An ultraviolet light detection sensitivity testing device and method

Abstract

The present application relates to the technical field of ultraviolet light detection, and particularly relates to a device and method for testing sensitivity of ultraviolet light detection, which comprises a bearing platform, a support assembly, a double-integrating sphere light homogenizing assembly, an ultraviolet light source attenuation unit and a dark chamber on the bearing platform. The double-integrating sphere light homogenizing assembly comprises a first integrating sphere and a second integrating sphere, the top of the second integrating sphere is provided with an incident interface and is sequentially connected with a variable diaphragm, the first integrating sphere, a neutral attenuation sheet group and an ultraviolet light source unit, and the side wall light outlet of the second integrating sphere is sealingly connected with the light inlet hole of the dark chamber. A linear guide rail is arranged in the dark chamber, and an ultraviolet irradiance meter is slidingly arranged on the linear guide rail, and a measured ultraviolet camera is arranged in the dark chamber through a camera assembly. The present application realizes high stable output and wide dynamic range accurate attenuation of the ultraviolet light source, and improves the precision and reliability of the sensitivity test of the ultraviolet camera.

Description

Technical Field

[0001] This invention relates to the field of ultraviolet light detection technology, and in particular to an ultraviolet light detection sensitivity testing device and method. Background Technology

[0002] The light detection sensitivity of a solar-blind ultraviolet camera is a core parameter for evaluating its performance, directly affecting its ability to detect weak ultraviolet signals. Currently, the main methods for testing ultraviolet light detection sensitivity include the high-temperature blackbody method, the monochromator integrating sphere method, and the attenuator method. The high-temperature blackbody method suffers from low radiation energy in the deep ultraviolet band and limited temperature control precision, resulting in significant calibration uncertainty. The monochromator integrating sphere method has a complex system structure and is difficult to debug. The attenuator method requires multiple attenuators when calibrating weak irradiance, and the multiple reflections of the light signal between the attenuators significantly reduce calibration accuracy.

[0003] In existing testing technologies, ultraviolet light sources are affected by temperature drift and power supply fluctuations, resulting in poor output stability and a lack of real-time monitoring and correction methods; single integrating sphere systems have limited light uniformity, making it difficult to meet the requirements of high-precision testing; radiometers are usually fixed in non-main optical paths, and the irradiance at the camera position is obtained indirectly, resulting in a large deviation between the calibrated value and the actual value; in addition, camera position adjustment mechanisms are mostly fixed, making it difficult to calibrate the coaxiality of the optical path and the object distance.

[0004] Therefore, there is an urgent need for an ultraviolet light detection sensitivity testing device and method that can provide a highly stable ultraviolet light source, a highly uniform light-emitting surface, precise coaxial irradiance calibration, and wide dynamic range with accurate attenuation adjustment. Summary of the Invention

[0005] The purpose of this invention is to provide an ultraviolet light detection sensitivity testing device and method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides an ultraviolet light detection sensitivity testing device. The device includes a support platform and a support assembly, a dual integrating sphere homogenizing assembly, an ultraviolet light source attenuation unit, and a dark chamber disposed on the support platform. The dual integrating sphere homogenizing assembly includes a first integrating sphere and a second integrating sphere. The second integrating sphere is fixed to the support platform by the support assembly. The second integrating sphere has a light outlet opening on the side wall of the dark chamber, and the side wall of the dark chamber has a light inlet opening. The light outlet and the light inlet opening correspond to each other and are sealed together. The ultraviolet light source attenuation unit includes an ultraviolet light source unit, a neutral density filter group, and a variable aperture. The top of the second integrating sphere has an incident interface, and the variable aperture, the first integrating sphere, the neutral density filter group, and the ultraviolet light source unit are connected in sequence at the incident interface. The dark chamber is equipped with an ultraviolet radiometer, a linear guide rail, and a UV camera under test. The ultraviolet radiometer is mounted on the linear guide rail via a mounting base and moves along the linear guide rail. The UV camera under test is placed inside the dark chamber via a camera adjustment assembly. The UV camera under test is coaxially arranged with the light entrance aperture.

