A pollution prevention device for cold optical systems of space infrared instruments and its application method

Abstract

This invention provides an anti-contamination device and its application method for a cold optical system of a space infrared instrument. Room temperature optics operate at approximately 300K, while cold optical systems typically operate between 60K and 250K, exhibiting a significant temperature gradient. This invention connects the room temperature window assembly and the low temperature window assembly of the space infrared cold optical system using a high thermal resistance non-metallic sealed cold trap. This prevents both from being affected by external temperature interference. The high thermal resistance non-metallic sealed cold trap physically isolates the cold optical components from the external room temperature environment, effectively preventing the entry of external water vapor and condensable volatiles. This avoids contamination of the room temperature window and the cold window near the cold trap end, preventing the volatilization of external organic materials and water vapor from contaminating the cold optical inlet and preventing instrument performance degradation. Simultaneously, a cold window heating element, adhesively fixed to the outer wall of the cold optical structure near the cold window assembly, effectively prevents low-temperature adsorption contamination at the cold window and removes small amounts of water vapor from the cold optical structure through heating.

Description

Technical Field

[0001] This invention relates to the technical field of aerospace, and in particular to an anti-contamination device for the cold optical structure of a space infrared instrument and its application method. Background Technology

[0002] With the development of high-sensitivity and high-quantitation technology in space infrared remote sensing, cryogenic cold optical structures are increasingly used in space infrared optical instruments, such as the (Fengyun-3) infrared hyperspectral atmospheric sounder and the (Fengyun-4) vertical sounder. Adopting cold optical design in infrared systems is a necessary means to reduce background noise and improve instrument sensitivity.

[0003] Cold optical structures typically require cooling to 60K-250K to operate. The surrounding instruments are in a normal temperature environment and contain various non-metallic materials, adhesives, conformal coatings, etc. These materials will release gas in a vacuum, and the effect will last for a long time. The temperature of the cold optical structure is usually more than 50 degrees Celsius lower than the surrounding environment. Due to the principle of low-temperature adsorption, the open cold optical window is affected by the surrounding organic pollutants and moisture. After the pollutants accumulate, they will cause the performance of some sensitive channels to degrade and reduce the performance of the instrument. In order to ensure that the performance of the instrument remains stable in the long term, it is necessary to implement a contamination prevention system for the cold optical structure.

[0004] A common decontamination system involves periodically heating and degassing the cold optical structures. For example, the CrIS (Transorbital Infrared Sounder) on the US polar-orbiting operational environmental satellite NPOESS uses a periodic heating method (lasting several months) annually. my country's HIRAS-I (Hyperspectral Infrared Atmospheric Sounder Type I) on the Fengyun-3D polar-orbiting meteorological satellite also uses a similar method for periodic heating and decontamination to restore instrument performance. The disadvantages of this method are that it requires periodically stopping the instrument's detection function for medium-temperature (30℃-40℃) heating and decontamination, which takes a long time and affects the instrument's on-orbit operational use. Furthermore, some organic pollutants cannot be removed by heating alone. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-contamination system for the cold optical structure of space infrared instruments that can effectively solve the problem of signal attenuation caused by external contamination of the cold optical structure, without requiring periodic on-orbit baking and thus affecting business applications.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A contamination prevention device for a cold optical system of a space infrared instrument is disclosed to prevent mutual temperature and contamination interference between a room-temperature optical structure and a cold optical structure. The device includes a room-temperature window pressure plate assembly, a high thermal resistance sealed cold trap, a cold window assembly, a cold window pressure plate assembly, and a room-temperature window assembly. The room-temperature window assembly is fixed to the outer ring of the opening of the room-temperature optical structure with screws. One end of the high thermal resistance sealed cold trap is connected to the outer ring of the opening of the room-temperature optical structure via the room-temperature window pressure plate assembly. The cold window assembly is fixed to the opening of the cold optical structure with screws. The other end of the high thermal resistance sealed cold trap is connected to the opening of the cold optical structure via the cold window pressure plate assembly. The high thermal resistance sealed cold trap connects the room-temperature optical structure and the cold optical structure, preventing heat leakage from the cold optical structure and thus avoiding mutual temperature interference between them.

