Dewar assembly and detection apparatus

Abstract

A Dewar assembly and a detection apparatus. The Dewar assembly comprises a housing (110), a cover (210), a gas absorption structure (300), and a plurality of functional devices. The housing (110) and the cover (210) are connected and define a sealed cavity; the plurality of functional devices are all mounted in the sealed cavity; the gas absorption structure (300) is a plate-shaped structural member, and a getter layer is provided on the surface of the gas absorption structure (300); the gas absorption structure (300) is provided between a plurality of functional devices, and / or the gas absorption structure (300) is provided between one functional device and the housing (110).

Description

Dewar components and detection equipment Technical Field

[0001] The present application belongs to the technical field of refrigeration equipment, and specifically relates to a Dewar assembly and a detection device. Background Art

[0002] Low-temperature detectors such as infrared detectors are usually installed on a Dewar assembly to utilize the low temperature and vacuum environment provided by the Dewar assembly.

[0003] Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a Dewar assembly and a detection device, wherein the vacuum reliability of the Dewar assembly is relatively high.

[0005] In a first aspect, an embodiment of the present application discloses a Dewar assembly, which includes a shell, a cover, an air intake structure and multiple functional devices. The shell and the cover are connected to form a sealed cavity, and the multiple functional devices are installed in the sealed cavity. The air intake structure is a plate-like structural member, and a getter layer is provided on the surface of the air intake structure. The air intake structure is provided between the multiple functional devices, and / or the air intake structure is provided between one of the functional devices and the shell.

[0006] In a second aspect, the present application further discloses a detection device, which includes a detector and the above-mentioned Dewar assembly, wherein the detector is disposed in a sealed cavity of the Dewar assembly and mounted on a substrate of the Dewar assembly.

[0007] The present application discloses a dewar assembly, wherein a housing and a cover are interconnected to form a sealed cavity for accommodating multiple functional devices. The dewar assembly also includes an air-intake structure having a getter layer disposed on its surface. The getter structure is disposed between different functional devices and / or between a functional device and the housing. This allows the getter layer to absorb gas within the dewar assembly's sealed cavity after activation, thereby maintaining a relatively long-lasting vacuum environment within the dewar assembly's sealed cavity.

[0008] Moreover, in the Dewar assembly disclosed in the embodiment of the present application, the air intake structure is a plate-like structural member, so that its thickness is relatively small, and the original gaps between the components in the Dewar assembly can be used as the accommodation space for the air intake structure, that is, the internal space of the Dewar assembly is effectively utilized, so there is no need to significantly increase the size of the shell of the Dewar assembly in order to accommodate the air intake structure for absorbing gas. In this way, the size of the shell and the volume of the sealed cavity can be reduced, the leakage rate of the Dewar assembly can be reduced, and the difficulty of forming a vacuum environment in the Dewar assembly can be effectively reduced, thereby ensuring that the vacuum reliability of the Dewar assembly is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0010] FIG1 is a schematic structural diagram of a Dewar assembly disclosed in an embodiment of the present application.

[0011] FIG2 is a cross-sectional schematic diagram of the air intake structure in the Dewar assembly disclosed in an embodiment of the present application.

[0012] Figure markings: 110 - shell body, 120 - base, 210 - cover, 220 - light inlet, 300 - air intake structure, 310 - first plate, 320 - second plate, 330 - activation connector, 410 - base plate, 420 - lead ring, 430 - radiation screen, 440 - cold finger, 450 - cold head, 500 - detector. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0014] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0015] In order to maintain the continuity of its vacuum environment, the current Dewar assembly usually sets a cylindrical or tubular air suction structure inside the shell. The setting of this style of air suction structure makes the size of the Dewar assembly shell relatively large. On the one hand, it will further increase the difficulty of forming a vacuum environment inside the Dewar assembly, and will also greatly increase the leakage rate of the Dewar assembly, resulting in relatively low vacuum reliability of the Dewar assembly.

[0016] As shown in Figures 1 and 2, an embodiment of the present application discloses a Dewar assembly, which includes a shell, a cover 210, an air intake structure 300 and multiple functional devices, wherein the functional device is a general term for devices in the Dewar assembly used to provide corresponding functions, and it includes multiple functional devices, and the multiple functional devices may, for example, include a substrate 410, a radiation screen 430 and a cold finger 440.