[0007] Preferably, the ultraviolet light source unit includes an ultraviolet light source and a heat dissipation module, wherein the heat dissipation module is attached to the outside of the ultraviolet light source; The ultraviolet light source has a peak wavelength of 258nm ± 2nm and a spectral half-width of 10nm.

[0008] Preferably, the neutral attenuator assembly includes four metrologically calibrated ultraviolet-specific neutral attenuators, each with a nominal transmittance of 1%. The beam energy can be adjusted by selecting a single attenuator or by stacking multiple attenuators. The variable aperture can be configured with two apertures with different light transmission diameters, and the nominal attenuation rates of the two apertures are 10% and 1%, respectively; The variable aperture, in conjunction with the neutral density filter array, adjusts the beam energy to maintain an irradiance of 0.1 μW / cm² at the exit of the second integrating sphere. 2 -1μW / cm 2 Adjustable within the range.

[0009] Preferably, the diameter of the first integrating sphere is 100 mm, and the diameter of the second integrating sphere is 500 mm; The inner walls of both the first integrating sphere and the second integrating sphere are coated with a high-reflectivity coating, which has a reflectivity greater than 95% in the 250nm-2500nm wavelength range. The diameter of the light outlet of the second integrating sphere is 100mm.

[0010] Preferably, the support component is a triangular support frame formed by overlapping multiple profiles, and the bottom of the support component is provided with adjustable feet. The adjustable feet are used to adjust the height of the second integrating sphere so that its light outlet is aligned with the light inlet.

[0011] Preferably, the darkroom is a sealed box structure with light-absorbing inner walls, and the bottom of the darkroom is provided with supporting feet; the darkroom is used to isolate stray light from the external environment and provide a dark optical environment for testing.

[0012] Preferably, the camera assembly includes a lead screw moving module and a lifting adjustment seat. The lead screw moving module is fixed on the inner bottom surface of the darkroom chamber along the incident optical axis. The handwheel is connected to the lead screw moving module in a transmission manner. Rotating the handwheel can drive the slide of the lead screw moving module to translate along the optical axis. The lifting adjustment seat is fixedly installed on the top surface of the slide table of the lead screw moving module, and the ultraviolet camera under test is fixed on the top of the lifting adjustment seat to adjust the height of the camera.

[0013] Preferably, a slider is slidably fitted on the linear guide rail, a mounting base is fixedly connected to the slider, the mounting base is fixed to the slider, and the ultraviolet radiometer is fixed to the mounting base; The slider is equipped with fasteners for locking the position of the ultraviolet radiometer.

[0014] A method for testing the sensitivity of ultraviolet light detection includes the following steps: S1. Open the darkroom chamber and move the ultraviolet radiometer along the linear guide rail to the calibration position coaxial with the entrance aperture; S2. Close the darkroom chamber to create a dark environment. In the completely dark state with the ultraviolet light source unit turned off, collect the background stray light value of the darkroom through an ultraviolet radiometer, and simultaneously collect the dark field response data of the ultraviolet camera under test. Turn on the ultraviolet light source unit and switch the neutral density filter group and the variable aperture in sequence. Use the ultraviolet radiometer with coaxial calibration to calibrate the absolute irradiance of the incident surface at each setting, and generate a setting-irradiance calibration table. S3. Open the darkroom chamber and move the UV radiometer back to the non-main optical path area; at the same time, precisely move the UV camera under test to the test position coaxial with the entrance aperture and adjust it to the preset object distance. S4. Close the darkroom chamber and let it stand for a preset time until the light source and the chamber environment are stable. Then, outside the chamber, switch the neutral attenuation filter group and the variable aperture to the target test setting and simultaneously collect the imaging response data of the ultraviolet camera under test. S5. Switch between different settings of the neutral attenuation filter group and the variable aperture in sequence, repeat S4, and obtain multiple sets of camera response data under different irradiance gradients. S6. According to the gear-irradiance calibration table obtained in S2, find the absolute irradiance of the incident surface corresponding to each gear and use it as the irradiance L of the incident surface at the current moment. Calculate the irradiance E of the detector target surface of the camera under test. Then, calculate the ratio of the camera response value under each irradiance gradient to the corresponding target surface irradiance E to obtain the light detection sensitivity of the ultraviolet camera under test.

