Gasochromic Test Device and In-situ Test System

Abstract

The present invention discloses a gasochromic testing device and an in-situ testing system. The gasochromic testing device includes a housing, a testing mechanism, and an observation mechanism. The housing has an accommodation chamber for accommodating a sample, and the housing is provided with an air inlet and an air outlet that are respectively communicated with the accommodation chamber. The air inlet is used to communicate with an external gas distribution device, and the air outlet is used to discharge the gas in the accommodation chamber. The testing mechanism is configured to be able to perform at least one of optical testing and whiteness testing on the sample in the accommodation chamber. The observation mechanism is configured to be able to observe the color change of the sample. The gasochromic testing device of the present invention can achieve color change in the temperature range of -40 to 95 °C, thereby essentially improving the use safety, and improving the test coverage, and the maintenance is relatively simple.

Description

Technical Field

[0001] The present invention relates to the field of nano-functional materials and the field of test systems, and particularly relates to a gasochromic test device and an in-situ test system. Background Art

[0002] Currently, traditional gas sensors still face some problems in aspects such as the development of core sensing materials, the formation of key sensing structures, and the testing of general sensing performance. For example, Patent CN106248596B discloses an in-situ spectral ventilation test device for a hydrogenochromic functional thin film. Aiming at the color change of the thin film-type hydrogenochromic material when exposed to hydrogen, a test device combined with a spectrophotometer is proposed. Existing test devices similar to the above patent have the following problems: the types of gases that can be adapted are few, the testing means are single, heating is required during use, and the universality is poor. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problems existing in the prior art, and provide a gasochromic test device and an in-situ test system. The gasochromic test device can achieve color change in the temperature range of -40 to 95 °C, thereby essentially improving the use safety, and improving the test coverage, and the maintenance is relatively simple.

[0004] To achieve the above purpose, on the one hand, the present invention provides a gasochromic test device, which includes a housing, a test mechanism, and an observation mechanism; the housing has a receiving chamber for accommodating a sample, the housing is provided with an air inlet and an air outlet respectively communicating with the receiving chamber, the air inlet is used to communicate with an external gas distribution device, and the air outlet is used to discharge the gas in the receiving chamber; the test mechanism is configured to be able to perform at least one of optical testing and whiteness testing on the sample in the receiving chamber; the observation mechanism is configured to be able to observe the color change of the sample.

[0005] Optionally, the test mechanism includes an optical test interface and a whiteness test interface. The optical test interface is configured to be able to connect with an external optical signal receiver, and the whiteness test interface is configured to be able to connect with an external whiteness meter.

[0006] Optionally, the optical test interface includes optical signal transmitters and receivers such as reflectance, transmittance, fluorescence, Raman, etc.

[0007] Optionally, the observation mechanism includes a photographing interface, and the photographing interface is configured to be able to connect with an external high-speed camera.

[0008] Optionally, the observation mechanism includes an observation window provided on the housing and communicating with the receiving chamber, and a transparent member is covered on the observation window.

[0009] Optionally, the transparent member is quartz glass, or at least one of polyethylene, polypropylene, acrylic material, etc., and its light transmittance > 90%.

[0010] Optionally, the housing includes a base and a top cover, the base and the top cover are detachably connected and define the accommodation chamber, and the observation window is provided on the top cover.

[0011] Optionally, the gasochromic test device includes a sample stage for placing a sample, and the sample stage is arranged in the accommodation chamber.

[0012] Optionally, the top of the sample stage has a groove, and the depth of the groove is configured to be adjustable between 0 and 2 cm.

[0013] Optionally, the sample stage includes a gasket that matches the cross-sectional shape of the groove.

[0014] Optionally, the thickness of the gasket is 0.2 to 1 cm, and the number of gaskets is multiple.

[0015] Optionally, the gasochromic test device includes a temperature adjustment mechanism, and the temperature adjustment mechanism is configured to be able to adjust the temperature in the accommodation chamber, and the adjustable temperature range is -40 to 95 °C.

