Closed gas controlled release test platform for testing infrared imaging equipment

Abstract

The invention discloses a closed gas controlled release test platform for testing infrared imaging equipment. The closed gas controlled release test platform comprises a gas source, a gas release box, a control system and an auxiliary system, the gas source is connected with the gas release box through a pipeline; the control system is respectively connected with the gas source, the gas release box and the auxiliary system; the auxiliary system is respectively connected with the gas source and the gas release box through pipelines; the gas release box comprises a gas chamber and a black body source; the air chamber and the black body source are arranged adjacently; the air chamber is in a cuboid shape. The invention provides a large-size closed gas controlled release test platform, which can be used for simulating hazardous gas leakage diffusion distribution in a real environment in a laboratory environment, obtaining the gas column concentration with the highest optical path of 1000mm, and flexibly adjusting the gas source type according to detection requirements. Concentration inversion algorithm development and concentration calibration of the infrared imaging equipment can be realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of infrared imaging, and particularly relates to a closed gas control and release test platform for infrared imaging equipment testing. BACKGROUND

[0002] Oil and gas leakage and the accompanying uncontrollable energy release are one of the main reasons for safety production accidents in the petrochemical industry. Strengthening the construction of oil and gas leakage monitoring and early warning system is not only the safety and environmental protection responsibility of oil and gas production and processing enterprises, but also the internal need to improve their own competitiveness and realize high-quality development. With the development of optical imaging technology, in recent years, detection technologies and equipment based on the infrared characteristic absorption of oil and gas, such as thermal imaging and spectral imaging, have entered the "fast lane" of production site application due to their characteristics of rapidness, wide range, visualization and remote sensing detection. Domestic and foreign scientific research institutions and enterprises have developed oil and gas leakage infrared imaging monitoring equipment with different technical principles, system architectures, identification algorithms and control software according to the types of detected media, costs and application scenarios, forming a series of products.

[0003] In the development and testing of infrared imaging equipment, concentration inversion algorithm development and concentration calibration in the laboratory environment are essential links, and are also important guarantees for the infrared imaging equipment to meet the factory inspection requirements and ensure the accuracy and reliability of the detection results in the field application. However, oil and gas production and processing enterprises involve toxic and flammable and explosive media such as alkanes, alkenes and aromatic hydrocarbons, and cannot release such detection gases in the semi-open environment in the laboratory in the early stage; secondly, the existing closed gas control and release test devices are small-sized gas chambers of 5-10 cm, lack of meter-sized simulation leakage gas chambers, and cannot clearly present the distribution of gas clouds, which cannot meet the needs of infrared imaging equipment concentration calibration; thirdly, it is urgently needed to standardize the infrared imaging equipment concentration calibration and performance testing method in the concentration-distance two-dimensional and establish relevant standards. In view of the above problems, it is urgent to build a large-size closed gas control and release test platform. SUMMARY

[0004] In view of the above problems, the application discloses a closed gas control and release test platform for infrared imaging equipment testing, which comprises: a gas source, a gas release box, a control system and an auxiliary system.

[0005] The gas source is connected with the gas release box through a pipeline;

[0006] The control system is connected with the gas source, the gas release box and the auxiliary system respectively;

[0007] The auxiliary system is connected with the gas source and the gas release box through a pipeline respectively;

[0008] The gas release box comprises a gas chamber and a black body source;

[0009] The air chamber and the black body source are arranged adjacently.

[0010] The air chamber is a cuboid.

[0011] Further, the air source comprises an air bottle, a sulfur hexafluoride bottle, a nitrogen bottle and a methane bottle.

[0012] The air bottle, the sulfur hexafluoride bottle, the nitrogen bottle and the methane bottle are connected with the gas release box through pipelines.

[0013] The air source further comprises a compressed air bottle mass flow controller, a compressed sulfur hexafluoride bottle mass flow controller, a compressed nitrogen bottle mass flow controller and a compressed methane bottle mass flow controller.

[0014] The compressed air bottle mass flow controller is installed at the air bottle outlet.

[0015] The compressed sulfur hexafluoride bottle mass flow controller is installed at the sulfur hexafluoride bottle outlet.

[0016] The compressed nitrogen bottle mass flow controller is installed at the nitrogen bottle outlet.

[0017] The compressed methane bottle mass flow controller is installed at the methane bottle outlet.

