Spectroscope fixing assembly applied to low temperature

Abstract

The invention discloses a spectroscope fixing assembly for low-temperature application. The spectroscope fixing assembly comprises a spectroscope mounting frame, a spectroscope, a flexible heat conduction pad and a cover plate. During installation, the spectroscope is placed in the installation groove of the spectroscope installation frame, the thickness of the spectroscope is controlled to be slightly larger than the depth of the installation groove, and the flexible heat conduction pad is attached to the edges of the spectroscope and the spectroscope installation frame and fixed after being covered with the cover plate. Wherein the cover plate and the spectroscope mounting frame are made of low-expansion alloy materials, and the surfaces of the cover plate and the spectroscope mounting frame are subjected to low-reflectivity blackening treatment before assembly. The spectroscope is simple in structure and convenient to assemble, especially the spectroscope bears low stress in low-temperature application, and the low-temperature surface type of the spectroscope can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of optical-mechanical assembly and adjustment, and in particular to a beam splitter assembly structure suitable for fixing optical elements such as multi-band semi-transparent and semi-reflective beam splitters. Background Art

[0002] Multi-band infrared detectors are widely used in the fields of earth remote sensing, astronomical observation, medical imaging and scientific research. The semi-transparent and semi-reflective function of the spectroscope can be used to arrange detectors with different response wavelengths at different positions in space to achieve multi-band detector fusion imaging. At present, the integrated structure of a single-chip spectroscope is mainly divided into a clamping structure, a bonding structure and a supporting structure.

[0003] Chinese utility model CN219641996U discloses a beam splitter clamping device, which can quickly clamp and fix beam splitters of different sizes by fixing the beam splitter in an adjustable clamping manner, but this technical solution is only suitable for temporary fixation.

[0004] Chinese invention application CN112285861A discloses a stress-free bonding method for a dual-band spectroscope made of zinc sulfide material. The technical solution is to fix the spectroscope by glue injection. This fixing method has the difficulty of stress control at low temperatures. In addition, it is difficult to disassemble and adjust the spectroscope when the surface shape does not meet the standards. Summary of the invention

[0005] The purpose of the present invention is to provide a spectroscope assembly structure, which solves the problems in the prior art of being easy to deform, difficult to disassemble, only temporarily fixed and unable to be used at low temperatures.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A spectroscope fixing assembly for low temperature applications, comprising a spectroscope mounting frame, a spectroscope, a flexible heat conductive pad, and a cover plate; the spectroscope mounting frame is provided with a frame and a first light through hole, the frame is provided with a mounting groove, and the edge of the spectroscope is embedded in the mounting groove; the cover plate is a frame structure, which is provided with an outer frame and a second light through hole, and the cover plate is adapted to the spectroscope mounting frame;

[0008] A flexible thermal pad is also arranged between the beam splitter mounting frame and the cover plate; the flexible thermal pad is a frame-type thin sheet structure, the beam splitter is arranged between the flexible thermal pad and the beam splitter mounting frame, and the cover plate is covered on the flexible thermal pad;

[0009] The thickness of the beam splitter is slightly larger than the depth of the mounting groove, and the flexible thermal pad is attached to the edge of the beam splitter and the beam splitter mounting frame. After the cover is put on, the beam splitter mounting frame, the beam splitter, the flexible thermal pad and the cover are fixed by fixing elements;

[0010] The beam splitter mounting frame and the cover plate are made of the same low expansion alloy material; the flexible thermal pad is made of a high thermal conductivity and low temperature resistant material.

[0011] The shape of the flexible thermal pad is matched with the beam splitter mounting frame, and is provided with a thermal pad outer frame and a third light-through hole, and the outer frame of the cover plate is covered on the thermal pad outer frame.

[0012] The flexible thermal pad is made of indium sheet.

[0013] The beam splitter is rectangular or elliptical, and the mounting groove is correspondingly rectangular or elliptical.

[0014] The beam splitter mounting frame and cover are made of alloy material with low reflectivity black nickel plating.