[0016] Optionally, the temperature adjustment mechanism includes a temperature control pipeline capable of introducing a fluid, and the temperature control pipeline is coiled and arranged in the accommodation chamber and both ends extend out of the accommodation chamber.

[0017] Optionally, the temperature adjustment mechanism includes a heating wire and a cooling pipe, the heating wire is arranged inside the accommodation chamber, and the cooling pipe is arranged at the bottom of the housing.

[0018] Through the above technical solution, when performing a test, a test gas is introduced into the accommodation chamber through the air inlet, and after the test gas reacts with the sample in the accommodation chamber, the color of the sample changes. At this time, the data before and after the color change of the sample can be analyzed and observed simultaneously through the test mechanism and the observation mechanism, and the coverage of the test is relatively wide, solving the problem of single test means existing in the prior art.

[0019] The second aspect of the present invention provides an in-situ test system, the in-situ test system includes a gas distribution device and the above gasochromic test device, the gas distribution device is communicated with the air inlet of the gasochromic test device, and the gas distribution device has a first gas supply port, and the first gas supply port is configured to be able to supply at least one of air, hydrogen, nitric oxide, hydrogen sulfide, ammonia, ethanol, carbon monoxide, etc. to the gasochromic test device.

[0020] Optionally, the gas distribution device has a second gas supply port configured to supply at least one of nitrogen, argon, and helium to the accommodation chamber of the gasochromic test device.

[0021] Optionally, the in-situ test system includes a multi-way valve, and the first gas supply port and the second gas supply port are respectively connected to the gas inlet of the gasochromic test device through the multi-way valve.

[0022] Optionally, the in-situ test system includes a gas mass flow control unit configured to monitor and adjust the gas type, flow rate, and mixing ratio of the gas flowing through the multi-way valve.

[0023] Optionally, the in-situ test system includes an exhaust gas treatment device connected to the gas outlet of the gasochromic test device.

[0024] Optionally, a first one-way valve is provided in the gas pipeline between the gas distribution device and the gasochromic test device, and the first one-way valve is configured to allow gas to flow from the gas distribution device to the gasochromic test device while preventing gas from flowing from the gasochromic test device to the gas distribution device; a second one-way valve is provided in the gas pipeline between the gasochromic test device and the exhaust gas treatment device, and the second one-way valve is configured to allow gas to flow from the gasochromic test device to the exhaust gas treatment device while preventing gas from flowing from the exhaust gas treatment device to the gasochromic test device.

[0025] Optionally, the multi-way valve is connected to the exhaust gas treatment device so that the first gas supply port and the second gas supply port can directly supply gas to the exhaust gas treatment device.

[0026] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0027] Figure 1 is a front view of an embodiment of the gasochromic test device of the present invention;

[0028] Figure 2 is a top view of the base of the gasochromic test device of the present invention;

[0029] Figure 3 is a top view of the top cover of the gasochromic test device of the present invention;

[0030] Figure 4 is a control flowchart of an embodiment of the in-situ test system of the present invention.

[0031] Description of the Reference Numerals

[0032] 100 - housing, 110 - accommodation chamber, 120 - air inlet, 130 - air outlet, 140 - top cover, 150 - base, 141 - observation window

[0033] 200 - sample stage

[0034] 300 - temperature control pipeline Detailed implementation manners

[0035] The following will describe in detail the specific implementation manners of the present invention in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0036] As Figures 1 to 3 shown, the gasochromic test device of the present invention includes a housing 100, a test mechanism and an observation mechanism; the housing 100 has an accommodation chamber 110 for accommodating a sample, and the housing 100 is provided with an air inlet 120 and an air outlet 130 that are respectively communicated with the accommodation chamber 110. The air inlet 120 is used to communicate with an external gas distribution device, and the air outlet 130 is used to discharge the gas in the accommodation chamber 110; the test mechanism is configured to be able to perform at least one of optical testing and whiteness testing on the sample in the accommodation chamber 110; the observation mechanism is configured to be able to observe the color change of the sample.

