Infrared radiation characteristic measurement system and measurement method

Abstract

The invention relates to an infrared radiation characteristic measuring system and method, and belongs to the technical field of infrared radiation characteristic measuring systems.The infrared radiation characteristic measuring system comprises a container, a medium-wave inner shell, a long-wave inner shell, medium-wave glass, long-wave glass, a nitrogen tank and an infrared radiation characteristic collecting system, a medium-wave thermal imager is fixed in the medium-wave inner shell, and a long-wave thermal imager is fixed in the long-wave inner shell; the medium-wave inner shell is provided with a medium-wave window hole; the medium-wave glass is sealed and fixed in the medium-wave window hole; the long-wave inner shell is provided with a long-wave window hole; the long-wave glass is sealed in the long-wave window hole; and the nitrogen tank is communicated with the medium-wave inner shell. The container is filled with liquid nitrogen through the liquid nitrogen generator, then the medium-wave inner shell is filled with nitrogen, the temperature control device is started, it can be ensured that the medium-wave thermal imager and the long-wave thermal imager work normally in the vacuum copious cooling environment, and an infrared radiation characteristic collecting system can conveniently collect working parameters of the vacuum copious cooling environment.

Description

Technical Field

[0001] The invention relates to the technical field of infrared radiation characteristic measurement systems, and in particular to an infrared radiation characteristic measurement system. Background Art

[0002] High-temperature objects will emit radiation energy of different wavelengths to the outside world. Infrared thermal imagers detect the invisible infrared radiation energy emitted by the target and convert it into visible thermal images to obtain the temperature field distribution and radiation intensity distribution on the target surface. To measure the infrared radiation characteristics of the target in the atmospheric environment, you only need to ensure that the target is within the camera's field of view. After focusing, you can start the experiment.

[0003] However, in a vacuum deep cold background environment, the infrared radiation characteristics measurement system cannot work normally. The main reasons are: ① The components inside the infrared thermal imager are not adapted to the vacuum deep cold background environment. For example, the infrared lens is often sealed with nitrogen. Exposing the camera directly to a vacuum environment will damage the experimental equipment. In order to simulate the actual ambient temperature in space, liquid nitrogen is introduced into the vacuum container to maintain the cabin environment at around 100K. Most materials cannot be used at this temperature. Therefore, the existing infrared radiation characteristics measurement system cannot be directly exposed to a vacuum deep cold environment and used normally; ② Under normal circumstances, quartz glass is often used to isolate the camera lens and the experimental environment to protect the camera. However, quartz glass has a high transmittance only near visible light, and is basically unable to transmit 3-5μm medium-wave infrared and 8-14μm long-wave infrared. Therefore, for infrared cameras of different measurement bands, infrared windows of different materials need to be selected to isolate the vacuum environment. However, the sapphire glass at the front end of the medium-wave thermal imager will produce a cold reflection spot in the center of the window, which will block the target.

[0004] Therefore, how to design an infrared radiation characteristic measurement system suitable for vacuum deep cooling and its use method is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The invention provides an infrared radiation characteristic measurement system, which solves the technical problem that the infrared radiation characteristic measurement system cannot work normally under a vacuum deep cold background environment.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: an infrared radiation characteristic measurement system, suitable for a vacuum cryogenic environment, comprising: a container, a medium-wave inner shell, a long-wave inner shell, a medium-wave glass, a long-wave glass, a nitrogen tank and an infrared radiation characteristic acquisition system,

[0007] The inlet of the container is connected with the outlet of the liquid nitrogen generator to simulate a vacuum deep cold environment in the container; the medium-wave inner shell and the long-wave inner shell are both placed in the container, a medium-wave thermal imager is fixed in the medium-wave inner shell, and the long-wave thermal imager is fixed in the long-wave inner shell; the medium-wave inner shell is provided with a medium-wave window corresponding to the transmitting end of the medium-wave thermal imager; the medium-wave glass is sealed at the medium-wave window; the long-wave inner shell is provided with a long-wave window corresponding to the transmitting end of the long-wave thermal imager; the long-wave glass is sealed at the long-wave window; the nitrogen tank and the infrared radiation characteristic acquisition system are both located outside the container, and the nitrogen tank is connected with the medium-wave inner shell through an air pipe; the infrared radiation characteristic acquisition system is electrically connected to the medium-wave thermal imager and the long-wave thermal imager respectively through power lines.