[0008] Preferably, it also includes a cold window heating element, which is connected to a temperature control circuit or a temperature relay. The cold window heating element is fixed to the outer wall of the opening of the cold optical structure by adhesive and is close to the cold window assembly, so as to heat the cold optical structure as needed and prevent the cold window assembly from being contaminated by low-temperature adsorption.

[0009] Preferably, the room temperature window assembly includes a room temperature window shell and a room temperature window; the room temperature window shell has an inner cavity, and the room temperature window is made of infrared material and is fixedly installed in the inner cavity of the room temperature window shell by adhesive or pressure ring; both ends of the room temperature window shell are respectively provided with externally threaded room temperature window threaded sections for connection with the room temperature window pressure plate assembly; a connector for the high thermal resistance sealed cold trap is reserved between the room temperature window threaded section and the room temperature window shell; one end of the high thermal resistance sealed cold trap is fixedly pressed into the connector by the room temperature window pressure plate assembly and connected to the room temperature optical structure.

[0010] Preferably, the ambient temperature window pressure plate assembly includes an internally threaded pressure ring, a first threaded pressure ring back plate, and a second threaded pressure ring back plate; the first and second threaded pressure ring back plates are semi-pressure rings, which are fixed to both ends of the threaded pressure ring by countersunk screws, facilitating assembly and integration in a confined space; the internal thread of the threaded pressure ring is connected to the external thread of the ambient temperature window thread section; one end of the high thermal resistance enclosed cold trap passes through the annular threaded pressure ring, is fixed and pressed into the connector, and is connected to the ambient temperature optical structure.

[0011] Preferably, the cold window assembly includes a cold window shell and a cold window; the cold window has an inner cavity, and the cold window is fixed in the inner cavity of the cold window shell using a fluororubber pressure ring or a low-exhaust-rate epoxy resin adhesive; the cold window shell has cold window flanges at both ends, and the cold window flanges are connected to the other end of the high thermal resistance sealed cold trap by means of a cold window pressure plate assembly.

[0012] Preferably, the cold window pressure plate assembly includes a first cold window pressure ring and a second cold window pressure ring, both of which are half-circle pressure rings; the first cold window pressure ring and the second cold window pressure ring are respectively connected to the other end of the high thermal resistance closed cold trap and the cold window flange of the cold window assembly by countersunk screws.

[0013] Preferably, the high thermal resistance sealed cold trap is made of ultra-thin non-metallic material and is cylindrical or conical. The inner cavity of the high thermal resistance sealed cold trap is slightly larger than the light-transmitting aperture. The two ends of the high thermal resistance sealed cold trap are fixed and connected to the ambient temperature window pressure plate assembly and the cold window pressure plate assembly respectively by flanges.

[0014] Preferably, the high thermal resistance enclosed cold trap includes a conical surface and a corrugated surface. The conical surface is connected to the ambient temperature window pressure plate assembly via a flange face, and the corrugated surface is connected to the cold window assembly via a flange transition face. The corrugated structure of the corrugated surface increases the total length of the transmission path and increases the thermal resistance to reduce heat conduction leakage.

[0015] Preferably, the corrugated structure has vent holes on its side for releasing air when the air pressure decreases.

[0016] The present invention also provides a method for applying an anti-contamination device for a cold optical system of a space infrared instrument, comprising the following steps:

[0017] The two ends of the high thermal resistance sealed cold trap are connected to the room temperature window and the cold window respectively through flange face one and flange face two via threaded pressure ring back plate one and threaded pressure ring back plate two of the room temperature window pressure plate assembly and cold window pressure ring one and cold window pressure ring two of the cold window pressure plate assembly. This allows the cold optical structure and the room temperature optical structure to be physically isolated from the external room temperature environment through the high thermal resistance sealed cold trap, effectively preventing external water vapor and condensable volatiles from entering, thereby preventing external organic materials from volatilizing and water vapor from contaminating the cold optical inlet and preventing the instrument performance from degrading.