[0015] Preferably, the radiance of the incident surface is converted into the irradiance E of the target surface of the camera detector, as shown in the following formula: ; In the formula, To calibrate the obtained incident surface radiance, The transmittance of the optical lens of the ultraviolet camera under test is measured in the test wavelength band. For the lens focal length, For object distance, The aperture of the lens; Compare the camera response values ​​under each irradiance gradient with the corresponding target surface irradiance. The light detection sensitivity of the camera under test is obtained by performing ratio calculation.

[0016] Therefore, this invention provides an ultraviolet light detection sensitivity testing device and method, which has the following beneficial effects: This invention uses a dual-integral-sphere homogenizing assembly composed of a 100mm first integrating sphere and a 500mm second integrating sphere. The inner walls of both integrating spheres are coated with a high-reflectivity coating. The light-emitting aperture of the second integrating sphere has a diameter of 100mm, and the irradiance uniformity of the light-emitting surface is better than 96%. Compared with the existing single-integral-sphere system, which has the defect of significant illuminance attenuation at the edge of the light-emitting aperture, this invention eliminates the non-uniformity introduced by the light source directivity and attenuation plate group through dual-integral-sphere secondary homogenization, providing a large-area uniform surface light source for ultraviolet camera sensitivity testing.

[0017] This invention employs a neutral density filter assembly combined with a two-stage variable aperture to achieve an irradiance of 0.1 μW / cm² at the light exit port of the second integrating sphere. 2 ~1μW / cm 2 Adjustable within a wide range. Compared to existing technologies where a single attenuation method struggles to balance a large dynamic range with fine adjustment, this invention achieves continuously adjustable dynamic range for weak ultraviolet light through the combination of an attenuator and a variable aperture. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an ultraviolet light detection sensitivity testing device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of an ultraviolet light detection sensitivity testing device according to an embodiment of the present invention; Figure 3 This is a front view of an ultraviolet light detection sensitivity testing device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the optical principle of an ultraviolet light detection sensitivity testing device according to an embodiment of the present invention; Figure Labels 1. Support platform; 2. Support assembly; 21. Adjustable feet; 3. Dual integrating sphere homogenizing assembly; 31. First integrating sphere; 32. Second integrating sphere; 321. Light exit port; 322. Entrance interface; 4. Ultraviolet light source attenuation unit; 41. Ultraviolet light source unit; 42. Neutral density filter group; 43. Variable aperture; 5. Dark chamber; 51. Light entrance aperture; 52. Support feet; 6. Ultraviolet radiometer; 61. Linear guide rail; 62. Slider; 63. Mounting base; 64. Fasteners; 7. Camera mounting and adjustment assembly; 71. Lead screw moving module; 72. Lifting and adjusting base; 73. Handwheel; 8. Ultraviolet camera under test. Detailed Implementation

[0019] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0022] Example like Figure 1-4 As shown, the present invention provides an ultraviolet light detection sensitivity testing device and method. The device includes a support platform 1, and a support component 2, a dual integrating sphere homogenizing component 3, an ultraviolet light source attenuation unit 4, a dark chamber 5, an ultraviolet radiometer 6, and a camera assembly and adjustment component 7, all mounted on the support platform 1.

[0023] The support platform 1 is a high-rigidity, flat optical experimental platform. The support assembly 2 and the dark chamber 5 are both placed on the platform 1. The support assembly 2 is a triangular support frame made of multiple profiles, which is structurally stable and has a strong load-bearing capacity. The bottom of the support assembly 2 is equipped with adjustable feet 21. By adjusting the height of the adjustable feet 21, the height of the second integrating sphere 32 can be adjusted so that its light exit port 321 is aligned with the light entrance port 51 of the dark chamber 5.

