Full-waveband optical characteristic measuring system

Abstract

The invention discloses a full-band optical characteristic measurement system. Comprising an emitting device which comprises a laser emitting unit and a visible light emitting unit; the collimation optical device comprises an integrator and a first collimating mirror which are sequentially arranged along the propagation direction of light; the detection device comprises a detector, a first lens and a plurality of attenuation slice wheels; the detector is suitable for visible light bands and laser bands in a preset range; the first lens is arranged at the front end of the detector; each attenuation slice wheel is coaxially arranged at the front end of the first lens; each attenuation piece wheel is provided with a plurality of circular clamping positions which are evenly distributed in the circumferential direction of the attenuation piece wheel, and the clamping positions are used for fixing attenuation pieces with different attenuation multiples. During measurement, the target attenuation piece meeting the requirement is determined according to the intensity of the detection light beam so that the axis of the target attenuation piece can coincide with the axis of the first lens, and the first lens and the detector are used for measuring the optical characteristics of the measured object. The full-wave-band optical characteristics can be measured, and the measurement efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of optical measurement, and in particular to a full-band optical property measurement system. Background Art

[0002] Optical measurement is a non-contact measurement technology that uses some basic properties of light, such as reflection, interference, and scattering, to perform relevant precise measurements. The main principle is to use the physical properties of light to detect the object being measured. Different measurement methods use different properties.

[0003] At present, when measuring objects in the laboratory, it is usually divided into visible light testing and laser testing. Since the testing principles of the two light sources are different, when different light sources are used for testing, the detection system and the emission system need to be frequently replaced, which affects the test efficiency. In other words, there is no measurement system that can meet the full-band optical characteristics in the relevant technology.

[0004] Therefore, there is an urgent need for a full-band optical property measurement system to solve the above problems. Summary of the invention

[0005] The present invention provides a full-band optical property measurement system, which can meet the full-band optical property measurement and improve the measurement efficiency. The technical solution is as follows:

[0006] The present invention provides a full-band optical property measurement system, comprising:

[0007] An emitting device, comprising a laser emitting unit and a visible light emitting unit, wherein the laser emitting unit is used to emit laser light, and the visible light emitting unit is used to emit visible light;

[0008] A collimating optical device, comprising an integrator and a first collimating mirror arranged in sequence along the propagation direction of light; the integrator is used to adjust the incident visible light or laser into a uniform light beam, and the first collimating mirror is used to reflect the uniform light beam onto the object to be measured;

[0009] A detection device, comprising a detector, a first lens and a plurality of attenuation sheet wheels; the detector is suitable for a visible light band and a laser band within a preset range; the first lens is arranged at the front end of the detector; each of the attenuation sheet wheels is coaxially arranged at the front end of the first lens; each of the attenuation sheet wheels is provided with a plurality of circular clamping positions evenly distributed along its circumference, and each of the clamping positions is used to fix attenuation sheets with different attenuation multiples;

[0010] During measurement, the laser emitting unit or the visible light emitting unit is turned on according to the measurement requirements to emit a corresponding light beam; according to the intensity of the light beam, a target attenuation sheet that meets the requirements is determined, and the position of each attenuation sheet wheel is adjusted so that the axis of the target attenuation sheet coincides with the axis of the first lens, and the optical properties of the object under measurement are measured using the first lens and the detector.

[0011] The embodiment of the present invention provides a full-band optical property measurement system. First, by setting a collimating optical device, visible light or laser can be reflected onto the object to be measured, so that the measurement system is applicable to various light sources and bands. By setting multiple attenuation sheets and setting multiple attenuation sheets with different attenuation ratios on each attenuation sheet wheel, the target attenuation sheet that meets the requirements can be determined according to the type and intensity of the light source. Finally, by adjusting the position of each attenuation sheet wheel, the axis of the target attenuation sheet coincides with the axis of the first lens, so that the optical properties of the object to be measured are measured using the first lens and the detector, and the optical property measurement of various light sources and bands can be achieved. It can be seen that the measurement system provided by the present application is not only applicable to visible light, but also to laser, and meets the requirements of full-band measurement; in addition, there is no need to replace the transmitting device and the detecting device according to the type of light source, and the measurement efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 is a schematic diagram of a full-band optical property measurement system provided by an embodiment of the present invention;

[0014] Figure 2 is a combined schematic diagram of a transmitting device and a collimating optical device provided by an embodiment of the present invention;

[0015] Figure 3 is a schematic diagram of a laser emitting unit provided in one embodiment of the present invention;

[0016] Figure 4 is a schematic diagram of a detection device provided by an embodiment of the present invention;

[0017] Figure 5 Schematic diagram of a background simulation device provided by an embodiment of the present invention.

