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Method for generating primary mirror shape of long-wave infrared inflatable thin-film mirror

A thin-film mirror and long-wave infrared technology, applied in the optical field, can solve the problems of difficult to guarantee optical imaging requirements, cumbersome thin-film surface manufacturing process, difficult thin-film and other problems, and achieve the effects of easy large-scale promotion, low cost and simple process

Active Publication Date: 2016-02-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, inflatable film mirrors are mainly used in fields such as space antennas and solar panels, because it is difficult to manufacture films that meet optical imaging requirements
Research institutes at home and abroad have conducted a large number of scientific experiments in the field of polyimide films, proving that inflatable film mirrors can be applied to optical imaging, but the manufacturing process of film surface forming is cumbersome and difficult to implement
[0006] Inflatable film mirrors have many advantages as the main mirror of large-aperture space telescopes, but the surface shape obtained after inflating is difficult to meet the requirements of optical imaging, and the preparation of films that meet the requirements of optical imaging has become an important problem facing inflatable mirrors.

Method used

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  • Method for generating primary mirror shape of long-wave infrared inflatable thin-film mirror
  • Method for generating primary mirror shape of long-wave infrared inflatable thin-film mirror
  • Method for generating primary mirror shape of long-wave infrared inflatable thin-film mirror

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specific Embodiment approach 1

[0021] Specific implementation one: as Figure 1-2 As shown, the long-wave infrared inflatable film reflector in this embodiment includes a polyimide film 1, a sealing ring 2, an inflatable device 3, an aluminum film 6, a copper film 7, a barometer 8, a valve 9, and a U-shaped tube. 10. Inflator 11.

[0022] The inflatable film mirror is composed of two layers of polyimide film 1, the first polyimide film layer 4 is transparent, this film is the first main reflection surface of the main mirror of the optical system, and serves as the reflection of the incident beam. Incident window; the second polyimide film layer 5 is a reflective surface, the surface of this film layer is the main reflective surface of the main mirror, and this reflective surface is a concave surface, the front surface is coated with an aluminum film of uniform thickness, and the rear surface is Copper plated film 7.

[0023] like figure 1 As shown, the left side of the polyimide film 1 is the first polyi...

specific Embodiment approach 2

[0032] Specific implementation two: as image 3 As shown, the difference between this embodiment and the specific embodiment 1 is that the method for generating the surface shape of the parabolic surface of the primary mirror of the gas-filled film mirror (ie the second polyimide film layer) is:

[0033] Step 1: Fix the polyimide film on the clamp of the film flattening device for pre-tightening, and adjust the film on the clamp to make it toughened.

[0034] Step 2: Divide the flattened film into 10 rings of equal size, and design an annular shielding mask plate correspondingly to shield the layered coating.

[0035] Step 3. Calculate the thickness of the film layer theoretically in advance according to the surface shape requirements. The thickness of each annular band of the copper film follows the equation satisfied by the Henky-curve curve:

[0036] i.e. Z Henky =-0.899×w(0)(u 2 -0.871u 4 ), where u=2x / D, x is the radial distance from the center of the film to any posi...

specific Embodiment approach 3

[0047] Embodiment 3: The difference between this embodiment and Embodiment 2 is that: during coating, the layered coating ring belt of the thin film layer is not limited to 10 rings, and the more ring belts, the higher the precision.

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Abstract

A long-wave infrared and inflated film reflecting mirror and a formation method of the main mirror surface belong to the technical field of optics. The film reflecting mirror is composed of a first polyimide thin film layer and a second polyimide thin film layer, which are in sealed connection with each other through a seal ring; an inflation hole is formed in the seal ring; the inflation hole is connected with an inflation device through an inflation pipe; the first polyimide thin film layer is transparent; the second polyimide thin film layer, of which one surface adjacent to the first polyimide thin film layer is coated with aluminium and the other surface is coated with copper, serves as a working reflection surface. The long-wave infrared and inflated film reflecting mirror can be used for optical imaging; when being used as a system main mirror, the long-wave infrared and inflated film mirror has the advantages of simple structure, low mass, and low manufacturing cost, thereby being suitable for a large-caliber optical system; the long-wave infrared and inflated film mirror realizes the effect that the thin film mirror has a reflection surface with the surface shape approximate to that of a paraboloid; the method has a simple technology, is easy to realize and popularize in large scale, and can produce reflection surface with relative high accuracy.

Description

technical field [0001] The invention belongs to the technical field of optics, and relates to an inflatable thin film mirror used as a large-diameter space telescope system and a method for generating the main mirror surface shape thereof. Background technique [0002] With the development of aerospace technology, the requirements for optical mirrors are getting higher and higher, and low cost, high resolution, light weight, and easy portability have become important technical indicators. Constrained by the weight of the mirror body, the traditional reflector is difficult to meet the requirements of large aperture, which makes it difficult to improve the imaging resolution, and its portability is poor as the aperture increases, which does not meet the requirements of the launch vehicle carrying space. [0003] At present, the main method to solve the requirements of large aperture in space is aperture splicing technology, that is, using small-sized mirrors to synthesize larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/08G02B1/10G02B1/11
Inventor 张树青谭双龙王治乐王敬洋
Owner HARBIN INST OF TECH