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Method for testing surface shape of reflector in zero gravity state

A test method and mirror technology, which are applied to measurement devices, instruments, optical devices, etc., can solve the problems of limited test accuracy, low zero-gravity surface test accuracy, and large residual error in mechanical calculation, and achieve the test principle and data. The processing process is simple, the test error is reduced, and the effect of avoiding gross errors

Active Publication Date: 2013-10-09
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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AI Technical Summary

Problems solved by technology

It can be seen from the test methods that the shortcomings of these methods are that the test accuracy is limited by the unloading structure, and the design of the unloading structure depends on mechanical calculations, and the residual error of mechanical calculations is large, so the accuracy of zero-gravity surface shape testing is low.

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  • Method for testing surface shape of reflector in zero gravity state
  • Method for testing surface shape of reflector in zero gravity state
  • Method for testing surface shape of reflector in zero gravity state

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Embodiment Construction

[0020] The flow process of the inventive method is as figure 1 As shown, the test principle is as follows figure 2 shown. The invention keeps the supporting state of the reflector consistent, conducts surface shape tests in different gravity directions, obtains the change in the surface shape law of the superposition of the gravity support deformation and the zero gravity surface shape, obtains the support deformation through data processing and decomposition, and then obtains the zero gravity surface of the reflector shape. The specific method flow is as follows:

[0021] (1) Set up the interferometer 1, mirror 2, and mirror support device 3, and establish the optical path for interference testing. During the erection process, the positional relationship between the three can meet the general requirements of the surface shape test, and there is no special requirement. The mirror support device 3 requires high stability, which is beneficial to the rotation of the mirror. ...

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Abstract

The invention discloses a method for testing the surface shape of a reflector in a zero gravity state. By means of the characteristic that supporting deformation does not change in a mirror plane rotation test, a solution formula of the supporting deformation is obtained through derivation according to the differential integration principle; a surface shape test sequence is obtained through multiple tests of different directions of mirror plane rotation, and then a conventional data processing method is used for obtaining accurate zero gravity deformation. According to the method, the testing principle and the data processing process are simple, simulation analysis and error calculation are not included, and the test precision is high; the objective testing principle and data processing method are adopted, so that the requirement of space application for reliability is met; the requirement for the supporting deformation is low, and the development cost for a supporting unloading mechanism is low.

Description

technical field [0001] The invention belongs to the technical field of optical precision measurement, and relates to a method for testing the surface shape of a reflecting mirror, which can be used for obtaining the zero-gravity surface shape of the reflecting mirror in the process of processing and detecting the reflecting mirror of a space telescope. Background technique [0002] Space telescopes need to be processed and tested in a gravity environment on the ground, while the working environment in orbit is a microgravity environment. How to accurately detect the gravity-free surface shape of the mirror in a gravity environment is a difficult problem in space mirror testing. [0003] Aiming at the problem of non-gravity testing of reflectors, domestic scholars have proposed an unloading method, which uses a special support structure to unload its gravity, strictly controls the deformation of the reflector introduced by the support force, and meets the requirements of high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/20G01B11/24
Inventor 王昀廖志波
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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