[0018] Reference numerals:

[0019] 1- Launching device;

[0020] 11-Laser emitting unit;

[0021] 111-laser; 112-second collimator; 113-fiber coupling mirror; 114-fiber jumper; 115-relay mirror; 116-dichroic beam combiner; 117-third collimator; 118-total reflector; 119-laser reflector;

[0022] 12- visible light emitting unit;

[0023] 2-collimation optics;

[0024] 21-light path reflector; 22-integrator; 23-first collimator;

[0025] 3-Detection device;

[0026] 31-detector; 32-first lens; 33-attenuation sheet wheel; 34-attenuation sheet; 35-brightness meter; 36-second lens; 37-box; 38-light shield;

[0027] 4- Background simulation device;

[0028] 41-background reflective surface; 42-moving module; 43-follow-up module; 44-black background plate; 45-cooling pipe;

[0029] 5-control device; 6-object to be measured. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] The specific implementation of the above concept is described below.

[0032] Please refer to Figure 1 to Figure 4 The embodiment of the present invention provides a full-band optical property measurement system, including:

[0033] The emitting device 1 comprises a laser emitting unit 11 and a visible light emitting unit 12, wherein the laser emitting unit 11 is used to emit laser light, and the visible light emitting unit 12 is used to emit visible light;

[0034] The collimating optical device 2 comprises an integrator 22 and a first collimating mirror 23 which are sequentially arranged along the propagation direction of the light; the integrator 22 is used to adjust the incident visible light or laser into a uniform light beam, and the first collimating mirror 23 is used to reflect the uniform light beam onto the measured object 6;

[0035] The detection device 3 comprises a detector 31, a first lens 32 and a plurality of attenuation sheet wheels 33; the detector 31 is suitable for a visible light band and a laser band within a preset range; the first lens 32 is arranged at the front end of the detector 31; each attenuation sheet wheel 33 is coaxially arranged at the front end of the first lens 32; each attenuation sheet wheel 33 is provided with a plurality of circular clamping positions evenly distributed along its circumference, and each clamping position is used to fix attenuation sheets 34 with different attenuation multiples;

[0036] During measurement, the laser emitting unit 11 or the visible light emitting unit 12 is turned on according to the measurement requirements to emit the corresponding light beam; according to the intensity of the light beam, the target attenuation plate 34 that meets the requirements is determined, and the position of each attenuation plate wheel 33 is adjusted so that the axis of the target attenuation plate 34 coincides with the axis of the first lens 32, and the first lens 32 and the detector 31 are used to measure the optical properties of the object 6 to be measured.

[0037] In this embodiment, firstly, by setting the collimating optical device 2, visible light or laser can be reflected onto the object to be measured 6, so that the measurement system is applicable to various light sources and wavebands. By setting a plurality of attenuation sheet wheels 33 and setting a plurality of attenuation sheets 34 with different attenuation magnifications on each attenuation sheet wheel 33, the target attenuation sheet 34 that meets the requirements can be determined according to the type and intensity of the light source. Finally, by adjusting the position of each attenuation sheet wheel 33, the axis of the target attenuation sheet 34 coincides with the axis of the first lens 32, so that the optical properties of the object to be measured 6 are measured using the first lens 32 and the detector 31, and the optical properties of various light sources and wavebands can be measured. It can be seen that the measurement system provided by the present application is not only applicable to visible light, but also to laser, and meets the full-band measurement; in addition, there is no need to replace the emitting device 1 and the detecting device 3 according to the type of light source, and the measurement efficiency is high.

[0038] It should be noted that the present application does not impose any specific limitation on the specific form of the visible light emitting unit 12 , as long as it can emit visible light that meets the user's requirements.