[0018] Further, the air chamber comprises a stainless steel bottom plate, a stainless steel frame, a glass window piece, a sensor, a gas inlet, a gas outlet and a support frame.

[0019] The bottom of the stainless steel frame is provided with a stainless steel bottom plate.

[0020] The glass window piece is arranged on the stainless steel frame.

[0021] The sensor is arranged on the stainless steel bottom plate.

[0022] The gas inlet and the gas outlet are arranged on the stainless steel bottom plate.

[0023] The stainless steel bottom plate is installed on the support frame.

[0024] Further, the glass window piece is a zinc selenide glass window piece with a transmittance of not less than 70% in the 2-14 μm wave band.

[0025] Further, the glass window piece comprises a first zinc selenide glass window piece, a second zinc selenide glass window piece, a third zinc selenide glass window piece, a fourth zinc selenide glass window piece and a fifth zinc selenide glass window piece.

[0026] The first zinc selenide glass window piece is arranged on the front side of the stainless steel frame.

[0027] The second zinc selenide glass window piece is arranged on the right side of the stainless steel frame.

[0028] The third zinc selenide glass window sheet is arranged on the back side of the stainless steel frame;

[0029] The fourth zinc selenide glass window sheet is arranged on the top side of the stainless steel frame;

[0030] The fifth zinc selenide glass window sheet is arranged on the left side of the stainless steel frame.

[0031] Further, the sensors include a pressure sensor, a gas concentration sensor, a temperature sensor, and a humidity sensor;

[0032] The pressure sensor, the gas concentration sensor, the gas outlet, the gas inlet, the temperature sensor, and the humidity sensor are arranged on the line connecting the midpoints of the two short sides of the stainless steel bottom plate and are symmetrically arranged about the center point of the stainless steel bottom plate.

[0033] Further, the control system includes a control computer;

[0034] The control computer is connected to the gas source, the gas release tank, and the auxiliary system.

[0035] Further, the auxiliary system includes a gas blender, a buffer tank, and a vacuum pump;

[0036] One end of the gas blender is connected to the gas source through a pipeline, and the other end is connected to the gas release tank through a pipeline;

[0037] One end of the buffer tank is connected to the gas release tank through a pipeline, and the other end is connected to the vacuum pump through a pipeline.

[0038] Further, the buffer tank includes a buffer tank body, a pressure gauge, and a safety vent valve;

[0039] The safety vent valve is connected to the outlet at the top end of the buffer tank body;

[0040] The pressure gauge is arranged between the buffer tank body and the safety vent valve.

[0041] Further, the auxiliary system further includes a first control valve, a second control valve, a third control valve, and a fourth control valve;

[0042] The first control valve is arranged on the pipeline between the gas source and the gas blender;

[0043] The second control valve is arranged on the pipeline between the gas blender and the gas release tank;

[0044] The third control valve is arranged on the pipeline between the gas release tank and the buffer tank;

[0045] The fourth control valve is arranged on a pipeline between the buffer tank and the vacuum pump.

[0046] Compared with the prior art, the embodiment of the application has at least the following advantages: the application provides a large-size closed gas control test platform, which can simulate the leakage and diffusion distribution of hazardous gas in a real environment in a laboratory environment, obtain a gas column concentration with a maximum optical path of 1000mm, and flexibly adjust the types of gas sources according to detection requirements, so as to realize the development of concentration inversion algorithm of infrared imaging equipment and concentration calibration.

[0047] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0049] Figure 1 A schematic diagram of a closed gas control test platform for infrared imaging equipment testing according to an embodiment of the present application is shown;

[0050] Figure 2 A structural schematic diagram of a gas chamber according to an embodiment of the present application is shown;

[0051] Figure 3 A front view of a gas chamber according to an embodiment of the present application is shown;

[0052] Figure 4 A right view of a gas chamber according to an embodiment of the present application is shown;

[0053] Figure 5 A top view of a gas chamber according to an embodiment of the present application is shown.