[0015] The beamsplitter mounting frame and cover are made of Invar alloy.

[0016] Screw holes are arranged at corresponding positions of the frame of the spectroscope mounting frame, the thermal pad outer frame of the flexible thermal pad and the outer frame of the cover plate; screws are passed through the screw holes on the outer frame, the thermal pad outer frame and the frame to fix the spectroscope mounting frame, the spectroscope, the flexible thermal pad and the cover plate.

[0017] The beam splitter is embedded in the installation groove, and there is a gap between the beam splitter and the installation groove; the area of ​​the beam splitter is larger than the areas of the first light through hole, the second light through hole and the third light through hole.

[0018] The spectroscope is made of germanium.

[0019] The beam splitter is installed on the mounting groove by using low-temperature epoxy glue; the flexible thermal pad is covered on the surface of the beam splitter and the beam splitter mounting frame, and the first light through hole and the third light through hole are kept aligned; the second light through hole of the cover plate is aligned with the third light through hole, and the beam splitter mounting frame, the beam splitter, the flexible thermal pad and the cover plate are fixed by fixing elements.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention adopts a frame structure, which is easy to assemble; 2. The spectroscope mounting frame and cover plate are both made of low-expansion alloy materials, and a flexible thermal pad is used to suppress the stress concentration problem caused by the difference in thermal expansion coefficient at low temperature, effectively controlling the low-temperature surface shape of the color separation sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the beam splitter installation frame of the present invention;

[0024] In the figure: 1-beam splitter mounting frame; 11-frame; 12-first light-through hole; 13-mounting slot; 2-beam splitter; 3-flexible thermal pad; 31-thermal pad outer frame; 32-third light-through hole; 4-cover plate; 41-outer frame; 42-second light-through hole; 5-screw. DETAILED DESCRIPTION

[0025] In order to more concisely describe the present embodiment, some parts known to those skilled in the art but not related to the main content of the present invention are omitted in the drawings or descriptions. In addition, for the convenience of description, some parts in the drawings are omitted, enlarged or reduced, but they do not represent the size or entire structure of the actual product.

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] The present invention is further described below in conjunction with the accompanying drawings, which are only used for exemplary description and cannot be understood as limiting the present invention.

[0028] The present invention will now be further described with reference to the embodiments and the accompanying drawings:

[0029] The present invention relates to a spectroscope fixing assembly for low temperature applications, such as Figure 1 As shown, it includes a beam splitter mounting frame 1, a beam splitter 2, a flexible thermal pad 3, and a cover plate 4; the beam splitter mounting frame 1 is provided with a frame 11 and a first light through hole 12, the frame 11 is provided with a mounting groove 13, and the edge of the beam splitter 2 is embedded in the mounting groove 13. Preferably, as Figure 2 As shown, the beam splitter 2 is embedded in the mounting groove 13, and there is a gap between the beam splitter 2 and the mounting groove 13; the bottom of the mounting groove 13 is flat, and the shape of the mounting groove 13 is consistent with the shape of the beam splitter 2. The shape of the beam splitter 2 is preferably square or elliptical. If the length or major axis of the beam splitter 2 is a, the width or minor axis of the beam splitter 2 is b, and the thickness of the beam splitter 2 is c; then, the length or major axis of the mounting groove 13 is a~a+0.1mm, the width or minor axis is b~b+0.1mm, the depth of the mounting groove 13 is c~c-0.02mm, and the thickness of the beam splitter 2 is slightly greater than the depth of the mounting groove 13.

[0030] The cover plate 4 is a frame structure, which is provided with an outer frame 41 and a second light-through hole 42 . The cover plate 4 is adapted to the beam splitter mounting frame 1 .

[0031] like Figure 1As shown, a flexible thermal pad 3 is further arranged between the spectroscope mounting frame 1 and the cover plate 4; the flexible thermal pad 3 is a frame-type thin film structure, the spectroscope 2 is arranged between the flexible thermal pad 3 and the spectroscope mounting frame 1, and the cover plate 4 covers the flexible thermal pad 3.

