Method for testing influence of self weight to surface shape of off-axis reflection mirror

Abstract

The invention relates to a method for testing the influence of self weight to the surface shape of an off-axis reflection mirror, belonging to the field of spaceflight. The method comprises the following steps: measuring the surface shape data and off-axis amount of a reflection mirror assembly in a state of 0 degree; measuring the surface shape data and off-axis amount of the reflection mirror assembly in a state of 180 degrees; determining the relationship between a mirror surface astigmatism variation and an off-axis amount variation by a test under the condition that the reflection mirror assembly is in the state of 0 degree, and determining the mirror surface astigmatism variations corresponding to the two off-axis amount variations in the states of 0 degree and 180 degrees by a linear interpolation method; adopting an error combination principle to obtain the influence of the self-weight load to the surface shape of the reflection mirror according to the test results of the surface shape of the reflection mirror in the states of 0 degree and 180 degrees as well as the mirror surface astigmatism variations corresponding to the two off-axis amount variations in the states of 0 degree and 180 degrees. In the two states, the gravities of the reflection mirror assembly are equal, and the directions of the gravities are opposite to each other; after the test is carried out, the influence of two times of self-weight load to the surface shape of the reflection mirror can be obtained, namely that half of the test result is the change of the surface shape of the mirror caused by the 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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