[0037] In the present invention, when testing, a test gas is introduced into the accommodation chamber 110 through the air inlet 120. After the test gas reacts with the sample in the accommodation chamber 110, the color of the sample changes. At this time, the test mechanism and the observation mechanism can be used to analyze and observe the data of the sample before and after color change at the same time. The coverage of the test is relatively wide, and the problem of single test means existing in the prior art is solved.

[0038] Specifically, in one implementation manner of the present invention, the test mechanism includes an optical test interface and a whiteness test interface. The optical test interface is configured to be able to connect to an external optical signal receiver, and the whiteness test interface is configured to be able to connect to an external whiteness meter.

[0039] By using the whiteness test interface, quantitative analysis and data collection of the whiteness (color) of the sample before and after color change and during the color change process can be performed; by using the optical test interface, quantitative analysis and data collection of the optical information of the sample before and after color change and during the color change process can be performed.

[0040] The optical test interface includes optical signal transmitters and receivers such as reflectance, transmittance, fluorescence, Raman, etc.

[0041] Further, in an embodiment of the present invention, the observation mechanism includes a photographing interface configured to be connectable to an external high-speed camera. By using the photographing interface, intuitive, efficient, and clear data acquisition can be performed on the sample before and after color change and during the color change process.

[0042] In order to be able to observe the color change of the sample in real time, in an embodiment of the present invention, the observation mechanism includes an observation window 141 provided on the housing 100 and communicating with the accommodation chamber 110, and a transparent member is covered on the observation window 141.

[0043] Specifically, the transparent member is quartz glass with high transparency, or at least one of polyethylene, polypropylene, acrylic material, etc., and its light transmittance > 90%.

[0044] It should be understood that the housing 100 can be designed in various forms as long as it has an accommodation chamber 110 inside. In an embodiment of the present invention, the housing 100 may include a base 150 and a top cover 140, the base 150 and the top cover 140 are detachably connected and define the accommodation chamber 110, and the observation window 141 is provided on the top cover 140.

[0045] In order to be able to place the sample more conveniently, effectively, and stably, in an embodiment of the present invention, the gasochromic test device includes a sample stage 200 for placing the sample, and the sample stage 200 is arranged in the accommodation chamber 110.

[0046] In some cases, the sample may be in powder form, and in other cases, the sample may be in film form. In order to enable the sample stage 200 to well adapt to the shape of the sample, in an embodiment of the present invention, the top of the sample stage 200 has a groove, and the depth of the groove is configured to be adjustable between 0 and 2 cm.

[0047] It should be understood that the sample stage 200 can achieve the adjustable depth of the groove in various forms. For example, the sample stage 200 can control the lifting of the bottom of the groove through a lifting mechanism, thereby achieving the adjustable depth of the groove. In an embodiment of the present invention, in order to simplify the structure of the device, the sample stage 200 may include a gasket matching the cross-sectional shape of the groove. When the sample is in powder form and needs to be placed in the groove, a gasket with a smaller thickness is placed to make the depth of the groove greater than 0, so as to stably place the powdered sample. When the sample is in film form, a gasket with a larger thickness is placed to make the depth of the groove equal to 0, that is, the upper surface of the gasket is flush with the notch of the groove, so as to stably adhere the film-like sample to the gasket.

[0048] Specifically, the thickness of the gasket is 0.2 - 1 cm, and the number of gaskets is multiple.

[0049] Further, the gasochromic test device further includes a temperature adjustment mechanism configured to adjust the temperature in the accommodation chamber 110, and the adjustable temperature range is -40 to 95 °C.