[0039] It should also be noted that when the light intensity does not need to be attenuated, the attenuation sheet 34 may not be installed on the attenuation sheet wheel 33. In this case, the axis of the position where the attenuation sheet 34 is not installed can be coincident with the axis of the first lens 32. In addition, when multiple attenuation is required, an attenuation sheet 34 can be selected from multiple attenuation sheet wheels 33, and the axes of multiple attenuation sheets 34 can be coincident with the axis of the first lens 32 at the same time, so as to achieve the effect of multiple attenuation. In addition, a laser band of 1000nm to 1600nm can be selected. Of course, other bands can also be used, and this application does not make specific limitations.

[0040] like Figure 3 As shown, in some embodiments, the laser emitting unit 11 includes at least one laser 111 and a beam shaping and expanding optical module;

[0041] Each laser 111 is used to emit laser light of different powers, and the beam shaping and expanding optical module is used to adjust the laser light emitted by each laser 111 into a laser beam with a preset divergence angle.

[0042] In this embodiment, there is no high mode requirement for the laser 111 to measure the reflection characteristics of the measured object 6, so the laser 111 uses one or two high-power, multi-mode, continuous semiconductor lasers 111. The working envelope of each laser 111 is 1.06±0.03um and 1.55±0.03um respectively. Of course, other types of lasers 111 can also be used, and this application does not make specific restrictions.

[0043] It should be noted that, if the number of lasers 111 used is different, the components of the beam shaping and expanding optical module will also be different.

[0044] In some embodiments, when the number of lasers 111 is one, the beam shaping and expanding optical module includes a second collimator 112, a fiber coupling mirror 113, a fiber jumper 114, a relay mirror 115, and a laser reflector 119, which are sequentially arranged along the laser propagation direction;

[0045] The second collimator 112 is used to collimate the elliptical light spot output by the laser 111 into a parallel circular light spot; the fiber coupling mirror 113 is used to couple the incident parallel light beam; the fiber jumper 114 is used to homogenize the incident laser; the relay mirror 115 is used to adjust the divergence angle of the output laser so that the emitted laser light beam meets the preset divergence angle; the laser reflector 119 is used to introduce the laser light beam into the collimating optical device 2.

[0046] In this embodiment, since the divergence angle of the laser emitted from the optical fiber usually does not meet the divergence angle requirement during the actual experiment, it is necessary to use a relay mirror 115 to adjust the divergence angle of the emitted laser. The inventor found that when the divergence angle is not greater than 13°, the laser can cover the object 6 to be measured. Therefore, the preset divergence angle is not greater than 13°. In addition, the core diameter of the optical fiber jumper 114 is 0.6 mm, and the numerical aperture NA is 0.22. Of course, other sizes can also be used, and this application does not make specific restrictions.

[0047] In some embodiments, when the number of lasers 111 is two, the beam shaping and expanding optical module further includes a dichroic beam combining mirror 116, a third collimating mirror 117, and a total reflecting mirror 118, and the dichroic beam combining mirror 116 is disposed between the second collimating mirror 112 and the fiber coupling mirror 113;

[0048] The third collimator 117 is used to collimate the elliptical light spot output by another laser 111 into a parallel circular light spot, and the circular light spot is incident on the total reflection mirror 118; the total reflection mirror 118 is used to reflect all the incident laser light onto the dichroic beam combiner 116; the dichroic beam combiner 116 is used to reflect the laser light incident from the total reflection mirror 118 onto the fiber coupling mirror 113, and transmit the laser light incident from the second collimator 112 to the fiber coupling mirror 113.

[0049] In this embodiment, the second collimator 112 and the third collimator 117 are used to collimate the elliptical spot output by the laser 111 into a circular spot that is emitted in parallel, so that the interface of the two laser beams after the beam combination remains basically consistent, thereby better coupling into the optical fiber. The dichroic beam combiner 116 can be highly reflective to a laser of one wavelength and highly transparent to a laser of another wavelength, so that the two laser beams can be combined conveniently with low loss. The fiber jumper 114 can make the emitted laser more uniform, and in particular can effectively suppress laser speckle. The formation of laser speckle lies in the spontaneous interference of the laser, forming a granular pattern in the cross section of the laser beam, which seriously affects the uniformity of the emitted laser.