[0008] The beneficial effect of the present invention is that the liquid nitrogen generator is first used to fill the container with liquid nitrogen, and then the medium-wave inner shell is filled with nitrogen gas, which can ensure that the medium-wave thermal imager and the long-wave thermal imager work normally in a vacuum deep-cold environment, and facilitate the infrared radiation characteristic acquisition system to collect the working parameters of the medium-wave thermal imager and the long-wave thermal imager in the vacuum deep-cold environment.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, a mounting hole is provided on the side wall of the container and a connecting plate is installed at the mounting hole, and a threading hole is provided on the connecting plate; a medium-wave wiring hole is provided on the medium-wave inner shell, and a long-wave wiring hole is provided on the long-wave inner shell; the power cord is a long-wave power cord and a medium-wave power cord, and the long-wave power cord is sealed and passes through the threading hole and the long-wave wiring hole in sequence, and the medium-wave power cord is sealed and passes through the threading hole and the medium-wave wiring hole in sequence.

[0011] A further beneficial effect of the above is that the long-wave power line and the medium-wave power line are sealed and passed through the container, the medium-wave inner shell and the long-wave inner shell in sequence, so that the power supply and signal connection can be completed while avoiding the power line from damaging the sealing of the container, the medium-wave inner shell and the long-wave inner shell, thereby preventing the liquid nitrogen in the container from flowing out.

[0012] Furthermore, the connecting plate is provided with a pipe penetration hole, the medium-wave inner shell is provided with a nitrogen passage hole, and the air pipe is sealed and passes through the pipe penetration hole and the nitrogen passage hole in sequence.

[0013] A further beneficial effect of the above is that the air pipe is used to seal and pass through the pipe hole and the nitrogen hole in sequence, so that the nitrogen in the nitrogen tank can be continuously passed into the medium-wave inner shell to ensure the normal operation of the medium-wave thermal imager, and the sealing performance of the container and the medium-wave inner shell can be improved to avoid the loss of liquid nitrogen in the container.

[0014] Furthermore, it also includes a medium-wave outer shell and a long-wave outer shell, both of which are located in the container, and the inner shell wall of the medium-wave outer shell is wrapped and fixed on the outer shell wall of the medium-wave inner shell; the inner shell wall of the long-wave outer shell is wrapped and fixed on the outer side wall of the long-wave inner shell.

[0015] Furthermore, it also includes a pitching platform, which is placed in the container; the medium wave housing is fixed on the pitching platform.

[0016] A further beneficial effect of the above is that by adjusting the pitch angle of the medium wave housing using the pitch platform, the medium wave thermal imager can avoid the light spot on the medium wave glass, thereby improving the imaging effect of the medium wave thermal imager.

[0017] Furthermore, the pitch platform includes a fixed plate, a pitch plate, a first connecting rod, a screw motor, a moving block and a second connecting rod, all of which are located in the container, the bottom surface of the fixed plate is fixed to the inner bottom surface of the container; the pitch plate is located above the fixed plate; the bottom end of the first connecting rod is hinged to the fixed plate and the top end thereof is connected to the pitch plate; the screw motor is placed between the fixed plate and the pitch plate and its screw is arranged parallel to the fixed plate; the moving block is provided with threaded holes passing through both ends and is threadedly connected to the screw; the top end of the second connecting rod is connected to the pitch plate and the bottom end thereof is hinged to the moving block; the medium wave housing is fixed to the pitch plate.