[0017] The housing and the cover 210 are both part of the packaging device of the Dewar assembly. The housing and the cover 210 are connected and enclose a sealed cavity. The sealed cavity is used to accommodate other components in the Dewar assembly. Specifically, multiple functional components can be installed within the sealed cavity. Of course, the sealed cavity can also be used to accommodate a detector. More specifically, the housing can include, for example, a shell body 110 and a base 120. The shell body 110 is mounted on the base 120, and the cover 210 is mounted on the side of the shell body 110 facing away from the base 120.

[0018] In addition, a light inlet 220 is typically mounted on the cover 210. The light inlet 220 is formed of a light-transmitting material to ensure that the cover 210 and the housing form a sealed space while allowing external light to enter the dewar assembly and be captured by devices such as the detector 500. Specifically, both the housing and the cover 210 can be formed of a material with relatively high structural strength, such as metal, to provide relatively reliable protection for other devices within the dewar assembly and ensure that the encapsulated devices of the dewar assembly are relatively reliable.

[0019] The getter structure 300 is a device used to absorb gas in the embodiments of the present application. To this end, a getter layer is provided on the surface of the getter structure 300. After the getter layer is activated, the getter structure 300 is able to absorb gas within the sealed cavity. Specifically, the getter layer can be formed on the surface of the getter structure 300 using magnetron sputtering. The getter layer formed in this manner has relatively high adhesion reliability. The getter layer can, for example, include materials such as zirconium oxide, zirconium-vanadium iron, or titanium-zirconium-vanadium. The thickness of the getter layer formed on the surface of the getter structure 300 can, for example, be less than 1 mm, typically around 2 μm. The specific parameters of this thickness can be determined based on actual needs and are not limited herein.

[0020] In addition, before depositing the getter layer on the surface of the getter structure 300, the surface of the getter structure 300 may be pretreated to enhance the deposition and adsorption of the getter layer on the surface of the getter structure 300. If the getter structure 300 is formed of a metal material, the getter structure 300 may be soaked in an alkaline solution and ultrasonic cleaning may be used to remove machining debris from the surface of the getter structure 300. The getter structure 300 may then be soaked in an acidic solution and ultrasonic cleaning may be used to remove the oxide layer from the surface of the getter structure 300. The surface of the getter structure 300 may then be further cleaned by washing with deionized water. The getter structure 300 may then be soaked in a passivation solution to form a passivation layer on the surface of the getter structure 300 to prevent re-oxidation of the surface of the getter structure 300. The getter layer may then be formed on the surface of the getter structure 300 using magnetron sputtering or other methods.

[0021] Furthermore, to prevent the air intake structure 300 from occupying a large space within the dewar assembly, the dewar assembly disclosed in the embodiments of the present application has a plate-like structure. This reduces the space occupied by the air intake structure 300, thereby allowing the gaps between components within the dewar assembly to be used as installation space for the air intake structure 300, effectively utilizing the components within the dewar assembly. The air intake structure 300 can be installed between different functional components within the dewar assembly, and / or between a functional component and the housing. In this case, the size of the dewar assembly housing does not need to be substantially increased, which reduces the difficulty of installing the air intake structure 300 and ensures that the air intake structure 300 is spaced apart from adjacent components. Since the air intake structure 300 itself is a plate-like structure, the required size increase of the dewar assembly housing is also relatively small, and the volume of the sealed chamber is also relatively small. This ensures that the dewar assembly's gas absorption capacity remains relatively strong while the difficulty of creating a vacuum environment within the dewar assembly and the leak rate are relatively low, thereby improving the vacuum reliability of the dewar assembly.

