Test method for the effect of self-weight on the surface shape of off-axis mirrors

Abstract

The test method for the influence of self-weight on the surface shape of off-axis mirrors belongs to the aerospace field. The method steps are as follows: measure the surface data and off-axis amount of the mirror assembly under the 0° state; measure the shape data and the off-axis amount of the mirror assembly under the 180° state. Off-axis amount; when the mirror assembly is in the state of 0°, the relationship between the amount of change in mirror astigmatism and the amount of off-axis amount is determined through experiments, and the change in mirror astigmatism corresponding to the amount of off-axis amount in the two states is determined by linear interpolation Quantity; the principle of error synthesis is used to obtain the influence of self-weight load on the surface shape of the mirror according to the test results of the mirror surface shape in the 0° state and the 180° state and the astigmatism change corresponding to the off-axis amount change in the two states. In the state, the gravitational force on the mirror assembly is equal in magnitude and opposite in direction. Through this test, the effect of 2 times the self-weight load on the mirror surface shape is obtained, that is, half of the test result is the mirror surface shape change caused by self-weight.

Description

technical field [0001] The invention belongs to the field of aerospace, and relates to a test method for measuring the surface shape change of a reflector assembly under the action of its own weight. Background technique [0002] The reflectors of space optical remote sensors are processed and detected in the gravity environment of the ground. After entering orbit, the space environment is a microgravity environment. There must be a gravity release process for the reflector components in a microgravity environment. How to accurately predict the reflection The change of the surface shape of the mirror after being released by its own weight is a difficult problem in the surface shape test of the space optical remote sensor mirror. [0003] The influence of the self-weight load on the mirror surface shape is the inverse process of the self-weight release on the mirror surface shape, and the change of the root mean square value of the mirror surface shape caused by the two is th...

AI Technical Summary

Problems solved by technology

[0004] For the test of the influence of self-weight on the surface shape of the reflector, domestic and foreign scholars mostly use the method of simulation analysis to obtain it. However, due to factors such as material parameter errors, structural parameter errors, and connection relationship modeling errors in the simulation analysis, the model has not been corrected. The simulation analysis results usually have large errors. Therefore, it is unreliable to only use the simulation analysis results as the final prediction. It is necessary to carry out relevant experimental research on the influence of self-weight on the surface shape of the mirror.

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