Autonomous anti-pollution type weak target detection focal plane assembly

Abstract

The invention relates to an autonomous anti-pollution type weak target detection focal plane assembly, and solves the technical problem that in the prior art, the refrigeration, heating annealing and anti-pollution requirements of a focal plane assembly cannot be met. The device comprises an intelligent temperature measurement and control device and a packaging box body. A refrigerator, a heat conduction plate and a detector assembly are arranged in the packaging box body. The packaging box body is provided with an adsorption cold trap, and the adsorption cold trap is sleeved with a heat insulation assembly. The heat insulation assembly is of an n-shaped structure. The adsorption cold trap forms a first temperature area, the refrigerator, the heat conducting plate and the detector assembly form a second temperature area, the packaging box body forms a third temperature area, and the optical-mechanical structure connecting plate forms a fourth temperature area; the temperatures of the first temperature zone, the second temperature zone, the third temperature zone and the fourth temperature zone are gradually increased in sequence; heat insulation is realized between the fourth temperature zone and the first temperature zone through a heat insulation assembly; and the adsorption cold trap is connected with an external heat sink.

Description

Technical Field

[0001] The invention relates to a space observation instrument, in particular to an autonomous anti-pollution weak target detection focal plane component. Background Art

[0002] Since the signal energy of faint space targets is weak, in order to observe faint space targets clearly and accurately, the observation instrument needs to have large aperture, high resolution, high stability, high sensitivity, and low noise observation performance. With the research and development needs in the field of faint space target observation such as space astronomical observation, space debris detection, and space situational awareness, the requirements for observing faint space targets are getting higher and higher, and therefore the requirements for focal plane detectors are also getting higher and higher.

[0003] In order to suppress the dark current thermal noise of the focal plane detector, it is usually necessary to cool the focal plane detector and consider the heating annealing requirements caused by repairing radiation damage; at the same time, as a weak target observation payload, the detector components in the focal plane detector also have high anti-pollution requirements.

[0004] As the technology of focal plane detectors has advanced, the structure of their detector components has also improved. Figure 1 Shown is a schematic diagram of the back structure of an existing traditional detector (A) and a new detector (B). It can be seen that the new detector allows a smaller heat dissipation area (blue part), making it more difficult to obtain and dissipate heat, and has higher requirements for cooling.

[0005] In the prior art, Chinese patents CN107045251A and CN117440222A are designed for water vapor pollution, and two focal plane components are disclosed respectively; Chinese patent CN113639715A redesigns the focal plane component structure, reducing the pointing instability caused by platform jitter, thermal flutter, etc., while meeting the low-noise working cooling requirements of different types of CCDs in different working modes, as well as the heating annealing requirements caused by the detection of radiation damage caused by CCD repair. However, none of the above focal plane components have studied organic pollution, and gradually cannot meet higher anti-pollution requirements and cooling and heating annealing requirements; in addition, the above focal plane components cannot meet the cooling requirements of new detectors. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problem that the prior art cannot meet the requirements of focal plane component refrigeration, heating annealing and anti-pollution, and to provide an autonomous anti-pollution weak target detection focal plane component.

[0007] In order to achieve the above purpose, the technical solution provided by the present invention is as follows:

[0008] An autonomous anti-pollution weak target detection focal plane component, which is special in that:

[0009] It includes an intelligent temperature measurement and control device, a packaging base plate and a packaging upper cover arranged on the packaging base plate, wherein the packaging base plate and the packaging upper cover constitute a packaging box body; a light-through hole is opened on the upper surface of the packaging upper cover;

[0010] A refrigerator and an active heating circuit are arranged in the packaging box body, the lower surface of the refrigerator is in contact with the packaging bottom plate, and a heat conducting plate is arranged on the upper surface, and the heat conducting plate is mounted on the packaging bottom plate through a heat insulating support column;

[0011] A detector assembly is provided on the heat conducting plate, and the position of the detector assembly corresponds to the light-through hole;

[0012] An adsorption cold trap is coaxially arranged on the upper cover of the package, and a heat insulation component is sleeved on the adsorption cold trap, and a through hole corresponding to the light through hole is arranged inside the heat insulation component;