[0018] Furthermore, it also includes a medium-wave heating wire and a long-wave heating wire. The medium-wave heating wire is located in the medium-wave outer shell and is wound around the outer peripheral wall of the medium-wave inner shell; the long-wave heating wire is located in the long-wave outer shell and is wound around the outer peripheral wall of the long-wave inner shell.

[0019] Furthermore, it also includes a medium-wave temperature sensor, a long-wave temperature sensor and a controller, wherein the medium-wave temperature sensor is located in the medium-wave outer shell and fixed on the outer peripheral shell wall of the medium-wave inner shell; the long-wave temperature sensor is located in the long-wave outer shell and fixed on the outer peripheral shell wall of the long-wave inner shell; and the controller is electrically connected to the pitch platform, the medium-wave heating wire, the long-wave heating wire, the medium-wave temperature sensor and the long-wave temperature sensor respectively.

[0020] The above further beneficial effect is: firstly, the medium-wave heating wire and the long-wave heating wire are used to heat the temperature of the medium-wave inner shell and the long-wave inner shell in real time; then, the medium-wave temperature sensor and the long-wave temperature sensor are used to monitor the temperature of the medium-wave inner shell and the long-wave inner shell in real time, so as to always provide a suitable working temperature for the medium-wave thermal imager and the long-wave thermal imager.

[0021] In addition, a method for measuring infrared radiation characteristics is provided, and the specific steps are as follows:

[0022] S1. Adjust the elevation platform to ensure that the cold reflection at the medium wave glass moves above the line of sight without blocking the target;

[0023] S2, start the power supply, set the target temperature through the controller, and display the current temperature of the medium-wave inner shell and the long-wave inner shell in real time through the long-wave temperature sensor and the medium-wave temperature sensor;

[0024] S3. Start the medium-wave thermal imager and the long-wave thermal imager, wait for the camera to be in a stable working state, and then start the infrared radiation characteristic acquisition system to ensure that the camera can capture the infrared brightness image and temperature field distribution of the target through the medium-wave glass or the long-wave glass;

[0025] S4. When liquid nitrogen is introduced into the vacuum container, the controller heating button is activated, and at the same time, the nitrogen tank is opened, and nitrogen is introduced into the medium-wave inner shell through the air pipe to exhaust the air and cool the medium-wave thermal imager;

[0026] S5. After data collection is completed, turn off the infrared radiation characteristic acquisition system and liquid nitrogen generator, wait for the pressure and temperature of the cabin environment to be consistent with the atmospheric environment, then turn off the controller and the test is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an infrared radiation characteristic measurement system of the present invention;

[0028] Figure 2 It is a structural schematic diagram of a medium-wave thermal imager in an infrared radiation characteristic measurement system of the present invention being blocked by a light spot on a medium-wave glass;

[0029] Figure 3 The present invention is a schematic structural diagram of a medium wave thermal imager in an infrared radiation characteristic measurement system for eliminating light spots on medium wave glass.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1. Container, 2. Medium-wave inner shell, 3. Long-wave inner shell, 4. Medium-wave glass, 5. Long-wave glass, 6. Nitrogen tank, 7. Infrared radiation characteristic acquisition system, 8. Connecting plate, 9. Pitch platform, 91. Fixed plate, 92. Pitch plate, 93. First connecting rod, 94. Screw motor, 95. Moving block, 96. Second connecting rod, 10. Medium-wave heating wire, 11. Long-wave heating wire, 12. Medium-wave temperature sensor, 13. Long-wave temperature sensor, 14. Controller, 15. Medium-wave thermal imager, 16. Long-wave thermal imager. DETAILED DESCRIPTION

[0032] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0033] like Figure 1 As shown, an infrared radiation characteristic measurement system is suitable for a vacuum cryogenic environment, comprising: a container 1, a medium-wave inner shell 2, a long-wave inner shell 3, a medium-wave glass 4, a long-wave glass 5, a nitrogen tank 6 and an infrared radiation characteristic acquisition system 7,