[0018] The cold window heating element is glued to the outer wall of the opening of the cold optical structure near the cold window assembly and connected to a temperature control circuit or temperature relay to provide heat energy. It is used to heat and remove a small amount of water vapor in the cold optical structure during the initial stage of spacecraft entering orbit. Once the spacecraft's condition stabilizes, there is no need to perform decontamination heating again. This solves the problem that spacecraft need to perform decontamination heating on-orbit periodically, which prevents continuous operation and affects business applications.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. By adopting a corrugated tube-type enclosed cold trap, compared to the method of setting only a low-temperature open cold trap along the infrared radiation path, which can only adsorb part of the contaminants, the cold optical window is physically isolated from the external environment, basically eliminating the influence of the outside world. This solves the problem that open cold traps cannot isolate all contaminants and cannot avoid the system performance degradation caused by the adsorption of contaminants by the cold optical structure.

[0021] 2. Usually, only decontamination and heating are required at the initial stage of instrument entry into orbit. Once the instrument is stable, decontamination and heating are no longer required. This solves the problem that the instrument needs to be decontaminated and heated in orbit periodically, which prevents it from working continuously and affects business applications. Attached Figure Description

[0022] Figure 1 A schematic diagram illustrating the application of an anti-contamination device for a cold optical system of a space infrared instrument in both room-temperature and cold optical structures, provided as an embodiment of the present invention.

[0023] Figure 2 for Figure 1 A partial sectional view of the structure;

[0024] Figure 3 for Figure 2 A magnified schematic diagram of the structure of I.

[0025] Figure 4 for Figure 2 A magnified structural diagram of section II;

[0026] Figure 5 A cross-sectional view of a room temperature window pressure plate assembly in an anti-pollution device for a cold optical system of a space infrared instrument, provided as an embodiment of the present invention;

[0027] Figure 6 This is a cross-sectional schematic diagram of a high thermal resistance enclosed cold trap in an anti-pollution device for a cold optical system of a space infrared instrument, provided as an embodiment of the present invention.

[0028] Figure 7 A cross-sectional view of a cold window assembly in an anti-pollution device for a cold optical system of a space infrared instrument, provided as an embodiment of the present invention;

[0029] Figure 8 A schematic diagram of the structure of a cold window heating element in an anti-pollution device for a cold optical system of a space infrared instrument, provided as an embodiment of the present invention;

[0030] Figure 9 A three-dimensional structural schematic diagram of a cold window pressure plate assembly in an anti-pollution device for a cold optical system of a space infrared instrument, provided as an embodiment of the present invention;

[0031] Figure 10 A cross-sectional view of a cold window pressure plate assembly in an anti-pollution device for a cold optical system of a space infrared instrument, provided as an embodiment of the present invention;

[0032] Figure 11 This is a cross-sectional view of a room-temperature window assembly in an anti-pollution device for a cold optical system of a space infrared instrument, provided as an embodiment of the present invention.

[0033] The serial numbers in the diagram are as follows:

[0034] 1. Room temperature window pressure plate assembly; 101. Threaded pressure ring; 102. Threaded pressure ring back plate; 103. Countersunk screw; 2. High thermal resistance enclosed cold trap; 201. Flange face one; 202. Inclined conical face; 203. Corrugated face; 204. Flange transition face; 205. Flange face two; 3. Cold window assembly; 301. Cold window flange; 302. Cold window; 4. Cold window heating element; 5. Cold window pressure plate assembly; 501. Cold window pressure ring one; 502. Cold window pressure ring two; 6. Room temperature window assembly; 601. Room temperature window shell; 602. Room temperature window; 603. Room temperature window threaded section; 7. Room temperature optical structure; 8. Cold optical structure. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] like Figures 1 to 10 As shown in this embodiment, an anti-contamination device for a cold optical system of a space infrared instrument is provided to prevent mutual temperature and contamination interference between the room temperature optical structure 7 and the cold optical structure 8. The device includes a room temperature window pressure plate assembly 1, a high thermal resistance sealed cold trap 2, a cold window assembly 3, a cold window heating element 4, a cold window pressure plate assembly 5, and a room temperature window assembly 6.

[0037] The ambient temperature window assembly 6 is fixed to the outer ring of the opening of the ambient temperature optical structure 7 by screws, and includes an ambient temperature window shell 601 and an ambient temperature window 602.

[0038] The room temperature window housing 601 has an inner cavity. The room temperature window 602 is made of infrared material and is fixed in the inner cavity of the room temperature window housing 601 by adhesive or pressure ring. The room temperature window housing 601 has external threaded sections 603 at both ends for connecting with the room temperature window pressure plate assembly 1. A high thermal resistance sealed cold trap 2 is reserved between the room temperature window threaded section 603 and the room temperature window housing 601. One end of the high thermal resistance sealed cold trap 2 is fixed and pressed into the connector by the room temperature window pressure plate assembly 1 and connected to the room temperature optical structure 7.