[0054] Reference signs: 101-compressed air bottle mass flow controller, 102-compressed sulfur hexafluoride bottle mass flow controller, 103-compressed nitrogen bottle mass flow controller, 104-compressed methane bottle mass flow controller, 105-control computer, 106-first control valve, 107-gas blender, 108-second control valve, 109-gas chamber, 110-support frame, 111-blackbody source, 112-third control valve, 113-buffer tank, 114-vacuum pump, 115-pressure gauge, 116-safety vent valve, 117-fourth control valve, 201-first zinc selenide glass window sheet, 202-second zinc selenide glass window sheet, 203-third zinc selenide glass window sheet, 204-fourth zinc selenide glass window sheet, 205-fifth zinc selenide glass window sheet, 206-stainless steel bottom plate, 207-stainless steel frame, 208-pressure sensor, 209-gas concentration sensor, 210-temperature sensor, 211-humidity sensor, 212-gas inlet, 213-gas outlet. DETAILED DESCRIPTION

[0055] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0056] The purpose of the present application is to provide a large-size closed gas control release test platform for revealing the radiation brightness change and transmission law after the leakage of dangerous gas with different distances and different concentrations in a laboratory environment, and to develop the concentration inversion algorithm of infrared imaging equipment and concentration calibration test under different distances and different gas concentrations, so as to solve the problems existing in the above-mentioned small-sized gas chamber.

[0057] Figure 1 A schematic diagram of a closed gas control release test platform for infrared imaging equipment testing according to an embodiment of the present application is shown. As shown in Figure 1 The closed gas control release test platform for infrared imaging equipment testing proposed by the present application comprises a gas source, a gas release box, a control system, an auxiliary system, a pipeline and a pipe fitting;

[0058] The gas source and the gas release box are connected through the pipeline;

[0059] The control system is connected with the gas source, the gas release box and the auxiliary system respectively;

[0060] The auxiliary system is connected with the gas source and the gas release box through the pipeline respectively.

[0061] In some embodiments, the gas source is a compressed gas cylinder with purity of 99% or above, including air cylinder, sulfur hexafluoride cylinder, nitrogen cylinder and methane cylinder;

[0062] The air cylinder, sulfur hexafluoride cylinder, nitrogen cylinder and methane cylinder are connected to the gas chamber 109 of the gas release box through pipelines;

[0063] The gas source further includes a compressed air cylinder mass flow controller 101, a compressed sulfur hexafluoride cylinder mass flow controller 102, a compressed nitrogen cylinder mass flow controller 103 and a compressed methane cylinder mass flow controller 104;

[0064] The compressed air cylinder mass flow controller 101 and the pressure gauge 115 are installed at the air cylinder outlet;

[0065] The compressed sulfur hexafluoride cylinder mass flow controller 102 and the pressure gauge 115 are installed at the sulfur hexafluoride cylinder outlet;

[0066] The compressed nitrogen cylinder mass flow controller 103 and the pressure gauge 115 are installed at the nitrogen cylinder outlet;

[0067] The compressed methane cylinder mass flow controller 104 and the pressure gauge 115 are installed at the methane cylinder outlet.

[0068] The type of gas entering the gas chamber 109 can be adjusted by the control system, so that the test platform is suitable for infrared imaging equipment with different detector response wavebands.

[0069] The gas concentration in the gas chamber 109 and the direction (forward or lateral) of the infrared imaging equipment aiming at the gas chamber 109 can be adjusted by the control system, so that the test experiment of the infrared imaging equipment under different gas column concentration conditions can be realized.

[0070] The distance between the infrared imaging equipment and the gas chamber 109 can be changed, so that the test experiment of the infrared imaging equipment under different detection distances can be realized.

[0071] For different gas types or test detection requirements that cannot continuously adjust the concentration of the gas entering the gas chamber 109 by the control system, the replacement and storage of the medium in the gas chamber 109 can be realized by the control system and the auxiliary system.

[0072] The air cylinder, sulfur hexafluoride cylinder, nitrogen cylinder and methane cylinder can provide air, sulfur hexafluoride, nitrogen and methane gas according to the test requirements. The actual detection gas type requirements can be replaced and expanded, and each compressed gas cylinder of the gas source is provided with a pressure gauge 115 and a mass flow controller.

[0073] In some embodiments, the gas release box includes a large-size closed gas chamber 109 and a blackbody source 111;

[0074] The gas chamber 109 and the blackbody source 111 are arranged adjacent to each other;

[0075] The air chamber 109 is generally rectangular. For example, the dimensions of the air chamber 109 are 800mm × 800mm × 1000mm.

[0076] Gas chamber 109 is used to store a target gas of known composition and concentration for controlled release, while also having infrared transmission capability over a wide wavelength range.

[0077] Blackbody source 111 is a differential surface blackbody source used to simulate the radiance of targets at low and normal temperatures.