[0050] It should be understood that the temperature adjustment mechanism can take various forms as long as it can adjust the temperature in the accommodation chamber 110. For example, in an embodiment of the present invention, the temperature adjustment mechanism includes a temperature control pipeline 300 through which a fluid can pass. The temperature control pipeline 300 is wound around in the accommodation chamber 110 and both ends extend out of the accommodation chamber 110. The temperature in the accommodation chamber 110 can be adjusted by adjusting the temperature of the fluid passing through the temperature control pipeline 300.

[0051] In another embodiment of the present invention, the temperature adjustment mechanism may include a heating wire and a cooling pipe. The heating wire is arranged inside the accommodation chamber 110, and the cooling pipe is arranged at the bottom of the housing 100.

[0052] The present invention also provides an in-situ test system, which includes a gas distribution device and the above-mentioned gasochromic test device. The gas distribution device is connected to the air inlet 120 of the gasochromic test device, and the gas distribution device has a first gas supply port configured to supply at least one of air, hydrogen, nitric oxide, hydrogen sulfide, ammonia, ethanol, carbon monoxide, etc. to the gasochromic test device.

[0053] Further, in an embodiment of the present invention, the gas distribution device further has a second gas supply port configured to supply at least one of nitrogen, argon, and helium to the accommodation chamber 110 of the gasochromic test device.

[0054] Air, hydrogen, nitric oxide, hydrogen sulfide, ammonia, ethanol, carbon monoxide, etc. can react with the sample, while inert gases such as nitrogen, argon, and helium can perform functions such as purging and displacing the entire system pipeline.

[0055] Sometimes it is necessary to mix the gas that reacts with the sample with the inert gas first, and then the mixed gas enters the accommodation chamber 110 to react with the sample. Therefore, in an embodiment of the present invention, the in-situ test system includes a multi-way valve. The first gas supply port and the second gas supply port are respectively connected to the air inlet 120 of the gasochromic test device through the multi-way valve. By controlling the multi-way valve, the gas that reacts with the sample and the inert gas can enter the accommodation chamber 110 separately, or the gas that reacts with the sample can be mixed with the inert gas.

[0056] In order to better control the components of the mixed gas, in one embodiment of the present invention, the in-situ test system further includes a gas mass flow control unit, which is configured to be able to monitor and adjust the gas type, flow rate, and mixing ratio of the gas flowing through the multi-way valve.

[0057] Furthermore, the in-situ test system further includes an exhaust gas treatment device connected to the gas outlet 130 of the gasochromic test device. The exhaust gas treatment device can perform harmless treatment on the exhaust gas through physical, chemical and other treatment means. The physical treatment methods adopted include but are not limited to activated carbon adsorption, molecular sieve adsorption, water washing and dissolution, etc.; the chemical treatment methods adopted include but are not limited to washing with alkaline solvents, washing with acidic solvents, photo-removal, catalytic removal, etc.

[0058] In order to prevent gas backflow from damaging the device, in one embodiment of the present invention, a first one-way valve is provided in the gas pipeline between the gas distribution device and the gasochromic test device. The first one-way valve is configured to allow gas to flow from the gas distribution device to the gasochromic test device while preventing gas from flowing from the gasochromic test device to the gas distribution device; a second one-way valve is provided in the gas pipeline between the gasochromic test device and the exhaust gas treatment device. The second one-way valve is configured to allow gas to flow from the gasochromic test device to the exhaust gas treatment device while preventing gas from flowing from the exhaust gas treatment to the gasochromic test device.

[0059] Sometimes, when the components and ratio of the mixed gas fail to meet the expectations, it cannot directly enter the accommodation chamber 110 to react with the sample. Therefore, in one embodiment of the present invention, the multi-way valve is connected to the exhaust gas treatment device so that the first gas supply port and the second gas supply port can directly supply gas to the exhaust gas treatment device. This enables the multi-way valve to directly supply the mixed gas to the exhaust gas treatment device for treatment when the components and ratio of the mixed gas fail to meet the expectations.