[0024] The dual integrating sphere homogenizing assembly 3 includes a first integrating sphere 31 and a second integrating sphere 32. The second integrating sphere 32 is fixedly mounted on the top of the support assembly 2, and the first integrating sphere 31 is disposed above the second integrating sphere 32. In this embodiment, the diameter of the first integrating sphere 31 is 100 mm, and the diameter of the second integrating sphere 32 is 500 mm. The inner walls of both the first integrating sphere 31 and the second integrating sphere 32 are coated with a high-reflectivity coating. The high-reflectivity coating has a reflectivity greater than 95% in the 250 nm to 2500 nm wavelength range, so that the ultraviolet light beam entering the integrating sphere is fully homogenized after multiple diffuse reflections, eliminating the directional non-uniformity of the light source itself.

[0025] The second integrating sphere 32 has a light exit port 321 on the side wall facing the dark chamber 5, and the diameter of the light exit port 321 is 100mm. The dark chamber 5 has a light entrance hole 51 on the side wall facing the second integrating sphere 32, and the light exit port 321 is directly opposite to the light entrance hole 51 and is sealed together.

[0026] An incident interface 322 is provided at the top of the second integrating sphere 32. The ultraviolet light source attenuation unit 4 includes an ultraviolet light source unit 41, a neutral density filter group 42, and a variable aperture 43. The variable aperture 43, the first integrating sphere 31, the neutral density filter group 42, and the ultraviolet light source unit 41 are connected sequentially from top to bottom along the incident direction of the beam at the incident interface 322. That is, the ultraviolet beam is emitted from the ultraviolet light source unit 41, passes through the neutral density filter group 42, enters the first integrating sphere 31 for homogenization, enters the second integrating sphere 32 for secondary diffuse reflection homogenization after passing through the variable aperture 43, and finally enters the dark chamber 5 through the light exit port 321. After being emitted from the ultraviolet light source unit 41, the light beam is transmitted downwards. After being homogenized once by the first integrating sphere 31, it enters the second integrating sphere 32 through the variable aperture 43. The variable aperture 43 is set in the optical path between the first integrating sphere 31 and the second integrating sphere 32 to control the cross section of the light beam entering the second integrating sphere 32, thereby realizing the adjustment of the irradiance at the light outlet 321.

[0027] The ultraviolet light source unit 41 includes a deep ultraviolet light source and a heat dissipation structure. In this embodiment, the peak wavelength of the ultraviolet light source is 258nm±2nm, and the spectral half-bandwidth is 10nm. The heat dissipation structure is attached to the outside of the ultraviolet light source to dissipate the heat generated by the light source in a timely manner, preventing heat accumulation that could cause wavelength drift or a decrease in output power. The ultraviolet light source unit 41 also includes a constant current power supply module and a temperature control module. The constant current power supply module provides a stable drive current, and the temperature control module adjusts the heat dissipation power of the heat dissipation structure according to the real-time monitored temperature signal, ensuring that the radiation stability of the ultraviolet light source unit 41 is better than 0.5% / h, providing a stable light source guarantee for long-term multi-gradient testing.

[0028] The neutral attenuator assembly 42 comprises four metrologically calibrated ultraviolet-specific neutral attenuators, each with a nominal transmittance of 1%. The purpose of setting up the neutral attenuator assembly 42 in the optical path is to achieve a large attenuation of the ultraviolet beam. By selecting a single piece or combining multiple pieces, significant energy attenuation at multiple levels can be achieved.