[0022] The present embodiment discloses a dewar assembly, wherein a housing and a cover 210 are interconnected to form a sealed cavity for accommodating multiple functional components within the dewar assembly. The dewar assembly also includes an air-intake structure 300, on the surface of which a getter layer is disposed. The air-intake structure 300 is disposed between different functional components and / or between a functional component and the housing. This allows the getter layer on the getter structure 300 to absorb gas within the sealed cavity of the dewar assembly after activation, thereby maintaining a relatively long-lasting vacuum environment within the sealed cavity. Moreover, in the Dewar assembly disclosed in the embodiment of the present application, the air suction structure 300 is a plate-like structural member, so that the thickness of the air suction structure 300 is relatively small, and the original gaps between the components in the Dewar assembly can be used as the accommodation space of the air suction structure 300, thereby achieving further effective utilization of the internal space of the Dewar assembly, thereby eliminating the need to significantly increase the size of the shell of the Dewar assembly in order to accommodate the air suction structure 300 for absorbing gas. In this way, the size of the shell and the volume of the sealed cavity can be reduced, thereby significantly reducing the leakage rate of the Dewar assembly and reducing the difficulty of forming a vacuum environment in the Dewar assembly, thereby ensuring that the vacuum reliability of the Dewar assembly is relatively high.

[0023] As described above, the functional device may include, for example, a variety of components. In some embodiments of the present application, the functional device includes a substrate 410, which is used to mount the detector 500. Specifically, the substrate 410 may serve as a mounting base for the detector 500, which may be, for example, an infrared detector. Furthermore, to facilitate powering the detector 500, the functional device may also include a wire loop 420. The wire loop 420 is connected to the substrate 410, with a portion of the wire loop 420 extending outside the housing to connect to an external power source or other device, thereby ensuring the normal operation of the detector 500. Furthermore, in the Dewar assembly, the housing may be a special-shaped structure, with a portion of the housing positioned opposite the substrate 410. In this case, the air intake structure 300 may include a first plate 310, which may be sandwiched between the substrate 410 and the housing, thereby utilizing the gap between the substrate 410 and the housing as a storage space for the first plate 310.

[0024] Specifically, the first plate 310 can be a flat plate structure, that is, the surfaces on the opposite sides of the first plate 310 are both flat, and the thickness of the first plate 310 can be flexibly determined based on parameters such as the distance between the part of the shell in the Dewar assembly opposite to the substrate 410 and the substrate 410. Of course, when the gap between the substrate 410 and the shell is relatively small, the size of the shell can be appropriately increased to ensure that the first plate 310 can be installed between the substrate 410 and the shell.

[0025] As mentioned above, the substrate 410 is used to mount the detector 500, and the getter layer is typically activated by heating. Therefore, to prevent the activation process of the getter layer on the first plate 310 from damaging the detector 500 mounted on the substrate 410, when the first plate 310 is sandwiched between the substrate 410 and the housing, as shown in FIG1 , the first plate 310 and the substrate 410 need to be spaced apart. This prevents heat from the first plate 310 from transferring to the substrate 410 and adversely affecting the reliability of the detector 500 mounted on the substrate 410. Of course, specific parameters such as the spacing between the first plate 310 and the substrate 410 can be determined based on actual conditions. Furthermore, if the Dewar assembly includes a wire loop 420, the wire loop 420 can be positioned between the substrate 410 and the first plate 310. This can further prevent the activation process of the first plate 310 from adversely affecting the reliability of the detector 500 mounted on the substrate 410.

[0026] As described above, an absorbent layer is provided on the surface of the absorbent structure 300. When the absorbent structure 300 includes a first plate body 310, the absorbent layer can be provided only on the surface of the first plate body 310 facing the substrate 410, and the first plate body 310 is provided in contact with the shell, and the first plate body 310 and the shell form a fixed connection relationship. In this case, the absorbent layer on the first plate body 310 can be activated by applying heat radiation outside the shell.

[0027] In order to further enhance the air absorption capacity of the first plate 310, a getter layer can be provided on both opposite surfaces of the first plate 310. In this case, in order to ensure that the getter layer on the surface of the first plate 310 facing the housing can effectively function, as shown in FIG1 , the first plate 310 can be spaced apart from the housing. In some embodiments, the spacing between the substrate 410 and the first plate 310 and the spacing between the housing and the first plate 310 can be the same. In another embodiment of the present application, the spacing between the first plate 310 and the substrate 410 (or the wire ring 420) can be greater than the spacing between the first plate 310 and the housing, thereby making the spacing between the first plate 310 and the detector 500 as relatively large as possible, further preventing the activation process of the first plate 310 from adversely affecting the reliability of the detector 500 on the substrate 410.