[0032] The shape of the flexible thermal pad 3 is adapted to the spectroscope mounting frame 1 , and is provided with a thermal pad outer frame 31 and a third light through hole 32 . The outer frame 41 of the cover plate 4 covers the thermal pad outer frame 31 .

[0033] The area of ​​the beam splitter 2 is larger than the areas of the first light through hole 12 , the second light through hole 42 and the third light through hole 32 .

[0034] The flexible thermal pad 3 is attached to the edges of the beam splitter 2 and the beam splitter mounting frame 1. After the cover plate 4 is covered, the beam splitter mounting frame 1, the beam splitter 2, the flexible thermal pad 3 and the cover plate 4 are fixed by fixing elements.

[0035] Preferably, screw holes are provided at corresponding positions of the frame 13 of the spectroscope mounting frame 1, the thermal pad outer frame 31 of the flexible thermal pad 3 and the outer frame 41 of the cover plate 4; screws 5 are passed through the screw holes on the outer frame 41, the thermal pad outer frame 31 and the frame 13 to fix the cover plate 4, the flexible thermal pad 3, the spectroscope 2 and the spectroscope mounting frame 1.

[0036] The beam splitter mounting frame 1 and the cover plate 4 are made of the same low expansion alloy material; the flexible thermal pad 3 is made of a high thermal conductivity and low temperature resistant material.

[0037] A preferred embodiment is that the spectroscope 2 is made of germanium material, the size of the spectroscope 2 is a rectangle of 50mmⅹ40mmⅹ3mm, the surface of the spectroscope 2 is 1.3±0.05mm on one side without coating, and the perpendicularity tolerance between the side surface of the spectroscope is better than 0.02mm; the spectroscope mounting frame 1 and the cover plate 4 are made of Invar alloy with low expansion coefficient; the flexible thermal pad 3 is made of 0.1mm thick indium sheet with high thermal conductivity and low temperature resistance.

[0038] The bottom of the mounting groove 13 is flat, the flatness tolerance of the mounting groove 13 surface is better than 0.02mm, the shape of the mounting groove 13 is consistent with the shape of the spectrometer 2, the length of the mounting groove 13 is 50-50.1mm, the width is 40-40.1mm, and the depth is 2.98-3mm. The spectrometer mounting frame 1 is machined and then subjected to low-temperature stabilization treatment, and the spectrometer mounting frame 1 is subjected to low-reflectivity black nickel plating treatment.

[0039] The flexible thermal pad 3 is a frame-type thin film structure. The length of the flexible third light hole 32 is 49.0-49.2 mm, and the width is 39.0-39.2 mm. The edge of the flexible thermal pad 3 is provided with screw holes corresponding to the position of the spectroscope mounting frame 1. The whole is processed by laser cutting method, and the oxidized surface is wiped with alcohol after cutting.

[0040] The cover plate 4 is a frame structure, the size of the second light hole 42 is smaller than that of the third light hole 32, the length of the second light hole 42 is 48.5-48.6 mm, and the width is 38.5-38.6 mm; low-stress chemical etching is adopted, and screw holes corresponding to the positions of the spectroscope mounting frame 1 are provided on the edges of the cover plate 4, and then low-temperature stabilization treatment is performed, and the cover plate 4 is subjected to low-reflectivity black nickel plating treatment.

[0041] The spectrometer 2 is mounted on the mounting groove 13 using low-temperature epoxy glue; the flexible thermal pad 3 is covered on the surface of the spectrometer 2 and the spectrometer mounting frame 1, and the first light hole 12 and the third light hole 32 are kept aligned; the second light hole 42 of the cover plate 4 is aligned with the third light hole 32, and the spectrometer mounting frame 1, the spectrometer 2, the flexible thermal pad 3, and the cover plate 4 are fixed by fixing elements.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. That is, any equivalent changes and modifications made according to the content of the patent application scope of the present invention should be within the technical scope of the present invention.