[0029] The variable aperture 43 is equipped with two apertures with different aperture sizes, and the nominal attenuation rates of the two apertures are 10% and 1%, respectively. The variable aperture 43, together with the neutral density filter group 42, adjusts the beam energy to ensure that the irradiance at the light exit port 321 of the second integrating sphere 32 is 0.1 μW / cm². 2 ~1μW / cm 2 Adjustable within a certain range. This covers the weak light signal range required for sensitivity testing of solar-blind ultraviolet cameras, effectively assessing the camera's detection limits under low-light conditions.

[0030] The dark chamber 5 is a sealed box structure with light-absorbing inner walls. Support legs 52 are provided at the bottom of the dark chamber 5, which fix the dark chamber 5 to the platform 1. The inner walls of the dark chamber 5 are coated with a light-absorbing material, which absorbs stray light incident on the inner walls of the chamber, preventing light from entering the camera's field of view after multiple reflections inside the chamber, thus providing a dark optical environment for testing.

[0031] The dark chamber 5 houses an ultraviolet radiometer 6, a linear guide rail 61, and an ultraviolet camera 8 to be measured. The linear guide rail 61 is fixedly mounted on the inner bottom surface of the dark chamber 5 along a direction perpendicular to the incident optical axis. A slider 62 is slidably fitted onto the linear guide rail 61, and a mounting base 63 is fixedly connected to the slider 62. The ultraviolet radiometer 6 is fixedly mounted on the mounting base 63. A fastener 64, a locking bolt, is provided on the slider 62 to lock the slider 62 onto the linear guide rail 61, thereby fixing the position of the ultraviolet radiometer 6. The ultraviolet radiometer 6 can move along the linear guide rail 61 with the mounting base 63 to a position coaxial with the entrance aperture 51 for irradiance calibration. The minimum measurement accuracy of the ultraviolet radiometer 6 is 1×10⁻⁶. -8 W / cm 2 Furthermore, the calibration is performed by a legal metrology department to ensure the accuracy and traceability of the calibrated values.

[0032] The UV camera 8 under test is mounted inside the dark chamber 5 via a camera mounting and adjustment assembly 7. The camera mounting and adjustment assembly 7 includes a lead screw moving module 71 and a lifting adjustment seat 72. The lead screw moving module 71 is fixed to the inner bottom surface of the dark chamber 5 along the incident optical axis. One end of the lead screw moving module 71 is equipped with a handwheel 73, which is connected to the lead screw of the lead screw moving module 71. Rotating the handwheel 73 drives the slide of the lead screw moving module 71 to translate along the optical axis, thereby adjusting the position of the UV camera 8 under test in the optical axis direction, i.e., adjusting the object distance. The lifting adjustment seat 72 is fixedly installed on the top surface of the slide of the lead screw moving module 71. The lifting adjustment seat 72 is a scissor-type lifting platform or a precision screw lifting platform, used to adjust the installation height of the UV camera 8 under test. The UV camera 8 under test is fixedly installed on the top of the lifting adjustment seat 72. By adjusting the camera height through the lifting adjustment seat 72, the optical axis of the camera is aligned with the central axis of the entrance aperture 51.

[0033] In this embodiment, a method for testing the ultraviolet light detection sensitivity based on the above-described device is also provided, comprising the following steps: S1. Open the dark chamber 5, install the ultraviolet camera 8 to be measured on the camera mounting assembly 7, and move the ultraviolet radiometer 6 along the linear guide rail 61 to the calibration position coaxial with the light entrance aperture 51, that is, directly behind the light entrance aperture.

[0034] S2. Close the dark chamber 5 to form a light-proof dark environment, then turn on the ultraviolet light source unit 41, and switch the neutral attenuation plate group 42 and the variable aperture 43 at each level in sequence. Use the ultraviolet radiometer 6, which is in the coaxial calibration position, to calibrate the absolute irradiance value at the light outlet 321 at each level, and generate a level-absolute irradiance calibration table.

[0035] S3. Open the dark chamber 5, move the UV radiometer 6 back to the non-main optical path area along the linear guide rail 61, that is, away from the beam irradiation range, and lock it in place with fasteners 64; at the same time, move the UV camera 8 under test precisely to the test position coaxial with the light entrance aperture 51 through the lead screw moving module 71 and the lifting adjustment seat 72, and adjust it to the preset object distance.