[0013] The heat insulation assembly includes a coaxially arranged primary heat insulation cylinder and a secondary heat insulation cylinder, a secondary heat insulation platform arranged at the lower end of the secondary heat insulation cylinder, and a primary heat insulation platform arranged at the lower end of the primary heat insulation cylinder; the primary heat insulation cylinder is located outside the secondary heat insulation cylinder, a distance is set between the two and the upper ends are connected to each other; the primary heat insulation platform is located above the secondary heat insulation platform and a distance is set between the two; the upper surface of the primary heat insulation platform constitutes an optical-mechanical installation surface for installing an optical-mechanical structure connection plate;

[0014] The internal cavity of the through hole of the adsorption cold trap constitutes the first temperature zone, the detector assembly, the heat conduction plate, the refrigerator and the packaging bottom plate constitute the second temperature zone, the interior of the packaging upper cover constitutes the third temperature zone, and the optical-mechanical structure connection plate constitutes the fourth temperature zone; the temperatures of the first temperature zone, the second temperature zone, the third temperature zone and the fourth temperature zone increase in sequence;

[0015] The first temperature zone and the third temperature zone, and the first temperature zone and the fourth temperature zone are insulated by the insulation components, and the insulation effect can be ensured through a long heat transmission distance; the adsorption cold trap is connected to the external heat sink;

[0016] Temperature sensors are arranged on the heat conducting plate, the packaging bottom plate and the packaging box body; the temperature sensor, the refrigerator and the active heating circuit are all electrically connected to the intelligent temperature measuring and controlling device.

[0017] Furthermore, the top surface of the primary heat insulation platform abuts against the bottom surface of the optical-mechanical structure connection plate;

[0018] A cold trap ring plate is provided at the lower end of the adsorption cold trap;

[0019] The inner hole of the secondary thermal insulation platform is a stepped hole; the stepped surface of the secondary thermal insulation platform constitutes a cold trap installation surface for contacting and installing with the upper surface of the cold trap ring plate; the bottom surface of the secondary thermal insulation platform constitutes a box body installation surface for contacting and installing with the top surface of the packaging cover.

[0020] Furthermore, a first-level annular sealing groove is provided on the top surface of the first-level heat insulation platform for sealing between the optical-mechanical mounting surface and the optical-mechanical structure connecting plate;

[0021] A secondary annular sealing groove is provided on the bottom surface of the secondary heat insulation platform for sealing between the mounting surface of the box body and the packaging upper cover.

[0022] Further, the detector assembly includes a detector, a detector support frame, and a circuit board disposed on the heat conducting plate;

[0023] The detector support frame is installed on the circuit board through a heat-insulating support pad, the detector is embedded in the detector support frame and electrically connected to the circuit board; the detector corresponds to the position of the light-through hole.

[0024] Furthermore, a heat-conducting through hole corresponding to the position of the detector is provided on the circuit board;

[0025] Two circuit board contact bosses are respectively arranged on both sides of the upper surface of the heat conducting plate, and a detector contact boss is arranged at a position corresponding to the detector; the circuit board contact boss abuts against the circuit board; the detector contact boss passes through the heat conducting through hole and abuts against the detector.

[0026] Furthermore, a heat-conducting boss is provided on the upper surface of the packaging bottom plate, and the refrigerator is arranged on the heat-conducting boss; the heat-conducting boss is close to the hot end of the refrigerator, and the heat-conducting plate is close to the cold end of the refrigerator;

[0027] The active heating loop is arranged on the packaging bottom plate and is located between the heat-conducting boss and the side wall of the packaging upper cover.

[0028] Furthermore, a cable lead-out groove is provided on the outer side wall of the package cover, and the wiring terminals of the circuit board are led out of the package box body and connected to the external circuit through the cable lead-out groove using a flexible cable; the temperature sensor, the refrigerator and the active heating circuit are led out of the package box body and connected to the intelligent temperature measurement and control device through the cable lead-out groove using a flexible cable.

[0029] Furthermore, an annular mounting groove is provided on the upper surface of the package bottom plate, and an annular mounting boss is correspondingly provided at the lower end of the package upper cover, so as to achieve sealing between the package upper cover and the package bottom plate; the package upper cover is made of a common low thermal conductivity material;

[0030] An optomechanical structure mounting platform is provided on the outer periphery of the upper end of the packaging upper cover, which is used to fix the optomechanical structure connecting plate through a columnar heat-insulating connecting pad.