[0028] When adopting the above technical solution, since the first plate 310 is spaced apart from the housing, and considering that the heat transfer efficiency in a vacuum or near-vacuum environment is relatively low, to ensure relatively good activation efficiency and effectiveness of the getter layer on the first plate 310, the getter structure 300 may further include an activation joint 330, one end of which is connected to the first plate 310, and the other end of which extends outside the housing. This ensures that the getter structure 300 can activate the getter layer on its surface using the activation joint 330. In addition, the activation joint 330 can also provide a fixation for the first plate 310.

[0029] Specifically, in the above embodiment, the getter structure 300 may be formed of a metal material. In this case, the activation joint 330 may heat the getter structure 300 by heat transfer or other means, thereby activating the getter layer on the surface of the getter structure 300. In some embodiments, the activation joint 330 is formed of a metal material, and by connecting the activation joint 330 to an external heat source, heat from the external heat source can be transferred to the getter structure 300 through the activation joint 330.

[0030] Based on the above embodiments, in order to further improve the activation efficiency and effect of the getter layer on the getter structure 300, the number of activation joints 330 can be multiple. When the number of activation joints 330 is multiple and the getter layer is activated by heat transfer, the efficiency and effect of heat transfer to the getter structure 300 can be greatly improved.

[0031] Of course, when there are multiple activation connectors 330, electric heating can also be used to activate the absorbent layer on the surface of the intake structure 300. In this case, two of the activation connectors 330 connected to the first plate 310 can be connected to the positive and negative poles of the power supply respectively, so that the power supply can be used to charge the intake structure 300 to heat the intake structure 300 and activate the absorbent layer on the surface of the intake structure 300.

[0032] As described above, the first plate 310 can be disposed between the base plate 410 and the housing. Considering that the cold finger 440 in the Dewar assembly is typically connected to the central area of ​​the base plate 410, the portion where the cold finger 440 connects to the base plate 410 is the cold head 450. In this case, in order to maximize the area of ​​the first plate 310 and thereby increase the layout area of ​​the getter layer without affecting the normal assembly and normal operation of other components in the Dewar assembly, in some embodiments, the first plate 310 is an annular structure, and the first plate 310 is disposed around the cold finger 440. This maximizes the area of ​​the first plate 310 within an appropriate range. More specifically, the first plate 310 can be designed as an open annular structure or a closed annular structure according to actual conditions.

[0033] As described above, the functional device in the Dewar assembly may include a substrate 410, and the functional device may further include a cold finger 440, which is connected to the substrate 410. The cold finger 440 usually has a certain length, and the cold finger 440 is also surrounded by a part of the shell, that is, a part of the shell is arranged around the outside of the cold finger 440, thereby ensuring that the cold finger 440 is also installed in the sealed cavity.

[0034] Based on this, in this embodiment of the present application, the getter structure 300 may include a second plate 320, which is sandwiched between the cold fingers 440 and the housing. This allows the existing gap between the cold fingers 440 and the housing to serve as a space for the second plate 320, further effectively utilizing the space within the Dewar assembly. Of course, to prevent the heating and activation process of the second plate 320 from adversely affecting the normal operation of the cold fingers 440, in this embodiment of the present application, as shown in FIG1 , the cold fingers 440 are spaced apart from the second plate 320. This also ensures that the getter layer on the surface of the second plate 320 facing the cold fingers 440 can more effectively getter air. In some embodiments, the second plate 320 can also be spaced apart from the housing, allowing the getter layer to be provided on both opposing surfaces of the second plate 320, further enhancing the getter capacity of the second plate 320. Of course, the spacing between the cold fingers 440, the housing, and the second plate 320 can be flexibly adjusted according to actual conditions.