[0039] The ambient temperature window pressure plate assembly 1 includes a threaded pressure ring 101 with internal threads, a first threaded pressure ring back plate 102, and a second threaded pressure ring back plate 104. The first threaded pressure ring back plate 102 and the second threaded pressure ring back plate 104 are semi-pressure rings, which are fixed to both ends of the threaded pressure ring 101 by countersunk screws 103, facilitating assembly and integration in a confined space. The internal thread of the threaded pressure ring 101 is connected to the external thread of the ambient temperature window thread section 603. One end of the high thermal resistance sealed cold trap 2 passes through the annular threaded pressure ring 101, is fixed and pressed into the connector, and is connected to the ambient temperature optical structure 7.

[0040] The cold window assembly 3 is fixed to the opening of the cold optical structure 8 by screws, and includes a cold window shell 303 and a cold window 302. The cold window 302 is provided with an inner cavity, and the cold window 302 is fixed in the inner cavity of the cold window shell 303 by a fluororubber pressure ring or a low-exhaust epoxy resin adhesive. The cold window shell 303 is provided with cold window flanges 301 at both ends, and the cold window flanges 301 are connected to the other end of the high thermal resistance sealed cold trap 2 by the cold window pressure plate assembly 5, and the other end of the high thermal resistance sealed cold trap 2 is connected to the opening of the cold optical structure 8.

[0041] The cold window pressure plate assembly 5 includes a first cold window pressure ring 501 and a second cold window pressure ring 502, both of which are half-circle pressure rings. The other end of the high thermal resistance sealed cold trap 2 is connected to the cold window flange 301 of the cold window assembly 3 by countersunk screws.

[0042] Room temperature optics operate at around 300K, while cold optics typically operate between 60K and 250K, resulting in a significant temperature gradient. A high thermal resistance sealed cold trap 2 connects the room temperature optical structure 7 and the cold optical structure 8, preventing heat leakage from the cold optical structure 8 and thus protecting both structures from external temperature interference. The high thermal resistance sealed cold trap 2 effectively prevents external moisture and condensable volatiles from entering, thereby avoiding contamination of the room temperature window 602 and the cold window 302 near the high thermal resistance sealed cold trap 2.

[0043] The cold window heating element 4 is connected to a temperature control circuit or a temperature relay. The cold window heating element 4 is fixed to the outer wall of the opening of the cold optical structure 8 by adhesive and close to the cold window assembly 3. It is used to heat the cold optical structure 8 as needed to prevent the cold window 302 of the cold window assembly 3 from being contaminated by low temperature adsorption. It is also used to heat and remove a small amount of water vapor in the cold optical structure 8 during the initial stage of spacecraft orbit insertion.

[0044] Furthermore, in this embodiment, the high thermal resistance sealed cold trap 2 is made of ultra-thin non-metallic material and is cylindrical or conical. The inner cavity of the high thermal resistance sealed cold trap 2 is slightly larger than the light-transmitting aperture. The high thermal resistance sealed cold trap 2 includes an inclined conical surface 202 and a corrugated surface 203. The inclined conical surface 202 is connected to the ambient temperature window pressure plate assembly 1 through a flange surface 201, and the corrugated surface 203 is connected to the cold window assembly 3 through a flange transition surface 204. The corrugated structure of the corrugated surface 203 is used to increase the total length of the transmission path, while increasing the thermal resistance and reducing heat conduction leakage.

[0045] Furthermore, in this embodiment, the corrugated structure has a vent hole on its side, which is used to release air when the air pressure decreases.

[0046] Furthermore, in this embodiment, the high thermal resistance enclosed cold trap 2 is made of high thermal resistance, low outgassing rate epoxy fiber with a wall thickness of no more than 0.1 mm. The 0.1 mm wall thickness is used to significantly increase the structural thermal resistance. It is manufactured using processes such as molding and injection molding.

