CN112067141A

CN112067141A - Infrared detector

Info

Publication number: CN112067141A
Application number: CN202010699482.XA
Authority: CN
Inventors: 洪晓麦; 沈星; 王立保
Original assignee: Wuhan Gaoxin Technology Co Ltd
Current assignee: Wuhan Gaoxin Technology Co Ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-12-11

Abstract

The invention provides an infrared detector which comprises a Dewar assembly, wherein the Dewar assembly comprises a Dewar shell, an insulator, a getter, a spiral fixing piece and an L-shaped supporting piece, the insulator is fixedly arranged on the Dewar shell, the getter comprises a getter main body and activation pins arranged at two ends of the getter main body, the spiral fixing piece is spirally wound on the getter main body, two ends of the spiral fixing piece are fixedly arranged on the inner wall of the Dewar shell, one of the activation pins at two ends of the getter is electrically connected with the insulator, the other activation pin is electrically connected with the L-shaped supporting piece, and the L-shaped supporting piece is fixedly arranged on the inner wall of the Dewar shell. The spiral fixing piece in the infrared detector is in spiral line contact with the getter body, and particles in the getter are not easy to fall off to generate redundancy when the spiral fixing piece and the getter move relatively.

Description

Infrared detector

Technical Field

The invention relates to the technical field of infrared detection, in particular to an infrared detector.

Background

The existing infrared detector assembly mainly comprises a chip, a Dewar assembly and a refrigerator. Vacuum life is an important reliability indicator for infrared detector dewar assemblies. In order to ensure the vacuum reliability of the infrared detector, an activatable getter can be arranged in the dewar assembly, and after the infrared detector assembly is used for a period of time, the getter in the dewar assembly can be activated, so that the vacuum service life of the dewar assembly is prolonged, and the reliability of the infrared detector is improved.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a dewar assembly in an infrared detector in the prior art, in a conventional infrared detector dewar assembly, an Ω -shaped metal ring 110 is used to fix getters, and the getters are axially arranged along a dewar housing in the dewar assembly, a plurality of getters are connected in series through a shorting strip 120 to form a getter group, one of activation pins at two ends of the getter group is electrically connected to an insulator 130, and the other is electrically connected to an L-shaped support plate 140, the insulator 130 is connected to the housing in the dewar assembly, and the L-shaped support plate 140 is connected to the housing in the dewar assembly, so that an activation conduction loop of the getter group and the housing in the dewar assembly can be formed.

However, during the use process, the edge of the Ω -shaped metal ring 110 is in close contact with the getter, and during the vibration process, the edge of the Ω -shaped metal ring 110 and the getter move relatively, so that particles in the getter are easy to fall off, and redundancy is generated.

Disclosure of Invention

The invention aims to provide an infrared detector, which aims to solve the problem that particles in a getter in the existing infrared detector are easy to partially fall off to generate redundancy.

In order to solve the technical problem, the invention provides an infrared detector which comprises a Dewar assembly, wherein the Dewar assembly comprises a Dewar shell, an insulator, a getter, a spiral fixing piece and an L-shaped supporting piece, the insulator is fixedly arranged on the Dewar shell, the getter comprises a getter main body and activating pins arranged at two ends of the getter main body, the spiral fixing piece is spirally wound on the getter main body, two ends of the spiral fixing piece are fixedly arranged on the inner wall of the Dewar shell, one of the activating pins at two ends of the getter is electrically connected with the insulator, the other activating pin is electrically connected with the L-shaped supporting piece, and the L-shaped supporting piece is fixedly arranged on the inner wall of the Dewar shell.

Optionally, the getter body is disposed in a direction perpendicular to an axial direction of the dewar housing.

Optionally, the spiral fixing member is a torsion spring, and two free ends of the torsion spring are respectively fixedly connected with the dewar shell.

Optionally, the insulator is fixedly arranged on the dewar shell in a vacuum brazing manner.

Optionally, the insulator includes an insulator main body and an electrode disposed on the insulator main body, and an activation pin at one end of the getter is welded to the electrode.

Optionally, an installation through hole is formed in the inner wall of the dewar shell, and the insulator main body is inserted into the installation through hole.