[0060] In order to improve the automation degree of the in-situ test system of the present invention, in one embodiment of the present invention, as Figure 4 shown, the in-situ test system further includes a PLC control device for controlling the gas distribution device, the gasochromic test device, and the exhaust gas treatment device. The control process of this PLC control device is the same as the working process of the above-mentioned in-situ test system, and will not be described in detail here.

[0061] The in-situ test system of the present invention will be described in detail below with reference to specific embodiments.

[0062] Example 1:

[0063] Select molybdenum oxide-based powder that has a significant color change in the presence of hydrogen. The gas distribution device has two gas lines, namely high-purity hydrogen and high-purity nitrogen. Each gas line is equipped with a gas mass flow control unit and a one-way valve. Different ratios of hydrogen-nitrogen mixed gas are configured as required and enter the subsequent device. The gasochromic test device is equipped with a stainless-steel sample stage. The groove size of the sample stage is adjusted to 0.5 cm to facilitate the placement of molybdenum oxide powder. At the same time, along the X-axis direction (horizontal direction) is the flow direction of the gas in and out of the gasochromic test device; in the Z-axis direction perpendicular to the X-axis, there is a large-sized visual observation window, through which the molybdenum oxide powder before and after color change can be observed in real time. Along the Y-axis direction (horizontal direction, perpendicular to the X-axis direction), there are three interfaces, namely the whiteness test interface, the optical test interface, and the photographing interface, which can perform in-situ analysis, testing, and data acquisition on the whiteness, optical information, and photos of the molybdenum oxide powder before and after color change and during the color change process. Since hydrogen has less harm to the human body and the environment, no tail gas treatment device is set in this embodiment, and the hydrogen after testing is directly discharged to the outside through the pipeline. After the test is completed, the hydrogen intake is closed, and high-purity nitrogen is continuously introduced to purge the pipelines and the sample stage of the entire in-situ test system for subsequent testing.

[0064] Example Two:

[0065] Select tungsten oxide-based thin film that has a significant color change in the presence of hydrogen sulfide. The gas distribution device has three gas lines, namely hydrogen sulfide gas, high-purity nitrogen, and compressed air. Each gas line is equipped with a gas mass flow control unit and a one-way valve. Different ratios of hydrogen-nitrogen mixed gas are configured as required and enter the subsequent device. The gasochromic test device is provided with a stainless-steel sample stage. The groove size of the sample stage is adjusted to 0, and the tungsten oxide-based thin film can be directly adhered to the sample stage for testing. At the same time, along the X-axis direction is the flow direction of the gas in and out of the gasochromic test device; in the Z-axis direction perpendicular to the X-axis, there is a large-sized visual observation window, through which the tungsten oxide thin film before and after color change can be observed in real time. Along the Y-axis direction, there are two interfaces, namely the whiteness test interface and the optical test interface, and on the X-axis of the gas intake, there is a photographing interface. The above three interfaces can perform in-situ analysis, testing, and data acquisition on the whiteness, optical information, and photos of the tungsten oxide thin film before and after color change and during the color change process. Since hydrogen sulfide has great harm to the human body and the environment, a tail gas treatment device is set in this embodiment. Using a chemical treatment method, mainly through two sections of high-concentration sodium hydroxide solution to treat the tail gas containing hydrogen sulfide, and ensuring that the hydrogen sulfide is completely absorbed before discharging the tail gas. After the test is completed, the hydrogen sulfide intake is closed, and high-purity nitrogen or compressed air is continuously introduced to purge the pipelines and the sample stage of the entire in-situ test system for subsequent testing.