[0047] This invention provides a method for applying a contamination prevention device for a cold optical system of a space infrared instrument, the method being as follows:

[0048] The two ends of the high thermal resistance sealed cold trap 2 are connected to the ambient temperature window 602 and the cold window 302 via flange face 1 201 and flange face 205 respectively through the threaded pressure ring back plate 102 of the ambient temperature window pressure plate assembly 1 and the threaded pressure ring back plate 2 104, and the cold window pressure ring 1 501 and cold window pressure ring 2 502 of the cold window pressure plate assembly 5. This allows the cold optical structure 8 and the ambient temperature optical structure 7 to be physically isolated from the external ambient temperature environment through the high thermal resistance sealed cold trap 2, effectively preventing external water vapor and condensable volatiles from entering, thereby preventing the volatilization of external organic materials and water vapor from contaminating the cold optical inlet and preventing the instrument performance from degrading.

[0049] The cold window heating element 4 is glued to the outer wall of the opening of the cold optical structure 8 near the cold window assembly 3, and is connected to a temperature control circuit or temperature relay to provide heat energy. It is used to heat and remove a small amount of water vapor in the cold optical structure 8 during the initial stage of spacecraft entering orbit. Once the spacecraft is stable, there is no need to perform decontamination heating again, which solves the problem that spacecraft need to be decontaminated and heated on-orbit periodically, which prevents continuous operation and affects business applications.

[0050] This invention provides a contamination prevention device for the cold optical system of a space infrared instrument. By connecting the room-temperature window assembly and the low-temperature window assembly of the space infrared cold optical system with a high thermal resistance non-metallic sealed cold trap, this invention physically isolates the cold optical components from the external room-temperature environment, thereby preventing contamination of the cold optical inlet by the volatilization of external organic materials and moisture, and preventing instrument performance degradation. It also eliminates the need for a low-temperature window heating element, allowing for heating and decontamination of the cold optical window when necessary.