Optionally, the two ends of the spiral fixing member are fixed on the dewar shell in a laser spot welding manner respectively.

Optionally, one of the activating pins at the two ends of the getter is electrically connected with the insulator in a laser spot welding manner, and the other activating pin is electrically connected with the L-shaped support piece in a laser spot welding manner.

Optionally, the dewar shell is made of metal, and the L-shaped support sheet is a metal sheet.

Optionally, the refrigerator is further included, and the dewar assembly is fixedly connected with the refrigerator.

The infrared detector provided by the invention has the following beneficial effects:

firstly, the spiral fixing piece is spirally wound on the getter main body, and two ends of the spiral fixing piece are fixedly arranged on the inner wall of the Dewar shell, so that the getter main body is fixedly arranged on the inner wall of the Dewar shell.

Secondly, through setting up the getter main part along the direction of perpendicular to the axial of dewar casing, so can make the compact structure of dewar subassembly to the space that the reducible getter main part took up in the axial of dewar casing, thereby make the length in the axial of dewar casing shorten, and the space that less dewar casing's inner chamber took up.

Drawings

FIG. 1 is a schematic diagram of a dewar assembly in a prior art mid-IR detector;

FIG. 2 is a schematic diagram of an infrared detector in an embodiment of the invention;

FIG. 3 is a schematic diagram of the construction of a Dewar assembly in an infrared detector in accordance with an embodiment of the present invention;

fig. 4 is a top view of a dewar assembly in an infrared detector according to an embodiment of the present invention.

Description of reference numerals:

background art:

a 110-omega type metal ring; 120-shorting pad; 130-an insulator; 140-L-shaped support sheet;

Detailed Description

200-a dewar assembly; 210-a dewar housing; 220-an insulator; 230-a getter; 231-a getter body; 232-activating the guide pin; 240-a helical fixation member; a 250-L shaped support sheet;

300-refrigerator.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present embodiment provides an infrared detector. Referring to fig. 2, 3 and 4, fig. 2 is a schematic structural view of an infrared detector according to an embodiment of the present invention, fig. 3 is a schematic structural view of a dewar assembly 200 in the infrared detector according to the embodiment of the present invention, and fig. 4 is a top view of the dewar assembly 200 in the infrared detector according to the embodiment of the present invention, the infrared detector including the dewar assembly 200 and a refrigerator 300, the dewar assembly 200 and the refrigerator 300 being fixedly connected.

Referring to fig. 3 and 4, the dewar assembly 200 includes a dewar housing 210, an insulator 220, a getter 230, a screw holder 240, and an L-shaped support plate 250. The insulator 220 is fixedly arranged on the dewar housing 210, the getter 230 comprises a getter body 231 and activating pins 232 arranged at two ends of the getter body 231, the spiral fixing member 240 is spirally wound on the getter body 231, two ends of the spiral fixing member 240 are fixedly arranged on the inner wall of the dewar housing 210, one of the activating pins 232 at two ends of the getter 230 is electrically connected with the insulator 220, the other activating pin is electrically connected with the L-shaped supporting plate 250, and the L-shaped supporting plate 250 is fixedly arranged on the inner wall of the dewar housing 210.

The spiral fixing piece 240 is spirally wound on the getter main body 231, and two ends of the spiral fixing piece 240 are fixedly arranged on the inner wall of the Dewar shell 210, so that the getter main body 231 is fixedly arranged on the inner wall of the Dewar shell 210, and the spiral fixing piece 240 is fixedly connected with the getter main body 231 in a spiral winding mode, so that the spiral fixing piece 240 and the getter main body 231 are in spiral line contact, and particles in the getter 230 are not easy to fall off to generate redundancy when the spiral fixing piece 240 and the getter 230 move relatively.

Specifically, the insulator 220 is fixedly disposed on the dewar housing 210 by vacuum brazing. The two ends of the spiral fixing member 240 are fixed on the dewar housing 210 by laser spot welding, respectively. One of the active pins 232 at the two ends of the getter 230 is electrically connected to the insulator 220 by laser spot welding, and the other is electrically connected to the L-shaped support plate 250 by laser spot welding.