[0035] To further enhance the air absorption capacity of the second plate 320, in one embodiment of the present application, the second plate 320 is an annular structure. Specifically, the second plate 320 can be disposed around the outside of the cold finger 440, and the housing can be further disposed around the outside of the second plate 320, thereby maximizing the area of ​​the second plate 320 within a limited space. Furthermore, if the air absorption structure 300 includes the first plate 310, the second plate 320 can be fixed to the side of the first plate 310 facing away from the base plate 410. Of course, if the air absorption structure 300 does not include the first plate 310, an activation joint or other method can be provided on the second plate 320 to secure the second plate 320 and ensure that the getter layer on the second plate 320 can be properly activated.

[0036] In some embodiments, the second plate body 320 is an arc-shaped plate-like structural member, that is, the second plate body 320 can be a structure with a side pattern such as a cylindrical or truncated cone structure. When the second plate body 320 is an annular structural member, the shape of the second plate body 320 is the same as the side of the hollow cylindrical structure, or the shape of the second plate body 320 is the same as the side of the hollow truncated cone structure. In another embodiment of the present application, in order to further increase the surface area of ​​the second plate 320 so as to increase the coverage area of ​​the getter layer, as shown in FIG2 , the surface of the second plate 320 facing the cold finger 440 can be intercepted by a plane along the thickness direction of the substrate 410 (for example, direction A in FIG2 ), and the line segment includes a plurality of sub-line segments, and the plurality of sub-line segments are connected end to end in sequence. The sub-line segments can be, for example, straight lines or arcs. When the sub-line segments are straight lines, the sub-line segments have an extension direction. When the sub-line segments are arcs, the sub-line segments have a bending direction. Based on this, in the embodiment of the present application, the extension direction or bending direction of at least two sub-line segments are different, so that the surface area of ​​the second plate 320 can be increased while the size of the second plate 320 along the thickness direction of the substrate 410 remains unchanged.

[0037] In the above embodiment, the line segment obtained by cutting the surface of the second plate 320 facing the cold finger 440 along a plane perpendicular to the thickness direction of the base plate 410 may be a continuous straight line or a continuous arc.

[0038] In another embodiment of the present application, the line segment obtained by intercepting the surface of the second plate 320 facing the cold finger 440 along a plane perpendicular to the thickness direction of the substrate 410 may include multiple sub-line segments, and the multiple sub-line segments are connected end to end in sequence, and the extension direction or bending direction of at least two sub-line segments are different. This can also increase the surface area of ​​the second plate 320 while keeping the size of the second plate 320 in the thickness direction perpendicular to the substrate 410 unchanged. When the technical solution of this embodiment is adopted, the line segment obtained by intercepting the surface of the second plate 320 facing the cold finger 440 along the plane along the thickness direction of the substrate 410 may include the above-mentioned multiple sub-line segments, or the line segment may also be a continuous straight line or a continuous arc.

[0039] In some embodiments, the surface of the second plate 320 facing the cold fingers 440 can be increased in area by providing projections or depressions. In other embodiments of the present application, the surface area of ​​the second plate 320 facing the cold fingers 440 can be increased by providing the second plate 320 with a corrugated or zigzag structure. When the second plate 320 is spaced apart from the housing, the technical solutions disclosed in the above embodiments can also be used to increase the surface area of ​​the second plate 320 facing the housing.

[0040] To further enhance the vacuum reliability of the sealed chamber within the Dewar assembly, in some embodiments, a getter layer is provided on the inner wall of the housing. Specifically, the inner wall of the housing inherently possesses the ability to absorb gas, further increasing the area within the Dewar assembly where the getter layer can be disposed. Similarly, the getter layer on the inner wall of the housing can also be formed using methods such as magnetron sputtering. Prior to forming the getter layer, the housing can also be pretreated to enhance adhesion and adsorption of the getter layer to the housing.

[0041] As mentioned above, the Dewar assembly also includes a housing 210. Based on this, a getter layer can also be provided on the inner wall of the housing 210. Of course, in order to prevent the getter layer from interfering with the light-entering performance of the housing 210, the getter layer can be omitted from the inner wall of the light-entering member 220 in the housing 210. In addition, getter layers can be provided on both the inner and outer walls of the radiation shield 430 in the Dewar assembly to further increase the amount of getter layer provided in the Dewar assembly and improve the vacuum reliability and sustainability of the Dewar assembly.