[0078] A differential blackbody source 111 is positioned behind the gas chamber 109, and the outlet of the differential blackbody source 111 is adjacent to the gas chamber 109. This allows the radiation emitted from the blackbody radiation source to be absorbed by the gas in the absorption chamber 109 before entering the infrared imaging device. The performance of the infrared imaging device and the gas concentration calibration are achieved by adjusting the gas concentration and type in the gas chamber 109 and the background radiation temperature.

[0079] like Figure 2 As shown, in some embodiments, the gas chamber 109 includes a stainless steel base plate 206, a stainless steel frame 207, a glass window, a sensor, a gas inlet 212, a gas outlet 213, and a support frame 110.

[0080] The stainless steel frame 207 has a stainless steel base plate 206 at its bottom, and the two are welded together to form an air chamber box.

[0081] The glass window is mounted on the stainless steel frame 207; the five infrared-transmitting glass window is bonded to the stainless steel air chamber box with inert or passivated sealing elements or gaskets to form a closed air chamber 109.

[0082] The sensor is mounted on a stainless steel base plate 206;

[0083] The gas inlet 212 and the gas outlet 213 are mounted on the stainless steel base plate 206;

[0084] The stainless steel base plate 206 is mounted on the support frame 110.

[0085] Stainless steel base plate 206, used to support and fix the enclosed gas chamber 109, sensor, gas inlet and outlet pipes and support frame 110;

[0086] Stainless steel frame 207, used to support and secure the glass window panes;

[0087] A glass window is used to form a closed air chamber 109 that is infrared-transmitting within a specific wide wavelength range;

[0088] Gas inlet 212, for connecting the gas source and the gas release box, and introducing the gas with target components and concentration into the gas chamber 109;

[0089] Gas outlet 213, for connecting the gas release box and the auxiliary system, and emptying the gas chamber 109 after the experiment;

[0090] Support frame 110, for supporting and fixing the gas release box.

[0091] The stainless steel bottom plate 206 of the gas chamber 109 is welded to the stainless steel frame 207 to form a box body, which is connected to the support frame 110 through a base, and the zinc selenide glass window sheet is bonded to the stainless steel box body through inert or passivated sealing elements or gaskets, ensuring the sealing, safety and stability of the gas chamber during the experiment.

[0092] In some embodiments, the glass window sheet is a zinc selenide glass window sheet with a transmittance of not less than 70% in the 2-14 μm waveband. Typical hazardous gases in the petroleum and petrochemical industry, such as alkanes, alkenes, ammonia, sulfur oxides, etc., have infrared absorption characteristics in the 2-14 μm waveband, and the use of zinc selenide glass window sheets can minimize the loss of light flux during the detection and calibration experiments of the above-mentioned types of gases.

[0093] In some embodiments, the glass window sheet includes a first zinc selenide glass window sheet 201, a second zinc selenide glass window sheet 202, a third zinc selenide glass window sheet 203, a fourth zinc selenide glass window sheet 204, and a fifth zinc selenide glass window sheet 205;

[0094] As shown in Figure 3 , the first zinc selenide glass window sheet 201 is arranged on the front side of the stainless steel frame 207;

[0095] As shown in Figure 4 , the second zinc selenide glass window sheet 202 is arranged on the right side of the stainless steel frame 207;

[0096] The third zinc selenide glass window sheet 203 is arranged on the back side of the stainless steel frame 207;

[0097] As shown in Figure 5 , the fourth zinc selenide glass window sheet 204 is arranged on the top side of the stainless steel frame 207;

[0098] The fifth zinc selenide glass window sheet 205 is arranged on the left side of the stainless steel frame 207.

[0099] In some embodiments, the sensor includes a pressure sensor 208, a gas concentration sensor 209, a temperature sensor 210, and a humidity sensor 211;

[0100] The pressure sensor 208, the gas concentration sensor 209, the gas outlet 213, the gas inlet 212, the temperature sensor 210 and the humidity sensor 211 are linearly arranged on the line connecting the midpoints of the two short sides of the stainless steel bottom plate 206, and the humidity sensor 211, the temperature sensor 210, the gas inlet 212 and the gas outlet 213, the gas concentration sensor 209 and the pressure sensor 208 are symmetrically arranged about the center point of the stainless steel bottom plate 206. In view of the randomness and uniformity of the diffusion and distribution of the gas after entering the gas chamber 109 or even filling the gas chamber 109, the central and symmetric arrangement of the gas inlet 212, the gas outlet 213 and the sensors can maximize the reflection of the real state of the gas in the gas chamber 109.