[0031] Furthermore, the outer surface of the adsorption cold trap is gold-plated to reduce the radiation heat exchange between the adsorption cold trap and the external environment, and the inner surface is blackened to avoid introducing stray light into the detector assembly;

[0032] The inner surface of the packaging box is gold-plated to reduce the radiation heat exchange between the second temperature zone and the third temperature zone;

[0033] The heat conducting plate is fixedly connected to the detector assembly through a heat conducting insulating pad, and is fixedly connected to the refrigerator through a heat conducting insulating pad; the refrigerator is fixedly connected to the packaging bottom plate through brazing or gluing.

[0034] Furthermore, the heat insulation component is made of titanium alloy, fiberglass or polyimide material and is integrally formed;

[0035] The heat conducting plate is a molybdenum plate, or other materials with high thermal conductivity and matching the thermal expansion coefficient of the material of the detector assembly; the cooler is a TEC cooler, which adopts PID control;

[0036] The temperature difference between the first temperature zone and the second temperature zone is greater than 10° to ensure the pollutant adsorption capacity of the cold trap.

[0037] The beneficial effects of the present invention compared with the prior art are as follows:

[0038] 1. The present invention provides an autonomous anti-pollution weak target detection focal plane assembly, in which an adsorption cold trap is designed right in front of the detector assembly. The adsorption cold trap maintains a temperature level 10°C lower than that of the detector assembly by connecting to a heat sink with a lower temperature. Through the principle of low-temperature capture, pollutants are adsorbed on the surface of the adsorption cold trap, thereby preventing the detector from being contaminated. On this basis, the thermal insulation of the adsorption cold trap and the detector assembly is studied, and an "X"-shaped thermal insulation assembly is designed, which is integrally formed using a low thermal conductivity thermal insulation material, thereby maximizing the heat transfer path between the adsorption cold trap and the optomechanical structure and the packaging box, thereby meeting the low-temperature conditions of the adsorption cold trap.

[0039] 2. The present invention provides an autonomous anti-pollution weak target detection focal plane assembly, which aims at the use requirements of low noise, radiation damage repair and anti-pollution of space weak target detectors. Under the premise of optimizing thermal insulation design and resource consumption, the detector assembly is actively cooled or heated through TEC, thereby achieving low-noise precision control of the focal plane assembly, and can meet the cooling and annealing requirements of different types of detector assemblies. The detector has high temperature control accuracy and good temperature stability.

[0040] 3. The present invention provides an autonomous anti-pollution weak target detection focal plane assembly. Aiming at the detector with a very small heat dissipation surface on the back, the cold end of the refrigerator is redesigned, the heat conduction plate is directly connected to the detector, and the detector and PCB are cooled simultaneously to expand the heat dissipation area, thereby smoothly transferring the heat consumption and parasitic heat leakage of the detector assembly to the TEC, so as to achieve a better cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the back structure of an existing detector, where A is a traditional detector, B is a new detector, and the blue part is the area where heat dissipation is allowed;

[0042] Figure 2 It is a structural schematic diagram of an embodiment of an autonomous anti-pollution weak target detection focal plane assembly of the present invention (the intelligent temperature measurement and control device is omitted);

[0043] Figure 3 is a cross-sectional view of an embodiment of the present invention;

[0044] Figure 4 is a schematic diagram of the installation of the detector assembly and the packaging base plate in an embodiment of the present invention;

[0045] Figure 5 is a cross-sectional view of a thermal insulation assembly according to an embodiment of the present invention;

[0046] Figure 6 is a schematic diagram of the three-dimensional structure of a heat conducting plate in an embodiment of the present invention;

[0047] Figure 7 is a temperature distribution diagram of an embodiment of the present invention, wherein dark blue, blue and light blue represent the first temperature zone, the second temperature zone and the third temperature zone respectively.