[0066] Example Three:

[0067] Select tungsten oxide-based powder that has a significant color change in low-temperature hydrogen. The gas distribution device has two gas paths, namely high-purity hydrogen and high-purity nitrogen. Each gas path is equipped with a gas mass flow control unit and a one-way valve. Different proportions of hydrogen-nitrogen mixed gas are configured according to requirements and enter the subsequent device. Inside the gasochromic test device, there is a stainless-steel sample stage, and the groove size of the sample stage is adjusted to 0.7 cm to facilitate the placement of tungsten oxide powder. During the test, to meet the low-temperature test requirements (down to -40 °C), liquid nitrogen is pumped into the sample stage through a liquid nitrogen pump to achieve low-temperature measurement. At the same time, along the X-axis direction is the flow direction of the gas entering and leaving the gasochromic test device; in the Y-axis direction perpendicular to the X-axis, there is a large-sized visual observation window, through which the tungsten oxide powder before and after color change can be observed in real time. Along the Z-axis direction, there are three interfaces, namely the whiteness test interface, the optical test interface, and the photographing interface, which can perform in-situ analysis, testing, and data acquisition on the whiteness, optical information, and photos of the tungsten oxide powder before and after color change and during the color change process. Since hydrogen has less harm to the human body and the environment, no tail gas treatment device is set in this embodiment, and the hydrogen after the test is directly discharged to the outside through a pipeline. After the test, the hydrogen intake is closed, and high-purity nitrogen is continuously introduced to purge the pipelines and the sample stage of the entire in-situ test system for subsequent tests.

[0068] Example 4:

[0069] Select magnesium oxide-based thin film that has a significant color change in nitrogen monoxide. The gas distribution device has three gas paths, namely nitrogen monoxide gas, high-purity nitrogen, and compressed air. Each gas path is equipped with a gas mass flow control unit and a one-way valve. Inside the gasochromic test device, there is a stainless-steel sample stage, and the groove size of the sample stage is adjusted to 0 cm to facilitate the fixation of the magnesium oxide-based thin film. At the same time, along the X-axis direction is the flow direction of the gas entering and leaving the gasochromic test device; in the Y-axis direction perpendicular to the X-axis, there is a large-sized visual observation window, through which the magnesium oxide-based thin film before and after color change can be observed in real time. Along the Z-axis direction, there are two interfaces, namely the transmittance test interface and the photographing interface, and in the X-axis direction, there is a whiteness test interface, which can perform in-situ analysis, testing, and data acquisition on the whiteness, optical information, and photos of the molybdenum oxide powder before and after color change and during the color change process. Since nitrogen monoxide has great harm to the human body and the environment, a tail gas treatment device is set in this embodiment. The nitrogen monoxide is treated by a chemical + physical method. Potassium permanganate solution is used to oxidize nitrogen monoxide, and then the tail gas is subjected to alkali washing and water washing to avoid abnormal emission of nitrogen monoxide.

[0070] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not separately describe various possible combinations. However, these simple modifications and combinations should also be regarded as the content disclosed by the present invention and all fall within the protection scope of the present invention.

Claims

1. An air-induced color change test device, characterized in that, The gasochromic test device includes a housing (100), a sample stage (200), a test mechanism, and an observation mechanism; The housing (100) has a receiving chamber (110) for receiving samples. The housing (100) is provided with an air inlet (120) and an air outlet (130) that are respectively communicated with the receiving chamber (110). The air inlet (120) is used to communicate with an external gas distribution device, and the air outlet (130) is used to discharge the gas in the receiving chamber (110); The sample stage (200) is disposed in the receiving chamber (110), and the top of the sample stage (200) has a groove, and the depth of the groove is configured to be adjustable between 0 and 2 cm; The test mechanism includes an optical test interface and a whiteness test interface disposed on the housing (100). The optical test interface is configured to be connectable to an external optical signal receiver, and the whiteness test interface is configured to be connectable to an external whiteness meter. The test mechanism is configured to be able to perform at least one of an optical test and a whiteness test on the sample in the receiving chamber (110); The observation mechanism includes an observation window (141) disposed on the housing (100) and communicated with the receiving chamber (110). A transparent member covers the observation window (141). The observation mechanism includes a photographing interface, and the photographing interface is configured to be connectable to an external high-speed camera. The observation mechanism is configured to be able to observe the color change of the sample; Wherein, the air inlet (120) and the air outlet (130) are disposed on both sides of the housing (100) along the X-axis direction, and the observation window (141) is disposed in a direction perpendicular to the X-axis.