[0101] The pressure sensor 208 is used to monitor the pressure value in the gas chamber 109 in real time.

[0102] The gas concentration sensor 209 is used to monitor the target gas concentration value in the gas chamber 109 in real time.

[0103] The temperature sensor 210 is used to monitor the temperature value in the gas chamber 109 in real time.

[0104] The humidity sensor 211 is used to monitor the humidity value in the gas chamber 109 in real time.

[0105] The gas concentration sensor 209 is a methane gas sensor, and the gas concentration sensor 209 can be replaced according to the type of the gas to be measured.

[0106] In some embodiments, the control system includes a control computer 105.

[0107] The control computer 105 is connected with the gas source, the gas release tank and the auxiliary system.

[0108] Specifically, the control computer 105 is connected with the compressed air bottle mass flow controller 101, the compressed sulfur hexafluoride bottle mass flow controller 102, the compressed nitrogen gas bottle mass flow controller 103, the compressed methane bottle mass flow controller 104, the first control valve 106, the second control valve 108, the third control valve 112, the vacuum pump 114, the safety vent valve 116, the fourth control valve 117, the pressure sensor 208, the gas concentration sensor 209, the temperature sensor 210 and the humidity sensor 211.

[0109] The control computer 105 controls and monitors the operation parameters of the test platform, and allows the execution of the pre-written operation program and the analysis of the flow data after the test.

[0110] In some embodiments, the auxiliary system includes a gas blender 107, a buffer tank 113 and a vacuum pump 114.

[0111] The gas mixer 107 is connected with the air cylinder, the sulfur hexafluoride cylinder, the nitrogen cylinder and the methane cylinder through pipes at one end, and is connected with the gas inlet 212 of the gas chamber 109 of the gas release box through pipes at the other end;

[0112] The buffer tank 113 is connected with the gas outlet 213 of the gas chamber 109 of the gas release box through pipes at one end, and is connected with the vacuum pump 114 through pipes at the other end.

[0113] The gas mixer 107 is used for mixing different kinds and proportions of gases.

[0114] The buffer tank 113 is used for collecting and storing the exhaust gas of the test platform.

[0115] The vacuum pump 114 is used for pumping and exhausting the gas in the buffer tank 113.

[0116] In some embodiments, the buffer tank 113 comprises a buffer tank body, a pressure gauge 115 and a safety vent valve 116.

[0117] The safety vent valve 116 is connected with the top outlet of the buffer tank body.

[0118] The pressure gauge 115 is arranged between the buffer tank body and the safety vent valve 116.

[0119] The pipes and pipe fittings include connecting pipes, elbows, flanges and sealing gaskets.

[0120] In some embodiments, the auxiliary system further comprises a first control valve 106, a second control valve 108, a third control valve 112 and a fourth control valve 117.

[0121] The first control valve 106 is arranged on the pipe between the gas source and the gas mixer 107.

[0122] The second control valve 108 is arranged on the pipe between the gas mixer 107 and the gas chamber 109 of the gas release box.

[0123] The third control valve 112 is arranged on the pipe between the gas chamber 109 of the gas release box and the buffer tank 113.

[0124] The fourth control valve 117 is arranged on the pipe between the buffer tank 113 and the vacuum pump 114.

[0125] The first control valve 106 is used for opening or cutting off the connection between the gas source and the gas mixer 107.

[0126] The second control valve 108 is used for opening or cutting off the connection between the gas mixer 107 and the gas chamber 109 of the gas release box.

[0127] a third control valve 112 for opening or cutting off the connection between the gas chamber 109 of the gas release tank and the auxiliary system;

[0128] a fourth control valve 117 for opening or cutting off the connection between the buffer tank 113 and the vacuum pump 114.

[0129] The application provides a large-size closed gas control release test platform.

[0130] The test process of the application is as follows:

[0131] 1. Check the air tightness of the test platform.