[0048] Figure Number:

[0049] 01- Optical-mechanical structure connection plate;

[0050] 1-adsorption cold trap, 11-cold trap ring plate; 2-thermal insulation assembly, 21-primary thermal insulation cylinder, 22-secondary thermal insulation cylinder, 23-primary thermal insulation platform, 24-secondary thermal insulation platform, 25-primary annular sealing groove, 26-secondary annular sealing groove;

[0051] 3-detector assembly, 31-detector, 32-detector support frame, 33-circuit board; 4-heat conducting plate, 41-circuit board contact boss, 42-detector contact boss; 5-refrigerator;

[0052] 6-packaging bottom plate, 61-heat-conducting boss, 62-annular mounting groove; 7-packaging upper cover, 71-cable lead-out groove, 72-optical-mechanical structure mounting platform; 8-active heating circuit; 9-intelligent temperature measurement and control device. DETAILED DESCRIPTION

[0053] The specific technical solutions in the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0054] Figure 2-Figure 4 An autonomous anti-pollution weak target detection focal plane assembly provided in an embodiment of the present invention is mainly composed of an adsorption cold trap 1 for anti-pollution and a matching insulation assembly 2, a detector assembly 3 for detection, a refrigerator 5 for heat dissipation and temperature control and a matching heat conduction plate 4 and an active heating circuit 8, and a packaging box.

[0055] Specifically, it includes an intelligent temperature measurement and control device 9, a packaging base plate 6, and a packaging upper cover 7 arranged on the packaging base plate 6. The packaging base plate 6 and the packaging upper cover 7 constitute a packaging box body; the upper surface of the packaging base plate 6 is provided with an annular mounting groove 62, and the lower end of the packaging upper cover 7 is correspondingly provided with an annular mounting boss; the upper end periphery of the packaging upper cover 7 is provided with an optical-mechanical structure mounting platform 72, which is used to cooperate with the heat-insulating connection pad to fix the optical-mechanical structure connecting plate 01. The upper surface of the packaging upper cover 7 is provided with a light-through hole.

[0056] A refrigerator 5 and an active heating circuit 8 are provided in the packaging box body. The lower surface of the refrigerator 5 contacts the packaging bottom plate 6, and the upper surface is provided with a heat conducting plate 4, which is mounted on the packaging bottom plate 6 through a heat insulating support column to reduce stress concentration. A heat conducting boss 61 is provided on the upper surface of the packaging bottom plate 6, and the refrigerator 5 is arranged on the heat conducting boss 61; the heat conducting boss 61 is close to the hot end of the refrigerator 5, and the heat conducting plate 4 is close to the cold end of the refrigerator 5; the active heating circuit 8 is arranged on the packaging bottom plate 6, and is located between the heat conducting boss 61 and the side wall of the packaging upper cover 7.

[0057] A detector assembly 3 is provided on the heat conducting plate 4, and the detector assembly 3 includes a detector 31, a detector support frame 32 and a circuit board 33 arranged on the heat conducting plate 4; the detector support frame 32 is installed on the circuit board 33 through a heat insulating support pad, and the detector 31 is embedded in the detector support frame 32 and electrically connected to the circuit board 33; the detector 31 corresponds to the position of the light through hole.

[0058] The detector assembly 3 of a weak target often requires a cooling temperature lower than -50°C. Affected by the heat flow outside the space, if only passive cooling is used, the cooling demand of the detector assembly 3 cannot be met. In view of the fact that the TEC semiconductor thermoelectric cooling method has no moving parts and no vibration, it can achieve precise closed-loop temperature control of cooling and heating, and the thermoelectric device has a long life and high reliability. The refrigerator 5 uses a TEC refrigerator and controls the temperature through PID. At this time, the package base plate 6 acts as the substrate of the TEC refrigerator.

[0059] The circuit board 33 is provided with a heat-conducting through hole corresponding to the position of the detector 31. Figure 6 Two circuit board contact bosses 41 are respectively provided on both sides of the upper surface of the heat conducting plate 4, and a detector contact boss 42 is provided at a position corresponding to the detector 31; the circuit board contact boss 41 abuts against the circuit board 33; the detector contact boss 42 passes through the heat conducting through hole and abuts against the detector 31. Since the heat dissipation area allowed on the back of the detector 33 is too small, it is not conducive to the transfer of heat consumption. Therefore, the circuit board contact boss 41 and the detector contact boss 42 are designed to abut against the heating position of the circuit board 33 and the detector 31, thereby expanding the heat dissipation area. That is, by adopting the method of cooling the detector and the PCB at the same time, the heat consumption and parasitic heat leakage of the detector assembly 3 are smoothly transferred to the cold end of the refrigerator 5 to achieve a better cooling effect.