[0034] The inlet of the container 1 is connected with the outlet of the liquid nitrogen generator to simulate a vacuum deep cold environment in the container 1; the medium-wave inner shell 2 and the long-wave inner shell 3 are both placed in the container 1, a medium-wave thermal imager 15 is fixed in the medium-wave inner shell 2, and a long-wave thermal imager 16 is fixed in the long-wave inner shell 3; a medium-wave window is provided at the transmitting end of the medium-wave thermal imager 15 in the medium-wave inner shell 2; the medium-wave glass 4 is sealed at the medium-wave window; a long-wave window is provided at the transmitting end of the long-wave thermal imager 16 in the long-wave inner shell 3; the long-wave glass 5 is sealed at the long-wave window; the nitrogen tank 6 and the infrared radiation characteristic acquisition system 7 are both located outside the container 1, and the nitrogen tank 6 is connected with the medium-wave inner shell 2 through an air pipe; the infrared radiation characteristic acquisition system 7 is electrically connected with the medium-wave thermal imager 15 and the long-wave thermal imager 16 respectively through power lines.

[0035] like Figure 1 As shown, in some specific embodiments, the side wall of the container 1 can be provided with a mounting hole and a connecting plate 8 is installed at the mounting hole, and the connecting plate 8 is provided with a threading hole; the medium-wave inner shell 2 is provided with a medium-wave wiring hole, and the long-wave inner shell 3 is provided with a long-wave wiring hole; the power cords are long-wave power cords and medium-wave power cords, the long-wave power cord is sealed and passed through the threading hole and the long-wave wiring hole in turn, and the medium-wave power cord is sealed and passed through the threading hole and the medium-wave wiring hole in turn.

[0036] like Figure 1 As shown, in some specific embodiments, the connecting plate 8 may be provided with a pipe penetration hole, the medium-wave inner shell 2 may be provided with a nitrogen penetration hole, and the air pipe is sealed and passes through the pipe penetration hole and the nitrogen penetration hole in sequence.

[0037] like Figure 1 As shown, in some specific embodiments, a medium-wave outer shell and a long-wave outer shell may also be included. Both the medium-wave outer shell and the long-wave outer shell are located in the container 1. The inner peripheral shell wall of the medium-wave outer shell is wrapped and fixed on the outer peripheral shell wall of the medium-wave inner shell 2; the inner peripheral shell wall of the long-wave outer shell is wrapped and fixed on the outer peripheral side wall of the long-wave inner shell 3.

[0038] like Figure 2 and Figure 3 As shown, in some specific embodiments, a pitching platform 9 is also included, and the pitching platform 9 is placed in the container 1; the medium wave housing is fixed on the pitching platform 9.

[0039] like Figure 2 and Figure 3As shown, in some specific embodiments, the pitch platform 9 may include a fixed plate 91, a pitch plate 92, a first connecting rod 93, a screw motor 94, a moving block 95 and a second connecting rod 96, all of which are located in the container 1. The bottom surface of the fixed plate 91 is fixed to the inner bottom surface of the container 1; the pitch plate 92 is located above the fixed plate 91; the bottom end of the first connecting rod 93 is hinged on the fixed plate 91 and its top end is connected to the pitch plate 92; the screw motor 94 is placed between the fixed plate 91 and the pitch plate 92 and its lead screw is arranged parallel to the fixed plate 91; the moving block 95 is provided with threaded holes running through both ends and is threadedly connected to the lead screw; the top end of the second connecting rod 96 is connected to the pitch plate 92 and its bottom end is hinged to the moving block 95; the medium wave housing is fixed on the pitch plate 92.

[0040] like Figure 1 As shown, in some specific embodiments, a medium-wave heating wire 10 and a long-wave heating wire 11 may also be included. The medium-wave heating wire 10 is located in the medium-wave outer shell and is wound around the outer shell wall of the medium-wave inner shell 2; the long-wave heating wire 11 is located in the long-wave outer shell and is wound around the outer shell wall of the long-wave inner shell 3.

