Analysis and test of influence of ground force and thermal environment on space reflector

Yuting Lu

doi:10.1117/12.2691676

6 November 2023 Analysis and test of influence of ground force and thermal environment on space reflector

Yuting Lu

Proceedings Volume 12921, Third International Computing Imaging Conference (CITA 2023); 129213W (2023) https://doi.org/10.1117/12.2691676
Event: Third International Computing Imaging Conference (CITA 2023), 2023, Sydney, Australia

Abstract

When the telescopic lens of space camera is installed and adjusted on the ground, the optical transfer function is greatly affected by gravity and thermal environment. The difference between ground and in-orbit gravity and thermal environment makes the mirror deformed, resulting in the change of the mirror position accuracy and surface shape accuracy, resulting in the difference between ground and in-orbit MTF. The variation interval of position accuracy and surface shape accuracy of a certain type of mirror are obtained with the aim of reducing in-orbit MTF by 2%. On this basis, the finite element model of the mirror assembly is established, the changes of the surface shape and displacement of the mirror under gravity and the condition of temperature change is analyzed, which is to determine the changes of shape and position parameters of the mirror in orbit. At the same time, in order to verify the accuracy of the simulation, a special mirror flip support tool is designed and manufactured. Combining with coordinate measuring instrument and optical interferometer to detect the displacement and surface shape changes of mirror at 0° and 180° at different temperatures. After data analysis, the influence of gravity and heat on the mirror is effectively stripped off, and the experimental results are basically consistent with the simulation results. The results show that the simulation method can accurately analyze the gravity and heat change of the optical elements of the remote sensing optical camera after entering the orbit, and the deviation between the analysis results and the test is less than 20%. It can be widely used in the optical structure analysis of other similar remote sensing products.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Yuting Lu "Analysis and test of influence of ground force and thermal environment on space reflector", Proc. SPIE 12921, Third International Computing Imaging Conference (CITA 2023), 129213W (6 November 2023); https://doi.org/10.1117/12.2691676

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KEYWORDS

Mirrors

Mirror surfaces

Temperature metrology

Cameras

Adhesives

Space mirrors

Shape analysis

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