Mr. Weiming Tong Profile

Weiming Tong

at Beijing Institute of Space Mechanics & Electricity

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Proceedings Article | 24 November 2021 Paper

Design and experimental study for lens working at both room and low temperature

Weiming Tong, Shaojun Bai, Changchun Gao, Xuemin Zhao

Proceedings Volume 12061, 1206117 (2021) https://doi.org/10.1117/12.2606210

KEYWORDS: Cryogenics, Lens design, Cryocoolers, Wavefronts, Infrared radiation, Structural design, Germanium, Aspheric lenses, Signal to noise ratio, Modulation transfer functions

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By reducing the working temperature of opto-mechanical structures, the infrared system signal to noise ration can be effectively improved. Normally, structures close to the focal plane radiate more noise. Signal to noise ration can be improved by cooling the opto-mechanical in front of the focal plane. In this paper, an infrared lens working at both room and low temperature is designed. The first four lenses work at room temperature and the other three lenses close to the focal plane work at 200K. The cryogenic lens is cooled by space pulse tube cryocooler. UG TMG thermal analysis results show that the working temperature of each lens meets the requirements, and the temperature gradient of each lens is less than 0.2K. Modal analysis results show that the first modal frequency is 97.2Hz. The finite element analysis results show that the maximum stress of the structure is 227.8MPa, which is far less than the allowable stress of TC4. Thermal-structure-optical analysis show that the system MTF has a small decrease from root temperature to working temperature. By adjusting the position of the focal plane, the system MTF can recover to the design results. The results of the vacuum experiment show that the working temperature of the lens is close to the simulation results. The wavefront error is measured both at room temperature and working temperature. The average wavefront error is 0.060λ (λ=632.8nm) at working temperature and 0.070λ at room temperature. Experiment results verify the correctness of the thermal design and opto-mechanical design.

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