[0051] This invention connects the ambient temperature window assembly and the cryogenic window assembly of a space infrared cold optics system using a high thermal resistance non-metallic sealed cold trap. This physically isolates the cold optics from the external ambient temperature environment, preventing the volatilization of external organic materials and moisture from contaminating the cold optics inlet and thus preventing instrument performance degradation. It also eliminates the need for a cryogenic window heating element, allowing for heating and decontamination of the cold optics window when necessary.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An application method for an anti-contamination device used in a cold optical system of a space infrared instrument, characterized in that, The device is used to prevent mutual temperature and contamination interference between the room temperature optical structure (7) and the cold optical structure (8). It includes a room temperature window pressure plate assembly (1), a high thermal resistance closed cold trap (2), a cold window assembly (3), a cold window pressure plate assembly (5), and a room temperature window assembly (6). The ambient temperature window assembly (6) is fixed to the outer ring of the opening of the ambient temperature optical structure (7) by screws. The ambient temperature window assembly (6) connects one end of the high thermal resistance closed cold trap (2) to the outer ring of the opening of the ambient temperature optical structure (7) through the ambient temperature window pressure plate assembly (1). The cold window assembly (3) is fixed to the opening of the cold optical structure (8) by screws, and the other end of the high thermal resistance closed cold trap (2) is connected to the opening of the cold optical structure (8) by the cold window pressure plate assembly (5). The room temperature optical structure (7) and the cold optical structure (8) are connected by the high thermal resistance closed cold trap (2), so as to avoid heat leakage of the cold optical structure (8) and thus avoid mutual temperature interference between the room temperature optical structure (7) and the cold optical structure (8). The room temperature window assembly (6) includes a room temperature window shell (601) and a room temperature window (602); the room temperature window shell (601) is provided with an inner cavity, and the room temperature window (602) is made of infrared material and is fixedly installed in the inner cavity of the room temperature window shell (601) by adhesive or pressure ring; the room temperature window shell (601) is provided with external threaded room temperature window threaded sections (603) at both ends for connecting with the room temperature window pressure plate assembly (1); the room temperature window threaded section (603) and the room temperature window shell (601) are reserved with the insertion port of the high thermal resistance closed cold trap (2); one end of the high thermal resistance closed cold trap (2) is fixedly pressed in the insertion port by the room temperature window pressure plate assembly (1) and connected to the room temperature optical structure (7); The cold window assembly (3) includes a cold window shell (303) and a cold window (302); the cold window (302) is provided with an inner cavity, and the cold window (302) is fixed in the inner cavity of the cold window shell (303) by a fluororubber pressure ring or a low-exhaust-rate epoxy resin adhesive; the cold window shell (303) is provided with cold window flanges (301) at both ends, and the cold window flanges (301) are connected to the other end of the high thermal resistance closed cold trap (2) by means of the cold window pressure plate assembly (5); The cold window pressure plate assembly (5) includes a first cold window pressure ring (501) and a second cold window pressure ring (502), both of which are half-circle pressure rings; the other end of the high thermal resistance closed cold trap (2) is connected to the cold window flange (301) of the cold window assembly (3) by countersunk screws. The high thermal resistance enclosed cold trap (2) includes a conical surface (202) and a corrugated surface (203). The conical surface (202) is connected to the ambient temperature window pressure plate assembly (1) through a flange face (201), and the corrugated surface (203) is connected to the cold window assembly (3) through a flange transition surface (204). The corrugated structure of the corrugated surface (203) is used to increase the total length of the transmission path, while increasing the thermal resistance to reduce heat conduction leakage. The device also includes a cold window heating element (4), which is connected to a temperature control circuit or a temperature relay. The cold window heating element (4) is fixed to the outer wall of the opening of the cold optical structure (8) by adhesive and close to the cold window assembly (3) for heating the cold optical structure (8) as needed and preventing the cold window assembly (3) from being contaminated by low temperature adsorption. The method includes the following steps: The two ends of the high thermal resistance sealed cold trap (2) are connected to the room temperature window (602) and the cold window (302) respectively through the flange face one (201) and flange face two (205) via the threaded pressure ring back plate one (102) of the room temperature window pressure plate assembly (1) and the threaded pressure ring back plate two (104) and the cold window pressure ring one (501) and cold window pressure ring two (502) of the cold window pressure plate assembly (5). This allows the cold optical structure (8) and the room temperature optical structure (7) to be physically isolated from the external room temperature environment through the high thermal resistance sealed cold trap (2), effectively preventing external water vapor and condensable volatiles from entering, thereby preventing external organic materials from volatilizing and water vapor from contaminating the cold optical inlet and preventing the instrument performance from degrading. The cold window heating element (4) is glued to the outer wall of the opening of the cold optical structure (8) near the cold window assembly (3) and connected to a temperature control circuit or temperature relay to provide heat energy. It is used to heat and remove a small amount of water vapor in the cold optical structure (8) during the initial stage of the spacecraft's entry into orbit. Once the spacecraft's state is stable, there is no need to perform decontamination heating again. This solves the problem that the spacecraft needs to be decontaminated and heated on-orbit periodically, which prevents continuous operation and affects business applications.

2. The application method of the anti-pollution device for the cold optical system of a space infrared instrument according to claim 1, characterized in that, The ambient temperature window pressure plate assembly (1) includes a threaded pressure ring (101) with internal threads, a threaded pressure ring back plate one (102) and a threaded pressure ring back plate two (104). The threaded pressure ring back plate one (102) and the threaded pressure ring back plate two (104) are half pressure rings, which are fixed to both ends of the threaded pressure ring (101) by countersunk screws (103) to facilitate assembly and integration in a narrow space; the internal thread of the threaded pressure ring (101) is connected to the external thread of the normal temperature window thread section (603); one end of the high thermal resistance closed cold trap (2) passes through the threaded pressure ring (101) of the ring and is fixed and pressed into the connector, and is connected to the normal temperature optical structure (7).

3. The application method of the anti-pollution device for the cold optical system of a space infrared instrument according to claim 1, characterized in that, The high thermal resistance closed cold trap (2) is made of ultra-thin non-metallic material in the shape of a cylinder or a cone, and the inner cavity of the high thermal resistance closed cold trap (2) is slightly larger than the light-transmitting aperture. The two ends of the high thermal resistance closed cold trap (2) are fixed and connected to the ambient temperature window assembly (6) and the cold window assembly (3) respectively by flanges through the ambient temperature window pressure plate assembly (1) and the cold window pressure plate assembly (5).

4. The application method of the anti-pollution device for the cold optical system of a space infrared instrument according to claim 1, characterized in that, The corrugated structure has vent holes on its side, which are used to release air when the air pressure decreases.

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