[0060] A cable lead-out groove 71 is provided on the outer wall of the packaging cover 7, and the connection terminals of the circuit board 33 are led out of the packaging box body and connected to the external circuit through the cable lead-out groove 71 using a flexible cable; the temperature sensor, the refrigerator 5 and the active heating circuit 8 are led out of the packaging box body and connected to the intelligent temperature measurement and control device 9 through the cable lead-out groove 71 using a flexible cable.

[0061] An adsorption cold trap 1 is coaxially arranged on the packaging upper cover 7. The adsorption cold trap 1 is located right in front of the detector assembly 3. A heat insulation assembly 2 is sleeved thereon, and a through hole corresponding to the light through hole is arranged inside the heat insulation assembly 2.

[0062] refer to Figure 5 The heat insulation component 2 is a two-level heat insulation structure in the shape of a letter "X". Since the adsorption cold trap 1 needs to maintain the lowest temperature level of the system for a long time, it needs to be heat-insulated with the optical-mechanical structure (embodied as the optical-mechanical structure connecting plate 01, the optical-mechanical structure is close to room temperature) and the packaging box. However, due to the sealing requirements, conventional heat insulation pads are difficult to meet the heat insulation requirements. Therefore, a heat insulation pad is designed. Figure 5 The structure is an “X”-shaped structure shown in the figure, and a heat-insulating material with low thermal conductivity is used. According to different installation precision requirements, titanium alloy, fiberglass or polyimide and other materials are selected for one-piece molding, which maximizes the heat transfer path between the adsorption cold trap 1 and the optical-mechanical structure and the packaging box.

[0063] The thermal insulation assembly 2 includes a coaxially arranged first-level thermal insulation tube 21 and a second-level thermal insulation tube 22, a second-level thermal insulation platform 24 is provided at the lower end of the second-level thermal insulation tube 22, and a first-level thermal insulation platform 23 is provided at the lower end of the first-level thermal insulation tube 21; the first-level thermal insulation tube 21 is located on the outside of the second-level thermal insulation tube 22, a distance is provided between the two and the upper ends are connected to each other; the first-level thermal insulation platform 23 is located above the second-level thermal insulation platform 24 and a distance is provided between the two; the upper surface of the first-level thermal insulation platform 23 constitutes an optomechanical mounting surface for mounting the optomechanical structure connecting plate 01; the top surface of the first-level thermal insulation platform 23 abuts against the bottom surface of the optomechanical structure connecting plate 01.

[0064] The lower end of the adsorption cold trap 1 is provided with a cold trap ring plate 11; the inner hole of the secondary heat insulation platform 24 is a stepped hole, the stepped surface of which abuts against the upper surface of the cold trap ring plate 11, and the bottom surface of the secondary heat insulation platform 24 abuts against the top surface of the package upper cover 7. The stepped surface of the secondary heat insulation platform 24 constitutes a cold trap mounting surface, which is used for contacting and mounting with the upper surface of the cold trap ring plate 11; the bottom surface of the secondary heat insulation platform 24 constitutes a box body mounting surface, which is used for contacting and mounting with the top surface of the package upper cover 7.

[0065] A primary annular sealing groove 25 is provided on the top surface of the primary insulation platform 23 for sealing between the optomechanical mounting surface and the optomechanical structure connecting plate 01 ; a secondary annular sealing groove 26 is provided on the bottom surface of the secondary insulation platform 24 for sealing between the box body mounting surface and the packaging upper cover 7 .

[0066] refer to Figure 7 The internal cavity of the through hole of the adsorption cold trap 1 constitutes the first temperature zone, the detector assembly 3, the heat conduction plate 4, the refrigerator 5 and the packaging bottom plate 6 constitute the second temperature zone, the internal cavity of the packaging cover 7 constitutes the third temperature zone, and the optomechanical structure connecting plate 01 constitutes the fourth temperature zone (i.e., the external environment); the temperatures of the first temperature zone, the second temperature zone, the third temperature zone, and the fourth temperature zone increase successively, and the fourth temperature zone is close to room temperature.

[0067] The first temperature zone and the third temperature zone, and the first temperature zone and the fourth temperature zone are insulated by the insulation component 2; the adsorption cold trap 1 is connected to the external heat sink, so that the temperature of the first temperature zone is lower than that of the second temperature zone. The adsorption cold trap 1 maintains a temperature level more than 10°C lower than that of the detector component 3 by connecting to a heat sink with a lower temperature. Through the principle of low-temperature capture, the contaminants are adsorbed on its own surface, thereby preventing the detector 31 from being contaminated.