[0042] Based on the Dewar assembly disclosed in any of the above embodiments, the present application also discloses a detection device, which includes a detector 500 and any of the above Dewar assemblies. The detector 500 can specifically be an infrared detector. The detector 500 is arranged in the sealed cavity of the Dewar assembly, and the detector 500 is installed on the substrate 410 of the Dewar assembly. The substrate 410 of the Dewar assembly is installed on the cold finger 440 of the Dewar assembly. With the help of the cold finger 440, a lower temperature environment can be provided for the detector 500.

[0043] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0044] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A dewar assembly, comprising a shell, a cover (210), an air intake structure (300) and a plurality of functional devices, in, The shell and the cover (210) are connected to form a sealed cavity. The plurality of functional devices are all installed in the sealed cavity, The air-intake structure (300) is a plate-shaped structural member, and a getter layer is provided on the surface of the air-intake structure (300). The air intake structure is arranged between the plurality of functional devices, and / or the air intake structure is arranged between one of the functional devices and the housing.

2. The Dewar assembly according to claim 1, wherein: The plurality of functional devices include a substrate (410), wherein the substrate (410) is used to mount a detector. A portion of the housing is disposed opposite to the substrate (410), The air intake structure (300) comprises a first plate body (310), wherein the first plate body (310) is sandwiched between the substrate (410) and the shell, and the first plate body (310) is spaced apart from the substrate (410).

3. The Dewar assembly according to claim 2, wherein: The getter layer is provided on two opposite surfaces of the first plate body (310).

4. The Dewar assembly according to claim 3, wherein: The distance between the substrate (410) and the first plate body (310) is greater than or equal to the distance between the shell and the first plate body (310).

5. The Dewar assembly according to claim 2, wherein: The getter layer is provided on a surface of the first plate body (310) facing the substrate (410), and the first plate body (310) is arranged in close contact with the shell.

6. The Dewar assembly according to claim 3 or 4, wherein: The air suction structure (300) further comprises an activation joint (330), One end of the activation connector (330) is connected to the first plate body (310), and the other end of the activation connector (330) extends out of the shell.

7. The Dewar assembly according to claim 6, wherein: The number of the activation joints is multiple.

8. The Dewar assembly according to any one of claims 2 to 7, wherein: The first plate body (310) is an annular structural member.

9. The Dewar assembly according to claim 1, wherein: The plurality of functional devices include a substrate (410) and a cold finger (440), wherein the substrate (410) is used to mount the detector (500), and the cold finger (440) is connected to a side of the substrate (410) facing away from the detector (500). A portion of the housing is disposed around the outside of the cold finger (440), The air suction structure (300) comprises a second plate (320), wherein the second plate (320) is sandwiched between the cold finger (440) and the shell, and the cold finger (440) and the second plate (320) are spaced apart.

10. The Dewar assembly according to claim 9, wherein: The second plate body (320) is an annular structural member.

11. The Dewar assembly according to claim 9, wherein: A line segment obtained by cutting a surface of the second plate body (320) facing the cold finger (440) along a plane in the thickness direction of the substrate (410) includes a plurality of sub-line segments, the plurality of sub-line segments are sequentially connected end to end, and at least two of the sub-line segments have different extension directions or bending directions.

12. The Dewar assembly according to any one of claims 9 to 11, wherein: A line segment of the second plate body (320) cut along a plane perpendicular to the thickness direction of the substrate (410) from the surface of the second plate body (320) toward the cold finger (440) includes a plurality of sub-line segments, wherein the plurality of sub-line segments are sequentially connected end to end, and at least two of the sub-line segments have different extension directions or bending directions.

13. The Dewar assembly according to any one of claims 1 to 12, wherein: The inner wall of the shell is provided with a getter layer.

14. The Dewar assembly according to any one of claims 1 to 13, wherein: The inner wall of the cover body (210) is provided with a getter layer; and / or The Dewar assembly further comprises a radiation screen (430), and a getter layer is arranged on the inner wall and the outer wall of the radiation screen (430).

15. A detection device, comprising a detector (500) and the Dewar assembly according to any one of claims 1 to 14, wherein the detector (500) is arranged in a sealed cavity of the Dewar assembly and mounted on a substrate (410) of the Dewar assembly.

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