[0041] like Figure 1 As shown, in some specific embodiments, a medium-wave temperature sensor 12, a long-wave temperature sensor 13 and a controller 14 are also included. The medium-wave temperature sensor 12 is located in the medium-wave outer shell and fixed on the outer peripheral shell wall of the medium-wave inner shell 2; the long-wave temperature sensor 13 is located in the long-wave outer shell and fixed on the outer peripheral shell wall of the long-wave inner shell 3; the controller 14 is electrically connected to the pitch platform 9, the medium-wave heating wire 10, the long-wave heating wire 11, the medium-wave temperature sensor 12 and the long-wave temperature sensor 13 respectively.

[0042] In addition, a method for measuring infrared radiation characteristics is provided, and the specific steps are as follows:

[0043] S1. Adjust the pitch platform 9 to ensure that the cold reflection at the medium wave glass 4 moves to the top of the line of sight without blocking the target;

[0044] S2, start the power supply, set the target temperature through the controller 14, and display the current temperature of the medium-wave inner shell 2 and the long-wave inner shell 3 in real time through the long-wave temperature sensor 13 and the medium-wave temperature sensor 12;

[0045] S3, start the medium-wave thermal imager 15 and the long-wave thermal imager 16, wait for the camera to be in a stable working state, start the infrared radiation characteristic acquisition system 7, and ensure that the camera can capture the infrared brightness image and temperature field distribution of the target through the medium-wave glass 4 or the long-wave glass 5;

[0046] S4, when liquid nitrogen is introduced into the vacuum container 1, the heating button of the controller 14 is started, and the nitrogen tank 6 is opened at the same time, and nitrogen is introduced into the medium-wave inner shell 2 through the air pipe to exhaust air and cool the medium-wave thermal imager;

[0047] S5. After the data collection is completed, turn off the infrared radiation characteristic collection system 7 and the liquid nitrogen generator, wait for the pressure and temperature of the cabin environment to be consistent with the atmospheric environment, then turn off the controller 14 and the test is completed.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An infrared radiation characteristic measurement system suitable for a vacuum cryogenic environment, characterized in that: include: A container (1), wherein an inlet of the container (1) is connected to an outlet of a liquid nitrogen generator so as to simulate a vacuum cryogenic environment in the container (1); A medium-wave inner shell (2) and a long-wave inner shell (3), wherein the medium-wave inner shell (2) and the long-wave inner shell (3) are both placed in the container (1), a medium-wave thermal imager (15) is fixed in the medium-wave inner shell (2), and a long-wave thermal imager (16) is fixed in the long-wave inner shell (3); Medium-wave glass (4) and long-wave glass (5), the medium-wave inner shell (2) is provided with a medium-wave window hole corresponding to the emission end of the medium-wave thermal imager (15); the medium-wave glass (4) is sealed at the medium-wave window hole; the long-wave inner shell (3) is provided with a long-wave window hole corresponding to the emission end of the long-wave thermal imager (16); the long-wave glass (5) is sealed at the long-wave window hole; A nitrogen tank (6) and an infrared radiation characteristics acquisition system (7), wherein the nitrogen tank (6) and the infrared radiation characteristics acquisition system (7) are both located outside the container (1), and the nitrogen tank (6) is connected to the medium-wave inner shell (2) via an air pipe; and the infrared radiation characteristics acquisition system (7) is electrically connected to the medium-wave thermal imager (15) and the long-wave thermal imager (16) via power lines.

2. The infrared radiation characteristic measurement system according to claim 1, characterized in that: The side wall of the container (1) is provided with a mounting hole and a connection plate (8) is installed at the mounting hole, and the connection plate (8) is provided with a threading hole; the medium-wave inner shell (2) is provided with a medium-wave connection hole, and the long-wave inner shell (3) is provided with a long-wave connection hole; the power lines are long-wave power lines and medium-wave power lines, and the long-wave power lines are sealed and passed through the threading holes and the long-wave connection holes in sequence, and the medium-wave power lines are sealed and passed through the threading holes and the medium-wave connection holes in sequence.