[0068] The heat conducting plate 4, the packaging bottom plate 6 and the packaging box are all provided with temperature sensors; the temperature sensor, the refrigerator 5 and the active heating circuit 8 are all electrically connected to the intelligent temperature measurement and control device 9. The intelligent temperature measurement and control device 9 performs real-time closed-loop control on the refrigerator 5 according to the cold end and hot end temperatures of the refrigerator 5 and the cooling target temperature collected by the temperature sensor, and cooperates with the active heating circuit 8 to realize precise cooling and temperature control of the detector 31.

[0069] In the embodiment of the present invention, in order to reduce heat leakage, the outer surface of the adsorption cold trap 1 is gold-plated, and the inner surface is blackened; the inner surface of the packaging box is gold-plated.

[0070] The heat conducting plate 4 is fixedly connected to the detector assembly 3 through a heat conducting insulating pad, and is fixedly connected to the refrigerator 5 through a heat conducting insulating pad; the refrigerator 5 is fixedly connected to the packaging bottom plate 6 through brazing or gluing. The heat conducting plate 4 is a molybdenum plate.

[0071] The above content is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An autonomous anti-pollution weak target detection focal plane assembly, characterized in that: It comprises an intelligent temperature measurement and control device (9), a packaging base plate (6), and a packaging upper cover (7) arranged on the packaging base plate (6), wherein the packaging base plate (6) and the packaging upper cover (7) constitute a packaging box body; a light-through hole is provided on the upper surface of the packaging upper cover (7); A refrigerator (5) and an active heating circuit (8) are provided in the packaging box body; the lower surface of the refrigerator (5) is in contact with the packaging bottom plate (6); the upper surface of the refrigerator (5) is provided with a heat conducting plate (4); and the heat conducting plate (4) is mounted on the packaging bottom plate (6) via a heat insulating support column; The heat conducting plate (4) is provided with a detector assembly (3), and the position of the detector assembly (3) corresponds to the light-through hole; An adsorption cold trap (1) is coaxially arranged on the packaging upper cover (7), and a heat insulation component (2) is sleeved on the adsorption cold trap (1), and a through hole corresponding to the light through hole is arranged inside the heat insulation component (2); The thermal insulation assembly (2) comprises a coaxially arranged primary thermal insulation tube (21), a secondary thermal insulation tube (22), a secondary thermal insulation platform (24) arranged at the lower end of the secondary thermal insulation tube (22), and a primary thermal insulation platform (23) arranged at the lower end of the primary thermal insulation tube (21); the primary thermal insulation tube (21) is located outside the secondary thermal insulation tube (22), a spacing is provided between the two and the upper ends are connected to each other; the primary thermal insulation platform (23) is located above the secondary thermal insulation platform (24) and a spacing is provided between the two; the upper surface of the primary thermal insulation platform (23) constitutes an optical-mechanical mounting surface for mounting an optical-mechanical structure connecting plate (01); The adsorption cold trap (1) constitutes a first temperature zone, the detector assembly (3), the heat conducting plate (4), the refrigerator (5) and the packaging bottom plate (6) constitute a second temperature zone, the packaging upper cover (7) constitutes a third temperature zone, and the optical-mechanical structure connecting plate (01) constitutes a fourth temperature zone; the temperatures of the first temperature zone, the second temperature zone, the third temperature zone and the fourth temperature zone increase in sequence; The first temperature zone and the third temperature zone, and the first temperature zone and the fourth temperature zone are thermally insulated by the thermal insulation component (2); the adsorption cold trap (1) is connected to an external heat sink; The heat conducting plate (4), the packaging bottom plate (6) and the packaging box body are all provided with temperature sensors; the temperature sensor, the refrigerator (5) and the active heating circuit (8) are all electrically connected to the intelligent temperature measurement and control device (9).