2. The gasochromic test device according to claim 1, characterized in that, The transparent member is at least one of quartz glass, polyethylene, polypropylene, acrylic material, etc., and its light transmittance > 90%.

3. The gasochromic test device according to claim 1, characterized in that, The housing (100) includes a base (150) and a top cover (140). The base (150) and the top cover (140) are detachably connected and define the receiving chamber (110). The observation window (141) is disposed on the top cover (140).

4. The gasochromic test device according to claim 1, characterized in that, The sample stage (200) includes a gasket that matches the cross-sectional shape of the groove.

5. The air-induced color change test device according to claim 4, characterized in that The thickness of the gasket is 0.2 - 1 cm, and the number of the gaskets is multiple.

6. The gasochromic test device according to claim 1, wherein The gasochromic test device includes a temperature adjustment mechanism, and the temperature adjustment mechanism is configured to be able to adjust the temperature in the receiving chamber (110), and the adjustable temperature range is -40 to 95 °C.

7. The gasochromic test device according to claim 6, wherein The temperature adjustment mechanism includes a temperature control pipeline (300) through which a fluid can pass. The temperature control pipeline (300) is wound around and disposed in the receiving chamber (110) and both ends extend out of the receiving chamber (110).

8. The gasochromic test device according to claim 6, wherein, The temperature adjustment mechanism includes a heating wire and a cooling pipe. The heating wire is disposed inside the receiving chamber (110), and the cooling pipe is disposed at the bottom of the housing (100).

9. An in-situ testing system, characterized in that, The in-situ testing system includes a gas distribution device and the gasochromic testing device according to any one of claims 1-8. The gas distribution device is in communication with the air inlet (120) of the gasochromic testing device. The gas distribution device has a first gas supply port configured to supply at least one of air, hydrogen, nitric oxide, hydrogen sulfide, ammonia, ethanol, carbon monoxide, etc. to the gasochromic testing device.

10. The in-situ testing system according to claim 9, characterized in that, The gas distribution device has a second gas supply port configured to supply at least one of nitrogen, argon, and helium to the accommodation chamber (110) of the gasochromic testing device.

11. The in-situ testing system according to claim 10, characterized in that, The in-situ testing system includes a multi-way valve. The first gas supply port and the second gas supply port are respectively in communication with the air inlet (120) of the gasochromic testing device through the multi-way valve.

12. The in-situ testing system according to claim 11, wherein The in-situ testing system includes a gas mass flow control unit configured to monitor and adjust the gas type, flow rate, and mixing ratio of the gas flowing through the multi-way valve.

13. The in-situ testing system according to claim 11, characterized in that, The in-situ testing system includes an exhaust gas treatment device in communication with the air outlet (130) of the gasochromic testing device.

14. The in-situ testing system according to claim 13, characterized in that, A first one-way valve is provided in the gas pipeline between the gas distribution device and the gasochromic testing device. The first one-way valve is configured to allow gas to flow from the gas distribution device to the gasochromic testing device while preventing gas from flowing from the gasochromic testing device to the gas distribution device. A second one-way valve is provided in the gas pipeline between the gasochromic testing device and the exhaust gas treatment device. The second one-way valve is configured to allow gas to flow from the gasochromic testing device to the exhaust gas treatment device while preventing gas from flowing from the exhaust gas treatment device to the gasochromic testing device.

15. The in-situ testing system according to claim 13, characterized in that, The multi-way valve is in communication with the exhaust gas treatment device so that the first gas supply port and the second gas supply port can directly supply gas to the exhaust gas treatment device.

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