[0050] In some embodiments, the collimating optical device 2 further includes at least one light path reflector 21; the light path reflector 21 is disposed at the front end of the integrator 22;

[0051] The optical path reflector 21 is used to reflect the visible light emitted by the visible light emitting unit 12 or the laser reflected by the laser reflector 119 to the integrator 22 .

[0052] In this embodiment, since a certain optical path is required between the visible light emitted by the visible light emitting unit 12 and the laser reflected by the laser reflector 119 and the integrator 22, the entire system occupies a relatively large site length. However, the present application can realize multiple reflections of the light beam by setting at least one optical path reflector 21, thereby reducing the planar expansion volume of the entire system while meeting the optical path requirement.

[0053] In some embodiments, the collimating optical device 2 further includes a rotation module, and the first collimating mirror 23 is disposed on the rotation module, and the rotation module is used to adjust the azimuth and elevation angles of the first collimating mirror 23. By adjusting the azimuth and elevation angles of the first collimating mirror 23, the light beam can be irradiated onto the measured object 6. In addition, the first collimating mirror 23 adopts a large-diameter collimating mirror.

[0054] like Figure 4 As shown, in some embodiments, the detection device 3 further includes a brightness meter 35 and a second lens 36 disposed at the front end of the brightness meter 35;

[0055] When measuring the ambient brightness, the axis of the attenuation plate 34 that meets the requirements is adjusted to coincide with the axis of the second lens 36 , so that the brightness of the environment can be measured using the brightness meter 35 .

[0056] In this example, the luminance meter 35 can be provided to calibrate the on-site environment and measure the impact of the environment on the measurement in real time.

[0057] Furthermore, in some embodiments, each attenuation sheet wheel 33 is equipped with a motor, a driver, a motion controller, and a position measurement device, so as to facilitate the electrical driving of each attenuation sheet wheel 33 and the accurate positioning of the attenuation sheet 34 .

[0058] In some embodiments, the first lens 32 and the second lens 36 both include a focusing function and both include two-stage lens groups; wherein the first-stage lens group is a positive lens group and the second-stage lens group is a negative lens group. In addition, the optical effective aperture of the first-stage lens can be Φ125mm, and the focal length is designed to be 95mm; the optical effective aperture of the second-stage lens group can be Φ50.8mm, and the focal length is designed to be -50.8mm; the combination of the first-stage lens and the second-stage lens group has a 30° field of view.

[0059] In this embodiment, each lens is achromatic, mainly responsible for receiving weak echo signals, including focusing function, and the overall design is a Galilean telescope system. In addition, the second-stage lens group uses a negative lens group to effectively compress the volume of the optical system, and the Galilean telescope system forms a positive image, which is more convenient for human eyes to observe through the display.

[0060] like Figure 4 As shown, in some embodiments, it also includes a box 37 and two light shields 38;

[0061] The detector 31, the first lens 32, the brightness meter 35, the second lens 36 and each attenuation wheel 33 are all arranged in a box body 37; two through holes are arranged on the wall surface of the box body 37 on the side close to the attenuation wheel 33, wherein the axis of one through hole coincides with the axis of the first lens 32, and the axis of the other through hole coincides with the axis of the second lens 36; each light shielding hood 38 is respectively arranged on the outside of each through hole.

[0062] The inventors also found in their work that since the size and detection angle of the object 6 to be measured are variable, it is necessary to use a larger black background plate 44 and continuously adjust the position of the black background according to the position of the object 6 to be measured and the changes in the detection angle, which not only occupies laboratory space but also affects the measurement efficiency.

[0063] In order to solve the above problems, the inventor proposes a background simulation device 4 .

[0064] like Figure 5 As shown, the background simulation device 4 includes a background reflection surface 41, a moving module 42, a follower module 43 and a black background plate 44;

[0065] The detection device 3 is arranged on the mobile module 42, the background reflection surface 41 is arranged on the follower module 43, the mobile module 42 and the follower module 43 are respectively located on both sides of the measured object 6, and can rotate synchronously around the measured object 6; the black background plate 44 is suspended directly above the measured object 6;

[0066] When the infrared radiation characteristic test is performed on the object 6 to be measured, the angle between the background reflection surface 41 and the horizontal plane is adjusted so that the black background plate 44 fills the field of view of the detection device 3 to provide a black background for the object 6 to be measured.

