the acquisition area within the field of view of the infrared spectral video equipment; Based on the gas and its concentration required for performance testing, the gas is filled into the measurement gas chamber of the infrared spectral video measurement and control platform; The infrared spectral video measurement and control platform was adjusted to simulate the environment required for performance testing; Acquire the first response value of the infrared spectral video device in the described environment; and Based on the first response value, the performance test result of the infrared spectral video device is calculated. The performance testing includes zero-point calculation, range testing, indication error calculation, sensitivity testing, detection limit testing, repeatability testing, and / or drift testing. The first response value of the infrared spectral video device acquired in the aforementioned environment includes: Based on a preset acquisition duration and a preset first acquisition frequency, the pixel values ​​of each pixel within the acquisition area are obtained; Calculate the average value of the total number of pixels collected; and The average value of the pixel values ​​is converted into a standard volume to obtain the first response value. The standard volume is obtained by converting the gas concentration corresponding to the average value of the pixel value under different gas temperatures and surface radiation source temperatures.

2. The method according to claim 1, characterized in that, The selected acquisition area within the field of view of the infrared spectral video equipment includes: Select a preparatory region, which is the region where the filter on the radiation source side of the mid-field of view is located; Determine the center position of the prepared area; and The acquisition area is obtained based on the center position and the preset size. The acquisition area is located within the preparation area.

3. The method according to claim 1, characterized in that, The gases required for the performance test include: The gas to be tested includes the gas specified by the infrared spectroscopy video device or the gas selected according to the device type of the infrared spectroscopy video device, wherein the device type includes refrigerated and unrefrigerated devices; and Zero-point gas includes clean air or nitrogen, wherein the clean air is air that does not contain the gas to be measured.

4. The method according to claim 3, characterized in that, Based on the gas and its concentration required for performance testing, filling the measurement gas chamber of the infrared spectral video measurement and control platform with the gas includes: If the required gas is the gas to be tested, then the first flow controller and the second flow controller in the infrared spectroscopy video measurement and control platform are adjusted to obtain the required concentration of the gas to be tested in the gas mixer, and the gas in the gas mixer is then introduced into the measuring gas chamber; and If the required gas is zero-point gas, the second flow controller in the infrared spectral video measurement and control platform is adjusted to obtain the zero-point gas, and the zero-point gas is introduced into the measurement gas chamber.

5. The method according to claim 3, characterized in that, The zero-point calculation includes: The zero-point gas is filled into the measuring gas chamber of the infrared spectral video measurement and control platform, while the gas temperature is adjusted to a preset first gas temperature and the gas pressure is maintained at a preset first gas pressure. Adjust the surface radiation source temperature to the preset first surface radiation source temperature; and The zero point of the device is obtained by collecting the first response value based on a preset first collection number and taking the average value.

6. The method according to claim 3, characterized in that, The range test includes: Adjust the surface radiation source temperature to the preset first surface radiation source temperature; The gas to be tested is filled into the measuring gas chamber of the infrared spectral video measurement and control platform. The gas temperature is adjusted to a preset first gas temperature and the concentration of the gas to be tested in the measuring gas chamber is continuously increased until the response value of the infrared spectral video device no longer changes. Collect the first response value as the full-scale response value; Calculate the full-scale standard volume of the gas cloud in the measuring chamber; and Based on the full-scale response value and the full-scale standard volume of the gas cloud, the result of the range test is obtained, that is, the correspondence between the full-scale response value and the full-scale standard volume of the gas cloud. The formula for calculating the full-scale standard volume of the gas cloud is as follows: in, The full-scale standard volume of the gas cloud. To measure the length of the air chamber, This refers to the horizontal field of view of the infrared lens. This refers to the vertical field of view of the infrared lens. The furthest imaging distance, This is the concentration corresponding to the full-scale standard volume of the gas cloud.

7. The method according to claim 6, characterized in that, The calculation of the indication error includes: Within the concentration range corresponding to the standard volume of the gas cloud from 0 to full scale, select no fewer than three concentrations of the gas to be tested based on a certain concentration interval, and perform the following operations for each selected gas to be tested: The gas to be tested is filled into the measuring gas chamber of the infrared spectroscopy video measurement and control platform, while the gas temperature is adjusted to a preset first gas temperature and the gas pressure is maintained at a preset first gas pressure. The gas temperature and the surface radiation source temperature are adjusted to two different groups respectively. The gas temperature in the first group is the preset first gas temperature and the surface radiation source temperature is the preset first surface radiation source temperature. The gas temperature in the second group is the preset second gas temperature and the surface radiation source temperature is the preset second surface radiation source temperature. For each group, the first response value is collected based on a preset first collection number and the average value is taken; Calculate the error value for each group separately; and The error value with the largest absolute value among all calculated error values ​​is selected as the indication error. The formula for calculating the error value for each group is as follows: in, This is the error value calculated for this group. This is the average value calculated for this group. To measure the standard volume of the gas to be tested in the gas chamber, The concentration of the gas to be measured. The diameter of the filter window of the infrared spectral video measurement and control platform is [missing information]. The distance between the infrared spectral video device and the filter window.

