Mr. Youdao Gao Profile

Youdao Gao

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Proceedings Article | 5 November 2020 Paper

Multi-fields coupling simulation and verification in cryogenic lens of infrared remote sensor

Youdao Gao, Ji Zhou, Fudong Li, Weidong Lv, Tao Jia

Proceedings Volume 11567, 115672H (2020) https://doi.org/10.1117/12.2579887

KEYWORDS: Cryogenics, Infrared radiation, Infrared sensors, Modulation transfer functions, Thermography, Remote sensing, Infrared lenses, Sensors

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Space cryogenic infrared remote sensor has a wide range of applications, but there are only a few cases which function well in orbits, especially the domestic related research is still in the preliminary stage. Cryogenic lens is installed and adjusted at room temperature. In low temperature environment, the lens structure will produce thermal stress deformation, which will affect the surface shape and focal plane position of the lens, thus affecting the optical imaging quality. Therefore, the design of cryogenic lens must combine the three physical fields of light, machine and heat. This article is based on an infrared cryogenic lens, low temperature 210k working conditions, cryogenic lens finite element model (FEM) is established, using the simulation analysis software to calculate the lens at low temperature for the thermal deformation and thermal stress, the deformation of the mirror node data export for Zernike polynomial fitting, and translated into changes in surface shape and deformation after the modulation transfer function (MTF). After the installation and adjustment, the cryogenic lens was placed in a vacuum tank, and MTF was tested at room temperature and low temperature. The test results showed that the deviation is less than 0.5%, within the acceptable range, indicating that the cryogenic lens multi-field coupling simulation method used in this paper is reliable and has strong engineering significance.

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