Claims

1. A spectroscope fixing assembly for low temperature applications, characterized in that: The invention comprises a beam splitter installation frame (1), a beam splitter (2), a flexible heat conductive pad (3), and a cover plate (4); the beam splitter installation frame (1) is provided with a frame (11) and a first light through hole (12); the frame (11) is provided with a mounting groove (13), and the edge of the beam splitter (2) is embedded in the mounting groove (13); the cover plate (4) is a frame structure, which is provided with an outer frame (41) and a second light through hole (42); the cover plate (4) is adapted to the beam splitter installation frame (1); A flexible thermal pad (3) is also arranged between the beam splitter mounting frame (1) and the cover plate (4); the flexible thermal pad (3) is a frame-type thin sheet structure, the beam splitter (2) is arranged between the flexible thermal pad (3) and the beam splitter mounting frame (1), and the cover plate (4) covers the flexible thermal pad (3); The thickness of the beam splitter (2) is slightly greater than the depth of the mounting groove (13); the flexible thermal pad (3) is attached to the edges of the beam splitter (2) and the beam splitter mounting frame (1); after the cover plate (4) is covered, the beam splitter mounting frame (1), the beam splitter (2), the flexible thermal pad (3) and the cover plate (4) are fixed by fixing elements; The spectroscope mounting frame (1) and the cover plate (4) are made of the same low expansion alloy material; the flexible thermal pad (3) is made of a high thermal conductivity and low temperature resistant material.

2. The spectroscope fixing assembly for low temperature applications according to claim 1, characterized in that: The shape of the flexible thermal pad (3) is compatible with the spectroscope mounting frame (1), and is provided with a thermal pad outer frame (31) and a third light-through hole (32). The outer frame (41) of the cover plate (4) covers the thermal pad outer frame (31).

3. The spectroscope fixing assembly for low temperature applications according to claim 1, characterized in that: The flexible thermal conductive pad (3) is made of an indium sheet.

4. The spectroscope fixing assembly for low temperature applications according to claim 1, characterized in that: The beam splitter (2) is rectangular or elliptical, and the mounting groove (13) is correspondingly rectangular or elliptical.

5. The spectroscope fixing assembly for low temperature applications according to claim 1, characterized in that: The beam splitter mounting frame (1) and the cover plate (4) are made of Invar alloy.

6. The spectroscope fixing assembly for low temperature applications according to claim 5, characterized in that: The beam splitter mounting frame (1) and the cover plate (4) are made of an alloy material that has been subjected to a low-reflectivity black nickel plating treatment.

7. The spectroscope fixing assembly for cryogenic applications according to claim 2, characterized in that: Screw holes are arranged at corresponding positions on the frame (13) of the beam splitter mounting frame (1), the thermal pad outer frame (31) of the flexible thermal pad (3) and the outer frame (41) of the cover plate (4); screws (5) are passed through the screw holes on the outer frame (41), the thermal pad outer frame (31) and the frame (13) to fix the beam splitter mounting frame (1), the beam splitter (2), the flexible thermal pad (3) and the cover plate (4).

8. The spectroscope fixing assembly for cryogenic applications according to claim 2, characterized in that: The beam splitter (2) is embedded in the mounting groove (13), and there is a gap between the beam splitter (2) and the mounting groove (13); the area of ​​the beam splitter (2) is larger than the areas of the first light through hole (12), the second light through hole (42) and the third light through hole (32).

9. The spectroscope fixing assembly for low temperature applications according to any one of claims 1 to 8, characterized in that: The beam splitter (2) is made of germanium.

10. The spectroscope fixing assembly for low temperature applications according to claim 2, 7 or 8, characterized in that: The beam splitter (2) is mounted on the mounting groove (13) by using low-temperature epoxy glue; a flexible thermal pad (3) is covered on the surface of the beam splitter (2) and the beam splitter mounting frame (1), and the first light through hole (12) and the third light through hole (32) are kept aligned; the second light through hole (42) of the cover plate (4) is aligned with the third light through hole (32), and the beam splitter mounting frame (1), the beam splitter (2), the flexible thermal pad (3), and the cover plate (4) are fixed by using fixing elements.

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