8. The method according to claim 3, characterized in that, The sensitivity detection includes: selecting test gases with preset first and second concentrations respectively, and performing the following operations for each selected test gas: The gas to be tested is filled into the measuring gas chamber of the infrared spectroscopy video measurement and control platform, while the gas temperature is adjusted to a preset first gas temperature and the gas pressure is maintained at a preset first gas pressure. Adjust the surface radiation source temperature to the preset second surface radiation source temperature; The first response value is collected based on a preset first number of collection attempts, and the average value is taken; and Based on the calculated average value, the sensitivity is calculated using the following formula: in, For sensitivity, This is the average value of the first response corresponding to a preset first concentration of the gas to be tested. This is the average value of the first response corresponding to a preset second concentration of the test gas. The standard volume of the gas to be measured in the time chamber is set to a preset first concentration of the gas to be measured. The standard volume of the gas to be tested in the time-measuring chamber is set to a second preset concentration of the gas to be tested.

9. The method according to claim 8, characterized in that, The detection limit detection includes: The zero-point gas is filled into the measuring gas chamber of the infrared spectral video measurement and control platform, while the gas temperature is adjusted to a preset first gas temperature and the gas pressure is maintained at a preset first gas pressure. Adjust the gas temperature and the surface radiation source temperature to maintain a preset temperature difference between them; The first response value is acquired based on a preset second acquisition frequency and a preset second acquisition number, and the system noise is calculated using the following formula: in, For system noise, To preset the second number of data collections, This is the first response value from a single data collection. for The average value of the first response value collected in each iteration; and Calculate the detection limit based on the sensitivity and the system noise. The calculation formula is: in, j The preset discrimination coefficients.

10. The method according to claim 3, characterized in that, The repeatability test includes: Repeat the following operations based on the preset third data collection count: The selected second concentration of the gas to be tested is filled into the measuring gas chamber of the infrared spectroscopy video measurement and control platform, while the gas temperature is adjusted to the first preset gas temperature and the gas pressure is maintained at the first preset gas pressure. Adjust the gas temperature to the preset second gas temperature and adjust the surface radiation source temperature to the preset second surface radiation source temperature; Collect the first response value; Remove the gas to be tested; and The relative standard deviation is calculated based on the first response value collected, using the following formula: in, The relative standard deviation, To preset the third collection number, For the first The first response value collected. for The average of the first response values ​​collected each time.

11. The method according to claim 3, characterized in that, The drift test includes: The infrared spectral video device is operated continuously for a preset time, and during the preset time, the following operations are repeatedly performed based on a preset third acquisition frequency: The zero-point gas is filled into the measuring gas chamber of the infrared spectral video measurement and control platform, while the gas temperature is adjusted to a preset first gas temperature and the gas pressure is maintained at a preset first gas pressure. Adjust the gas temperature to the preset second gas temperature and adjust the surface radiation source temperature to the preset second surface radiation source temperature; Collect the first response value and record it as the zero-point response value; Replace the zero-point gas with a pre-set third concentration of the test gas. Adjust the gas temperature to the preset second gas temperature and adjust the surface radiation source temperature to the preset third surface radiation source temperature; Collect the first response value and record it as the test response value; Remove the gas to be tested; Based on the collected zero-point response values, the zero-point drift corresponding to each zero-point response value is calculated, and the largest calculated zero-point drift is selected as the zero-point drift of the device. The calculation formula for the zero-point drift corresponding to each zero-point response value is as follows: in, For the number of data collections, for The corresponding zero-point drift, This is the zero-point response value from a single data acquisition. This is the zero-point response value collected during the first sampling. The full-scale standard volume of the gas cloud; and Based on the collected zero-point response value and test response value, the range drift corresponding to each test response value is calculated, and the largest calculated range drift is selected as the range drift of the device. The calculation formula for the range drift corresponding to each test response value is as follows: in, for The corresponding range drift, This is the test response value collected in a single instance. This is the test response value collected for the first time.

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