Preferably, as shown in fig. 4, the getter body 231 is disposed along a direction perpendicular to the axial direction of the dewar housing, so that the structure of the dewar assembly 200 can be compact, and the space occupied by the getter body 231 in the axial direction of the dewar housing can be reduced, thereby reducing the length of the dewar housing in the axial direction and the space occupied by the inner cavity of the dewar housing.

Referring to fig. 3 and 4, the spiral fixing member 240 is a torsion spring, and two free ends of the torsion spring are fixedly connected to the dewar housing 210, respectively. The torsion spring is spirally wound around the getter body 231, so that the clamping force of the spiral fixing member 240 to the getter body 231 can be more uniform.

Referring to fig. 3 and 4, the dewar housing 210 has a cylindrical shape. The dewar housing 210 is made of metal.

The insulator 220 includes an insulator body and an electrode disposed on the insulator body, and an activation pin 232 at one end of the getter 230 is welded to the electrode on the insulator body. The inner wall of the dewar housing 210 is provided with a mounting through hole, and the insulator main body is inserted into the mounting through hole.

The L-shaped support plate 250 is a metal plate.

Compared with the infrared detector in the prior art, the infrared detector in the invention has the following advantages:

firstly, the spiral fixing member 240 is spirally wound on the getter main body 231, and two ends of the spiral fixing member 240 are fixedly arranged on the inner wall of the dewar shell 210, so that the getter main body 231 is fixedly arranged on the inner wall of the dewar shell 210, because the spiral fixing member 240 is fixedly connected with the getter main body 231 in a spirally winding manner, the spiral fixing member 240 and the getter main body 231 can be in spiral line contact, and particles in the getter 230 are not easy to fall off to generate redundancy when the spiral fixing member 240 and the getter 230 move relatively.

Secondly, by arranging the getter body 231 in a direction perpendicular to the axial direction of the dewar housing, the structure of the dewar assembly 200 can be made compact, and the space occupied by the getter body 231 in the axial direction of the dewar housing can be reduced, so that the length of the dewar housing in the axial direction can be shortened, and the space occupied by the inner cavity of the dewar housing can be reduced.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims

1. The utility model provides an infrared detector, its characterized in that includes the dewar subassembly, the dewar subassembly includes dewar shell, insulator, getter, spiral mounting and L type backing sheet, the insulator is fixed to be set up on the dewar shell, the getter includes the getter main part and sets up activation lead pin on the both ends of getter main part, spiral mounting spiral winding is in the getter main part, the both ends of spiral mounting are fixed to be set up on the inner wall of dewar shell, activation lead pin at getter both ends one with the insulator electricity is connected, another with L type backing sheet electricity is connected, L type backing sheet is fixed to be set up on the inner wall of dewar shell.

2. The infrared detector as set forth in claim 1, wherein said getter body is disposed in a direction perpendicular to an axial direction of said dewar housing.

3. The infrared detector as set forth in claim 1, wherein said coil fixing member is a torsion spring, and both free ends of said torsion spring are fixedly connected to said dewar housing, respectively.

4. The infrared detector as set forth in claim 1, wherein said insulator is fixedly disposed on the dewar housing by means of vacuum brazing.

5. The infrared detector as set forth in claim 4, wherein said insulator includes an insulator body and an electrode disposed on said insulator body, an activation pin at one end of said getter being welded to said electrode.

6. The infrared detector as set forth in claim 5, wherein said dewar shell has an inner wall formed with a mounting through hole, said insulator body being inserted in said mounting through hole.

7. The infrared detector as set forth in claim 1, wherein said spiral fixing member is fixed at both ends thereof to said dewar shell by laser spot welding, respectively.

8. The infrared detector as set forth in claim 1, wherein said active pins at both ends of said getter are electrically connected to said insulator by laser spot welding one and to said L-shaped support plate by laser spot welding the other.

9. The infrared detector as set forth in claim 1, wherein said dewar shell is made of metal, and said L-shaped support piece is made of metal sheet.

10. The infrared detector as set forth in claim 1, further comprising a cryocooler, said dewar assembly and said cryocooler being fixedly attached.