2. The autonomous anti-pollution weak target detection focal plane assembly according to claim 1, characterized in that: The top surface of the primary heat insulation platform (23) abuts against the bottom surface of the optical-mechanical structure connecting plate (01); A cold trap ring plate (11) is provided at the lower end of the adsorption cold trap (1); The inner hole of the secondary heat insulation platform (24) is a stepped hole; The step surface of the secondary heat insulation platform (24) constitutes a cold trap installation surface, which is used for contact installation with the upper surface of the cold trap ring plate (11); the bottom surface of the secondary heat insulation platform (24) constitutes a box body installation surface, which is used for contact installation with the top surface of the packaging upper cover (7).

3. The autonomous anti-pollution weak target detection focal plane assembly according to claim 2, characterized in that: A primary annular sealing groove (25) is provided on the top surface of the primary heat insulation platform (23) for sealing between the optical-mechanical mounting surface and the optical-mechanical structure connecting plate (01); The bottom surface of the secondary heat insulation platform (24) is provided with a secondary annular sealing groove (26) for sealing between the box body mounting surface and the packaging upper cover (7).

4. The autonomous anti-pollution weak target detection focal plane assembly according to claim 3, characterized in that: The detector assembly (3) comprises a detector (31), a detector support frame (32), and a circuit board (33) arranged on the heat conducting plate (4); The detector support frame (32) is mounted on the circuit board (33) via a heat-insulating support pad; the detector (31) is embedded in the detector support frame (32) and is electrically connected to the circuit board (33); the detector (31) corresponds to the position of the light-through hole.

5. The autonomous anti-pollution weak target detection focal plane assembly according to claim 4, characterized in that: The circuit board (33) is provided with a heat-conducting through hole corresponding to the position of the detector (31); Two circuit board contact bosses (41) are respectively provided on both sides of the upper surface of the heat conducting plate (4), and a detector contact boss (42) is provided at a position corresponding to the detector (31); the circuit board contact boss (41) abuts against the circuit board (33); and the detector contact boss (42) passes through the heat conducting through hole and abuts against the detector (31).

6. The autonomous anti-pollution weak target detection focal plane assembly according to claim 5, characterized in that: The upper surface of the packaging bottom plate (6) is provided with a heat-conducting boss (61), and the refrigerator (5) is arranged on the heat-conducting boss (61); the heat-conducting boss (61) is in close contact with the hot end of the refrigerator (5), and the heat-conducting plate (4) is in close contact with the cold end of the refrigerator (5); The active heating circuit (8) is arranged on the packaging bottom plate (6) and is located between the heat-conducting boss (61) and the side wall of the packaging upper cover (7).

7. The autonomous anti-pollution weak target detection focal plane assembly according to claim 6, characterized in that: The outer wall of the packaging upper cover (7) is provided with a cable lead-out groove (71), and the wiring terminal of the circuit board (33) is led out of the packaging box body and connected to the external circuit through the cable lead-out groove (71) using a flexible cable; the temperature sensor, the refrigerator (5) and the active heating circuit (8) are led out of the packaging box body and connected to the intelligent temperature measurement and control device (9) through the cable lead-out groove (71) using a flexible cable.

8. The autonomous anti-pollution weak target detection focal plane assembly according to claim 7, characterized in that: The upper surface of the packaging bottom plate (6) is provided with an annular mounting groove (62), and the lower end of the packaging upper cover (7) is correspondingly provided with an annular mounting boss; An optomechanical structure mounting platform (72) is provided on the outer periphery of the upper end of the packaging upper cover (7) and is used to fix the optomechanical structure connecting plate (01) via a heat-insulating connecting pad.

9. The autonomous anti-pollution weak target detection focal plane assembly according to claim 1, characterized in that: The outer surface of the adsorption cold trap (1) is subjected to gold plating treatment, and the inner surface is subjected to blackening treatment; The inner surface of the packaging box body is gold-plated; The heat conducting plate (4) is fixedly connected to the detector assembly (3) via a heat conducting insulating pad, and is fixedly connected to the refrigerator (5) via a heat conducting insulating pad; the refrigerator (5) is fixedly connected to the packaging base plate (6) via brazing or gluing.

10. The autonomous anti-pollution weak target detection focal plane assembly according to claim 1, characterized in that: The heat insulation component (2) is made of titanium alloy, glass fiber reinforced plastic or polyimide material and is integrally formed; The heat conducting plate (4) is a molybdenum plate; The refrigerator (5) is a TEC refrigerator and adopts PID control; The temperature difference between the first temperature zone and the second temperature zone is greater than 10°.

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