[0067] In this embodiment, by suspending the black background plate 44 just above the object to be measured 6, the laboratory space can be saved. By designing the background reflection surface 41 and adjusting the angle between it and the horizontal plane, the black background plate 44 can fill the field of view of the detection device 3, thereby providing a black background for the object to be measured 6. In addition, by arranging the mobile module 42 and the follower module 43, when it is necessary to adjust the measurement angle, it is only necessary to rotate the mobile module 42 and the follower module 43 synchronously to quickly reach the required measurement angle without moving the black background plate 44. It can be seen that the present application can not only save space, but also improve measurement efficiency.

[0068] It should be noted that the detection device 3 preferably forms an angle of 180° with the background reflection surface 41 and is respectively arranged opposite to the object to be detected 6 , so as to facilitate following the angle change of the detection device 3 .

[0069] It should also be noted that the full band includes the visible light band, the laser band and the infrared band. When the visible light and the laser are used for optical testing, there is no need to cool the black background plate 44. However, when the infrared band is used for optical testing, the black background plate 44 needs to be cooled so that there is a temperature difference between it and the object 6 being tested.

[0070] Therefore, in some embodiments, when optical testing is performed using the infrared band, a cooling pipe 45 needs to be laid on the top surface of the black background plate 44, and a low-temperature liquid flows in the cooling pipe 45. The preset temperature is lower than the temperature of the object to be measured, and the difference between the preset temperature and the temperature of the object to be measured 6 is not less than 5°C.

[0071] In this step, by controlling the flow rate of the refrigerant in the pipeline, the temperature of the black background plate 44 can be controlled so that there is a significant temperature difference between the temperature of the black background plate 44 and the temperature of the measured object 6. In this way, the environmental influence of the measurement can be eliminated, and the detection device 3 can obtain data with uniform background and low noise, thereby improving the test accuracy.

[0072] In some embodiments, the black background plate 44 is made of an oxidized black aluminum plate, and the cooling pipe 45 is laid on the top surface of the black background plate 44 in a spiral shape.

[0073] By laying spiral pipes above the aluminum plate, the temperature of the aluminum plate can be quickly reduced and the heat exchange effect can be improved.

[0074] In some embodiments, the angle between the background reflection surface 41 and the horizontal plane is 30-60°, preferably 45°. Of course, the user can also choose other angles, as long as the electromagnetic waves emitted by the black background plate 44 are reflected to the detection device 3.

[0075] In some embodiments, a control device 5 is further included for controlling the laser emitting unit 11 , the visible light emitting unit 12 , the detector 31 , the first lens 32 , each attenuation wheel 33 , the brightness meter 35 , the second lens 36 , the moving module 42 and the follow-up module 43 .

[0076] By providing the control device 5, the above-mentioned equipment can be electrically driven and then quickly controlled.

[0077] It should be noted that, in this article, relational terms such as first, second, third and fourth are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0078] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A full-band optical property measurement system, characterized in that: include: A transmitting device (1) comprises a laser transmitting unit (11) and a visible light transmitting unit (12), wherein the laser transmitting unit (11) is used to transmit laser light, and the visible light transmitting unit (12) is used to transmit visible light; A collimating optical device (2) comprising an integrator (22) and a first collimating mirror (23) arranged in sequence along the propagation direction of light; the integrator (22) is used to adjust the incident visible light or laser light into a uniform light beam, and the first collimating mirror (23) is used to reflect the uniform light beam onto the object to be measured (6); A detection device (3), comprising a detector (31), a first lens (32) and a plurality of attenuation sheet wheels (33); the detector (31) is suitable for a visible light band and a laser band within a preset range; the first lens (32) is arranged at the front end of the detector (31); each of the attenuation sheet wheels (33) is coaxially arranged at the front end of the first lens (32); each of the attenuation sheet wheels (33) is provided with a plurality of circular clamping positions evenly distributed along its circumference, and each of the clamping positions is used to fix attenuation sheets (34) with different attenuation multiples; During measurement, the laser emission unit (11) or the visible light emission unit (12) is turned on according to measurement requirements to emit a corresponding light beam; a target attenuation sheet (34) that meets the requirements is determined according to the intensity of the light beam, and the position of each attenuation sheet wheel (33) is adjusted so that the axis of the target attenuation sheet (34) coincides with the axis of the first lens (32), and the optical characteristics of the object (6) to be measured are measured using the first lens (32) and the detector (31).

