Assembly and integration testing method for cryogenic optics infrared camera

Chong Lv; Yue Xiao; Pei Li; Zhifeng Bian; Liqing Yue

doi:10.1117/12.3047716

13 November 2024 Assembly and integration testing method for cryogenic optics infrared camera

Chong Lv, Yue Xiao, Pei Li, Zhifeng Bian, Liqing Yue

Author Affiliations +

Proceedings Volume 13280, Advanced Optical Manufacturing Technologies and Applications 2024; and Fourth International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2024); 132800U (2024) https://doi.org/10.1117/12.3047716
Event: Second Conference on Advanced Optical Manufacturing Technologies and Applications & Fourth Forum of Young Scientists on Advanced Optical Manufacturing, 2024, Xi'an, China

Abstract

Cryogenic optical technology aimed at reducing background radiation is the main way to improve the infrared detection capability of space cameras. This paper elaborates on the method of assembly and testing for a cryogenic optics infrared camera with full optical path cooling from the perspective of engineering applications, providing a certain reference for the development of other cryogenic optical cameras. An elastic support framing method for ZnSe lens is proposed, by matching the stiffness of the elastic support structure, and using the rod tooling to accurately and quantitatively compress the spring, the lens meets the requirements of the mechanical environment. The RMS change of the surface accuracy from room temperature to 90K is less than 0.02λ, and the effectiveness of the framing method is verified by experiments. The assembly method of thermal conductive components was optimized. By comparing the working temperature and contact heat transfer coefficient of different interface thermal conductive fillers, indium foil was selected as the optimal interface material. Through simulation analysis of interface contact pressure, the optimal mechanical connection method was formulated. The installation method of multilayer insulation are improved. By staggered lapping, reserving low temperature shrinkage allowance, increasing the multi-layer interval, the thermal insulation effect of MLI has been significantly improved. By using the method of presetting the focal plane at room temperature and conducting over focusing tests under low temperature conditions, the optimal focal plane position is determined to ensure that the camera MTF and energy concentration meet the requirements.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Chong Lv, Yue Xiao, Pei Li, Zhifeng Bian, and Liqing Yue "Assembly and integration testing method for cryogenic optics infrared camera", Proc. SPIE 13280, Advanced Optical Manufacturing Technologies and Applications 2024; and Fourth International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2024), 132800U (13 November 2024); https://doi.org/10.1117/12.3047716

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KEYWORDS

Cameras

Optical fabrication

Infrared cameras

Cryogenics

Thermal effects

Optical testing

Process control

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