[0132] Open the first control valve 106, the second control valve 108, the third control valve 112 and the fourth control valve 117, close the compressed air bottle mass flow controller 101, the compressed sulfur hexafluoride bottle mass flow controller 102, the compressed nitrogen bottle mass flow controller 103, the compressed methane bottle mass flow controller 104 and the safety vent valve 116, open the vacuum pump 114 to pump the pipeline and the gas chamber 109, and continue for 5 minutes, close the fourth control valve 117 and the vacuum pump 114, observe and record the pressure sensor 208 and the pressure gauge 115, and if the readings remain unchanged within 30 minutes, it indicates that the air tightness of the test platform is good.

[0133] 2. Blackbody radiation calibration.

[0134] 1) After the air tightness check of the test platform is completed, open the compressed air bottle mass flow controller 101, the compressed sulfur hexafluoride bottle mass flow controller 102, the compressed nitrogen bottle mass flow controller 103, the compressed methane bottle mass flow controller 104, the safety vent valve 116, the second control valve 108 and the third control valve 112, close the safety vent valve 116 and the fourth control valve 117, and fill 0.1 MPa air into the gas chamber 109 through the control system, close the second control valve 108 and the third control valve 112, place the differential planar blackbody source 111 at the back of the gas chamber 109, and align the infrared imaging device with the blackbody radiation surface so that the imaging field of view is not greater than the blackbody surface source.

[0135] 2) Turn on the infrared imaging device and preheat it for not less than 30 minutes to make the core temperature of the infrared imaging device constant.

[0136] 3) open the differential face blackbody source 111 switch, set to 10℃ (283K), after the temperature is stable, collect the blackbody radiation response of the infrared imaging device, obtain multiple frames of multi-bit raw data;

[0137] 4) set the differential face blackbody source 111 to 15℃, 20℃, 30℃, …, 80℃ in turn, repeat step 3;

[0138] 5) take the mean value of the 10℃-80℃ raw data of the infrared imaging device respectively;

[0139] 6) fit a straight line to the 10℃-80℃ blackbody radiation response mean value calculated by the infrared imaging device, and select the appropriate high temperature t H and low temperature t L point collected by the detector to the blackbody radiation response;

[0140] 7) according to the two-point correction principle, the correction parameters gain matrix and bias matrix of the infrared imaging device are calculated, that is, the two-point correction is completed.

[0141] 3. Concentration information calibration.

[0142] 1) Take CH4 gas as an example. Turn on the infrared imaging device and preheat for not less than 30 minutes to make the core temperature of the infrared imaging device constant;

[0143] 2) After the test platform airtightness check is completed, open the compressed air bottle mass flow controller 101, the compressed sulfur hexafluoride bottle mass flow controller 102, the compressed nitrogen bottle mass flow controller 103, the compressed methane bottle mass flow controller 104, the first control valve 106, the second control valve 108, and the third control valve 112, close the safety vent valve 116 and the fourth control valve 117, fill 0.1MPa pure CH4 gas (more than 99%) into the gas chamber 109 through the control system, close the second control valve 108 and the third control valve 112, place the differential face blackbody source 111 behind the gas chamber 109, and align the infrared imaging device with the blackbody radiation surface so that the imaging field of view is not greater than the blackbody surface source;

[0144] 3) open the differential face blackbody source 111 switch and set the temperature to room temperature 25℃;

[0145] 4) collect multiple frames of multi-bit raw data of the infrared imaging device;

[0146] 5) change the CH4 gas concentration of the gas chamber 109, and repeat steps 2) to 4).

[0147] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood that modifications can be made to the foregoing embodiments, or additional implementations can be implemented, without departing from the spirit and scope of the inventive subject matter. Accordingly, the present application is not limited to the implementations described herein, but is intended to be defined by the claims set forth below, and equivalents thereof.

Claims

1. A closed gas controlled-release test platform for testing infrared imaging equipment, characterized in that, include: Gas source, gas release box, control system and auxiliary system; The gas source and the gas release box are connected by a pipeline; The control system is connected to the gas source, the gas release box, and the auxiliary system, respectively. The auxiliary system is connected to the gas source and the gas release box via pipelines; The gas release box includes a gas chamber (109) and a blackbody source (111); The gas chamber (109) and the blackbody source (111) are arranged adjacent to each other; The air chamber (109) is rectangular.