2. The system according to claim 1, characterized in that The laser emitting unit (11) comprises at least one laser (111) and a beam shaping and expanding optical module; Each of the lasers (111) is used to emit laser light of different powers, and the beam shaping and expanding optical module is used to adjust the laser light emitted by each of the lasers (111) into a laser light beam with a preset divergence angle.

3. The system according to claim 2, characterized in that When the number of the laser (111) is one, the beam shaping and expanding optical module comprises a second collimating mirror (112), a fiber coupling mirror (113), a fiber jumper (114), a relay mirror (115), and a laser reflecting mirror (119) which are sequentially arranged along the laser propagation direction; The second collimator (112) is used to collimate the elliptical light spot output by the laser (111) into a circular light spot that is emitted in parallel; the fiber coupling mirror (113) is used to couple the incident parallel light beam; the fiber jumper (114) is used to homogenize the incident laser; the relay mirror (115) is used to adjust the divergence angle of the emitted laser so that the emitted laser light beam meets a preset divergence angle; and the laser reflector (119) is used to introduce the laser light beam into the collimator optical device (2).

4. The system according to claim 3, characterized in that When the number of the lasers (111) is two, the beam shaping and expanding optical module further comprises a dichroic beam combining mirror (116), a third collimating mirror (117) and a total reflecting mirror (118); the dichroic beam combining mirror (116) is arranged between the second collimating mirror (112) and the optical fiber coupling mirror (113); The third collimator (117) is used to collimate the elliptical light spot output by another laser (111) into a circular light spot with parallel emission, and the circular light spot is incident on the total reflection mirror (118); the total reflection mirror (118) is used to reflect all the incident laser light onto the dichroic beam combiner (116); the dichroic beam combiner (116) is used to reflect the laser light incident from the total reflection mirror (118) onto the fiber coupling mirror (113), and transmit the laser light incident from the second collimator (112) to the fiber coupling mirror (113).

5. The system according to claim 1, characterized in that The detection device (3) further comprises a brightness meter (35) and a second lens (36) arranged at the front end of the brightness meter (35); When measuring the ambient brightness, the axis of the attenuation sheet (34) that meets the requirements is adjusted to coincide with the axis of the second lens (36), so that the brightness of the environment can be measured using the brightness meter (35).

6. The system according to claim 5, characterized in that It also includes a background simulation device (4); the background simulation device (4) includes a background reflection surface (41), a moving module (42), a follow-up module (43) and a black background plate (44); The detection device (3) is arranged on the mobile module (42), the background reflection surface (41) is arranged on the follower module (43), the mobile module (42) and the follower module (43) are respectively located on both sides of the object to be measured (6), and can rotate synchronously around the object to be measured (6); the black background plate (44) is suspended directly above the object to be measured (6); When the infrared radiation characteristic test is performed on the object to be measured (6), the angle between the background reflection surface (41) and the horizontal plane is adjusted so that the black background plate (44) fills the field of view of the detection device (3) to provide a black background for the object to be measured (6).

7. The system according to claim 6, characterized in that A cooling pipe (45) is laid on the top surface of the black background plate (44), and a low-temperature liquid flows in the cooling pipe (45). The low-temperature liquid is used to reduce the temperature of the black background plate (44) to a preset temperature, and the preset temperature is lower than the temperature of the object (6) to be measured.

8. The system according to claim 7, characterized in that The difference between the preset temperature and the temperature of the measured object (6) is not less than 5°C.

9. The system according to claim 6, characterized in that The black background plate (44) is made of an oxidized black aluminum plate.

10. The system according to claim 6, characterized in that It also includes a control device (5) for controlling the laser emitting unit (11), the visible light emitting unit (12), the detector (31), the first lens (32), each of the attenuation sheet wheels (33), the brightness meter (35), the second lens (36), the moving module (42) and the follow-up module (43).

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