[0036] S4. Close the darkroom chamber 5 and let it stand for a preset time until the light source and the environment inside the chamber are stable. Then, outside the chamber, switch the neutral attenuation filter group 42 and the variable aperture 43 to the target test setting and collect the imaging response data of the ultraviolet camera 8 under test.

[0037] S5. Switch between different settings of neutral attenuation filter group 42 and variable aperture 43 in sequence, repeat step S4, and obtain multiple sets of camera response data under different irradiance gradients.

[0038] S6. Based on the gear-absolute irradiance calibration table obtained in step S2, find the absolute irradiance value of the incident surface corresponding to the current gear, and use it as the irradiance L of the incident surface at the current moment. Then, convert the irradiance of the incident surface into the irradiance E of the detector target surface of the camera under test, using the following formula: ; In the formula, To calibrate the obtained incident surface radiance, The transmittance of the optical lens of the ultraviolet camera under test is measured in the test wavelength band. For the lens focal length, For object distance, The aperture of the lens; Compare the camera response values ​​under each irradiance gradient with the corresponding target surface irradiance. The ratio is calculated to obtain the light detection sensitivity of the camera under test, and the average value of the sensitivity under each gradient is taken as the final light detection sensitivity index of the camera.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An ultraviolet light detection sensitivity testing device, characterized in that: The device includes a support platform, a support assembly, a dual integrating sphere homogenizing assembly, an ultraviolet light source attenuation unit, and an anechoic chamber, all mounted on the support platform. The dual integrating sphere homogenizing assembly includes a first integrating sphere and a second integrating sphere. The second integrating sphere is fixed to the support platform by the support assembly. The second integrating sphere has a light outlet on the side wall of the anechoic chamber, and the side wall of the anechoic chamber has a light inlet. The light outlet and the light inlet correspond to each other and are sealed together. The ultraviolet light source attenuation unit includes an ultraviolet light source unit, a neutral density filter group, and a variable aperture. The top of the second integrating sphere has an incident interface, and the variable aperture, the first integrating sphere, the neutral density filter group, and the ultraviolet light source unit are connected in sequence at the incident interface. The dark chamber is equipped with an ultraviolet radiometer, a linear guide rail, and a UV camera under test. The ultraviolet radiometer is mounted on the linear guide rail via a mounting base and moves along the linear guide rail. The UV camera under test is placed inside the dark chamber via a camera adjustment assembly. The UV camera under test is coaxially arranged with the light entrance aperture.

2. The ultraviolet light detection sensitivity testing device according to claim 1, characterized in that: The ultraviolet light source unit includes an ultraviolet light source and a heat dissipation module, wherein the heat dissipation module is attached to the outside of the ultraviolet light source; The ultraviolet light source has a peak wavelength of 258nm ± 2nm and a spectral half-width of 10nm.

3. The ultraviolet light detection sensitivity testing device according to claim 2, characterized in that: The neutral attenuator assembly includes four metrologically calibrated ultraviolet-specific neutral attenuators. The nominal transmittance of a single neutral attenuator is 1%. By selecting a single attenuator or combining multiple attenuators, a large-scale attenuation adjustment of the beam energy can be achieved. The variable aperture can be configured with two apertures with different light transmission diameters, and the nominal attenuation rates of the two apertures are 10% and 1%, respectively; The variable aperture, in conjunction with the neutral density filter array, adjusts the beam energy to maintain an irradiance of 0.1 μW / cm² at the exit of the second integrating sphere. 2 -1μW / cm 2 Adjustable within the range.

4. The ultraviolet light detection sensitivity testing device according to claim 3, characterized in that: The diameter of the first integrating sphere is 100 mm, and the diameter of the second integrating sphere is 500 mm; The inner walls of both the first integrating sphere and the second integrating sphere are coated with a high-reflectivity coating, which has a reflectivity greater than 95% in the 250nm-2500nm wavelength range. The diameter of the light outlet of the second integrating sphere is 100mm.

