A beam splitter fixing assembly for low temperature applications

Abstract

The present invention discloses a spectroscope fixing assembly for low-temperature applications, comprising a spectroscope mounting frame, a spectroscope, a flexible thermal pad, and a cover plate. During installation, the spectroscope is placed in the mounting groove of the spectroscope mounting frame, the thickness of the spectroscope is controlled to be slightly larger than the depth of the mounting groove, the flexible thermal pad is attached to the edges of the spectroscope and the spectroscope mounting frame, and the cover plate is placed to secure the assembly. The cover plate and the spectroscope mounting frame are both made of low-expansion alloy material, and the surface is treated with a low-reflectivity blackening treatment before assembly. The present invention has a simple structure and is easy to assemble. In particular, when used at low temperatures, the spectroscope is subjected to low stress, which can ensure the low-temperature surface shape of the spectroscope.

Description

Technical Field

[0001] The present 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 fields such as Earth remote sensing, astronomical observation, medical imaging, and scientific research. The semi-transmissive, semi-reflective function of a spectroscope allows detectors with different response wavelengths to be placed at different locations in space, enabling multi-band detector fusion imaging. Currently, the integrated structures of single-chip spectroscopes are mainly divided into clamping structures, adhesive structures, and support structures.

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

[0004] Chinese invention application CN112285861A discloses a stress-free bonding method for a dual-band spectrometer made of zinc sulfide. This technical solution fixes the spectrometer by glue injection. This fixing method has difficulties in stress control at low temperatures. In addition, it is difficult to disassemble and adjust the spectrometer 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 that solves the problems in the prior art of being prone to deformation, difficult to disassemble, only being able to be temporarily fixed, and being 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 includes a spectroscope mounting frame, a spectroscope, a flexible thermal 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-type structure, provided with an outer frame and a second light-through hole, and is adapted to the spectroscope mounting frame.

[0008] A flexible thermal pad is also provided 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 provided 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. 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 components.

[0010] The beam splitter mounting frame and the cover 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 adapted to the spectroscope mounting frame, and is provided with a thermal pad outer frame and a third light-through hole. 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 beamsplitter mounting frame and cover are made of an alloy material with a low-reflectivity black nickel plating treatment.

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

[0016] Screw holes are provided 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 hole, the second light hole and the third light hole.

[0018] The spectroscope is made of germanium.

[0019] The beam splitter is mounted on the mounting groove using low-temperature epoxy glue; a flexible thermal pad is covered on the surface of the beam splitter and the beam splitter mounting frame, and the first light hole and the third light hole are aligned; the second light hole and the third light hole of the cover plate are aligned, 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 are both made of low-expansion alloy material, 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 structural schematic diagram of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the spectroscope mounting frame of the present invention;

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

[0025] To more concisely illustrate this embodiment, some components well known to those skilled in the art but not relevant to the main content of this invention may be omitted from the drawings or descriptions. In addition, for ease of description, some components may be omitted, enlarged, or reduced in size in the drawings, but they do not represent the dimensions or entire structure of the actual product.

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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 making creative efforts should fall within the scope of protection of the present invention.

[0027] The present invention will be further described below with reference to the accompanying drawings, which are for illustrative purposes only and are not to be construed as limiting the present invention.

[0028] The present invention will now be further described with reference to the embodiments and 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 spectrometer mounting frame 1, a spectrometer 2, a flexible thermal pad 3, and a cover plate 4; the spectrometer mounting frame 1 is provided with a frame 11 and a first light hole 12, the frame 11 is provided with a mounting groove 13, and the edge of the spectrometer 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 to a+0.1 mm, the width or minor axis is b to b+0.1 mm, the depth of the mounting groove 13 is c to c-0.02 mm, 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 spectroscope mounting frame 1 .

[0031] like Figure 1As shown, a flexible thermal pad 3 is further provided between the spectroscope mounting frame 1 and the cover plate 4; the flexible thermal pad 3 is a frame-type thin sheet structure, the spectroscope 2 is provided 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 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 hole 12 , the second light hole 42 and the third light 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 spectrometer 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 spectrometer 2 and the spectrometer mounting frame 1.

[0036] 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.

[0037] In a preferred embodiment, the beam splitter 2 is made of germanium, has a size of a rectangle of 50 mm x 40 mm x 3 mm, has a single side of 1.3 ± 0.05 mm on the surface of the beam splitter 2 without coating, and has a perpendicularity tolerance between the side and the surface of the beam splitter better than 0.02 mm; the beam splitter mounting frame 1 and the cover plate 4 are made of Invar alloy with a low expansion coefficient; and the flexible thermal pad 3 is made of a 0.1 mm thick indium sheet with high thermal conductivity and low temperature resistance.

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

[0039] The flexible thermal pad 3 is a frame-type thin film structure. The length of the flexible third light hole 32 is 49.0~49.2mm, and the width is 39.0~39.2mm. The edge of the flexible thermal pad 3 is provided with screw holes corresponding to the position of the spectrometer 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 48.5~48.6mm, and the width is 38.5~38.6mm; low-stress chemical etching is used, and the edge of the cover plate 4 is provided with screw holes corresponding to the position of the spectrometer mounting frame 1, and then a low-temperature stabilization treatment is performed, and the cover plate 4 is subjected to low-reflectivity black nickel plating.

[0041] The beam splitter 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 beam splitter 2 and the beam splitter mounting frame 1, and the first light hole 12 and the third light hole 32 are aligned; the second light hole 42 of the cover plate 4 is aligned with the third light 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 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 of the present invention should fall within the technical scope of the present invention.

Claims

1. A spectroscope fixing assembly for low temperature applications, characterized by: The invention comprises a spectrometer mounting frame (1), a spectrometer (2), a flexible heat-conducting pad (3), and a cover plate (4); the spectrometer 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 spectrometer (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 spectrometer mounting frame (1); A flexible thermal pad (3) is further provided between the spectroscope mounting frame (1) and the cover plate (4); the flexible thermal pad (3) is a frame-type thin sheet structure, the spectroscope (2) is provided between the flexible thermal pad (3) and the spectroscope 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), and 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, wherein: The flexible thermal pad (3) is adapted in shape 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).

3. The spectroscope fixing assembly for low temperature applications according to claim 1, wherein: The flexible heat-conducting pad (3) is made of an indium sheet.

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

5. The spectroscope fixing assembly for cryogenic applications according to claim 1, wherein: The spectroscope 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 spectroscope mounting frame (1) and the cover plate (4) are made of an alloy material subjected to a low-reflectivity black nickel plating treatment.

7. The spectroscope fixing assembly for low temperature applications according to claim 2, characterized in that: Screw holes are provided at corresponding positions on 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 spectroscope mounting frame (1), the spectroscope (2), the flexible thermal pad (3), and the cover plate (4).

8. The spectroscope fixing assembly for low temperature applications according to claim 2, wherein: 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 spectroscope (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 spectrometer (2) is mounted on the mounting groove (13) using low-temperature epoxy glue; a 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.

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