3. The infrared radiation characteristic measurement system according to claim 1, characterized in that: The connecting plate (8) is provided with a pipe penetration hole, the medium wave inner shell (2) is provided with a nitrogen passage hole, and the air pipe is sealed and passes through the pipe penetration hole and the nitrogen passage hole in sequence.

4. The infrared radiation characteristic measurement system according to claim 1, characterized in that: It also comprises a medium-wave outer shell and a long-wave outer shell, wherein the medium-wave outer shell and the long-wave outer shell are both located in the container (1), and the inner peripheral shell wall of the medium-wave outer shell is wrapped and fixed on the outer peripheral shell wall of the medium-wave inner shell (2); the inner peripheral shell wall of the long-wave outer shell is wrapped and fixed on the outer peripheral side wall of the long-wave inner shell (3).

5. The infrared radiation characteristic measurement system according to claim 4, characterized in that: It also comprises a pitching platform (9), wherein the pitching platform (9) is placed in the container (1); and the medium wave housing is fixed on the pitching platform (9).

6. The infrared radiation characteristic measurement system according to claim 5, characterized in that: The pitching platform (9) comprises a fixed plate (91), a pitching plate (92), a first connecting rod (93), a screw motor (94), a moving block (95) and a second connecting rod (96), all of which are located in the container (1). The bottom surface of the fixed plate (91) is fixed to the inner bottom surface of the container (1); the pitching plate (92) is located above the fixed plate (91); the bottom end of the first connecting rod (93) is hinged on the fixed plate (91) and the top end thereof is connected to the pitching plate (92); the screw motor (94) is placed between the fixed plate (91) and the pitching plate (92) and the screw rod thereof is arranged parallel to the fixed plate (91); the moving block (95) is provided with threaded holes passing through both ends and is threadedly connected to the screw rod; the top end of the second connecting rod (96) is connected to the pitching plate (92) and the bottom end thereof is hinged to the moving block (95); the medium wave housing is fixed to the pitching plate (92).

7. The infrared radiation characteristic measurement system according to claim 5, characterized in that: It also comprises a medium-wave heating wire (10) and a long-wave heating wire (11), wherein the medium-wave heating wire (10) is located in the medium-wave outer shell and is wound around the outer peripheral wall of the medium-wave inner shell (2); and the long-wave heating wire (11) is located in the long-wave outer shell and is wound around the outer peripheral wall of the long-wave inner shell (3).

8. The infrared radiation characteristic measurement system according to claim 7, characterized in that: It also includes a medium-wave temperature sensor (12), a long-wave temperature sensor (13) and a controller (14); the medium-wave temperature sensor (12) is located in the medium-wave outer shell and fixed on the outer peripheral shell wall of the medium-wave inner shell (2); the long-wave temperature sensor (13) is located in the long-wave outer shell and fixed on the outer peripheral shell wall of the long-wave inner shell (3); and the controller (14) is electrically connected to the pitch platform (9), the medium-wave heating wire (10), the long-wave heating wire (11), the medium-wave temperature sensor (12) and the long-wave temperature sensor (13), respectively.

9. A method for measuring infrared radiation characteristics, characterized in that: The infrared radiation characteristic measurement system according to any one of claims 1 to 8 is provided, wherein the specific steps are as follows: S1, start the medium-wave thermal imager (15) and the long-wave thermal imager (16), wait for the camera to be in a stable working state, start the infrared radiation characteristic acquisition system (7), and ensure that the camera can capture the infrared brightness image and temperature field distribution of the target through the medium-wave glass (4) or the long-wave glass (5); S2. When liquid nitrogen is introduced into the vacuum container (1), the nitrogen tank (6) is opened, and nitrogen is introduced into the medium-wave inner shell (2) through the air pipe to exhaust air and cool the medium-wave thermal imager (15).

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