5. The ultraviolet light detection sensitivity testing device according to claim 4, characterized in that: The support component is a triangular support frame made of multiple profiles. The bottom of the support component is provided with adjustable feet, which are used to adjust the height of the second integrating sphere so that its light outlet is aligned with the light inlet.

6. The ultraviolet light detection sensitivity testing device according to claim 5, characterized in that: The dark chamber is a sealed box structure with light-absorbing inner walls, and the bottom of the dark chamber is equipped with supporting feet; the dark chamber is used to isolate stray light from the external environment and provide a dark optical environment for testing.

7. The ultraviolet light detection sensitivity testing device according to claim 6, characterized in that: The camera assembly includes a lead screw moving module and a lifting adjustment seat. The lead screw moving module is fixed on the inner bottom surface of the dark chamber along the incident optical axis. The handwheel is connected to the lead screw moving module in a transmission connection. Rotating the handwheel can drive the slide of the lead screw moving module to move along the optical axis. The lifting adjustment seat is fixedly installed on the top surface of the slide table of the lead screw moving module, and the ultraviolet camera under test is fixed on the top of the lifting adjustment seat to adjust the height of the camera.

8. The ultraviolet light detection sensitivity testing device according to claim 7, characterized in that: A slider is slidably fitted on the linear guide rail, and a mounting base is fixedly connected to the slider. The mounting base is fixed to the slider, and the ultraviolet radiometer is fixed to the mounting base. The slider is equipped with fasteners for locking the position of the ultraviolet radiometer.

9. A method for testing ultraviolet light detection sensitivity, based on the ultraviolet light detection sensitivity testing device according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Open the darkroom chamber and move the ultraviolet radiometer along the linear guide rail to the calibration position coaxial with the entrance aperture; S2. Close the darkroom chamber to create a dark environment. In the completely dark state with the ultraviolet light source unit turned off, collect the background stray light value of the darkroom through an ultraviolet radiometer, and simultaneously collect the dark field response data of the ultraviolet camera under test. Turn on the ultraviolet light source unit and switch the neutral density filter group and the variable aperture in sequence. Use the ultraviolet radiometer with coaxial calibration to calibrate the absolute irradiance of the incident surface at each setting, and generate a setting-irradiance calibration table. S3. Open the darkroom chamber and move the UV radiometer back to the non-main optical path area; at the same time, precisely move the UV camera under test to the test position coaxial with the entrance aperture and adjust it to the preset object distance. S4. Close the darkroom chamber and let it stand for a preset time until the light source and the chamber environment are stable. Then, outside the chamber, switch the neutral attenuation filter group and the variable aperture to the target test setting and simultaneously collect the imaging response data of the ultraviolet camera under test. S5. Switch between different settings of the neutral attenuation filter group and the variable aperture in sequence, repeat S4, and obtain multiple sets of camera response data under different irradiance gradients. S6. According to the gear-irradiance calibration table obtained in S2, find the absolute irradiance of the incident surface corresponding to each gear and use it as the irradiance L of the incident surface at the current moment. Calculate the irradiance E of the detector target surface of the camera under test. Then, calculate the ratio of the camera response value under each irradiance gradient to the corresponding target surface irradiance E to obtain the light detection sensitivity of the ultraviolet camera under test.

10. The ultraviolet light detection sensitivity testing method according to claim 9, characterized in that: The radiance of the incident surface is converted into the irradiance E of the target surface of the camera detector using the following formula: ； In the formula, To calibrate the obtained incident surface radiance, The transmittance of the optical lens of the ultraviolet camera under test is measured in the test wavelength band. For the lens focal length, For object distance, The aperture of the lens; Compare the camera response values ​​under each irradiance gradient with the corresponding target surface irradiance. The light detection sensitivity of the camera under test is obtained by performing ratio calculation.

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