2. The closed gas controlled-release test platform for testing infrared imaging equipment according to claim 1, characterized in that, The gas source includes air cylinders, sulfur hexafluoride cylinders, nitrogen cylinders, and methane cylinders; The air cylinder, sulfur hexafluoride cylinder, nitrogen cylinder, and methane cylinder are all connected to the gas release box via pipelines; The gas source also includes: a compressed air cylinder mass flow controller (101), a compressed sulfur hexafluoride cylinder mass flow controller (102), a compressed nitrogen cylinder mass flow controller (103), and a compressed methane cylinder mass flow controller (104); The compressed air cylinder mass flow controller (101) is installed at the air cylinder outlet; The mass flow controller (102) for the compressed sulfur hexafluoride cylinder is installed at the outlet of the sulfur hexafluoride cylinder; The mass flow controller (103) for the compressed nitrogen cylinder is installed at the outlet of the nitrogen cylinder; The mass flow controller (104) for the compressed methane bottle is installed at the outlet of the methane bottle.

3. The closed gas controlled-release test platform for testing infrared imaging equipment according to claim 1, characterized in that, The gas chamber (109) includes a stainless steel base plate (206), a stainless steel frame (207), a glass window, a sensor, a gas inlet (212), a gas outlet (213), and a support frame (110); The stainless steel frame (207) is provided with a stainless steel base plate (206) at its bottom; The glass panes are mounted on a stainless steel frame (207); The sensor is mounted on a stainless steel base plate (206); The gas inlet (212) and gas outlet (213) are mounted on a stainless steel base plate (206); The stainless steel base plate (206) is mounted on the support frame (110).

4. The closed gas controlled-release test platform for testing infrared imaging equipment according to claim 3, characterized in that, The glass window is a zinc selenide glass window with a transmittance of not less than 70% in the 2-14μm band.

5. The closed gas controlled-release test platform for testing infrared imaging equipment according to claim 3 or 4, characterized in that, The glass window panes include a first zinc selenide glass window pane (201), a second zinc selenide glass window pane (202), a third zinc selenide glass window pane (203), a fourth zinc selenide glass window pane (204), and a fifth zinc selenide glass window pane (205); The first zinc selenide glass pane (201) is disposed on the front side of the stainless steel frame (207); The second zinc selenide glass pane (202) is disposed on the right side of the stainless steel frame (207); The third zinc selenide glass pane (203) is disposed on the rear side of the stainless steel frame (207); The fourth zinc selenide glass window (204) is disposed on the top surface of the stainless steel frame (207); The fifth zinc selenide glass window (205) is located on the left side of the stainless steel frame (207).

6. The closed gas controlled-release test platform for testing infrared imaging equipment according to claim 3, characterized in that, The sensors include a pressure sensor (208), a gas concentration sensor (209), a temperature sensor (210), and a humidity sensor (211); The pressure sensor (208), gas concentration sensor (209), gas outlet (213), gas inlet (212), temperature sensor (210), and humidity sensor (211) are arranged on the line connecting the midpoints of the two short sides of the stainless steel base plate (206), and are symmetrically arranged about the center point of the stainless steel base plate (206).

7. The closed gas controlled-release test platform for testing infrared imaging equipment according to claim 1, characterized in that, The control system includes a control computer (105); The control computer (105) is connected to the gas source, the gas release box and the auxiliary system respectively.

8. The closed gas controlled-release test platform for testing infrared imaging equipment according to claim 1, characterized in that, The auxiliary system includes a gas mixer (107), a buffer tank (113), and a vacuum pump (114); One end of the gas mixer (107) is connected to the gas source through a pipeline, and the other end is connected to the gas release box through a pipeline; One end of the buffer tank (113) is connected to the gas release box via a pipe, and the other end is connected to the vacuum pump (114) via a pipe.

9. The closed gas controlled-release test platform for testing infrared imaging equipment according to claim 8, characterized in that, The buffer tank (113) includes a buffer tank body, a pressure gauge (115), and a safety vent valve (116); The buffer tank is equipped with a safety vent valve (116) at the top outlet. The pressure gauge (115) is located between the buffer tank body and the safety vent valve (116).

10. The closed gas controlled-release test platform for testing infrared imaging equipment according to claim 8, characterized in that, The auxiliary system also includes: a first control valve (106), a second control valve (108), a third control valve (112), and a fourth control valve (117); The first control valve (106) is installed on the pipeline between the gas source and the gas mixer (107); The second control valve (108) is located on the pipeline between the gas mixer (107) and the gas release box; The third control valve (112) is installed on the pipeline between the gas release box and the buffer tank (113); The fourth control valve (117) is located on the pipeline between the buffer tank (113) and the vacuum pump (114).

Images