Thermal-structural-optical integrated analysis of low temperature infrared athermal collimation system

Junli Shen; Wenxiong Li; Zhenyu Lu; Shudong Men; Qingwen Wu

doi:10.1117/12.3011096

1 November 2023 Thermal-structural-optical integrated analysis of low temperature infrared athermal collimation system

Junli Shen, Wenxiong Li, Zhenyu Lu, Shudong Men, Qingwen Wu

Proceedings Volume 12917, International Conference on Precision Instruments and Optical Engineering (PIOE 2023); 1291714 (2023) https://doi.org/10.1117/12.3011096
Event: 3rd International Conference on Precision Instruments and Optical Engineering (PIOE 2023), 2023, Shanghai, China

Abstract

To enhance the efficiency of infrared missile development and testing, cryogenic chamber semi-physical simulation was employed for the low-temperature infrared radiation calibration of a seeker. The collimation system, a pivotal subsystem of the cryogenic chamber, is primarily responsible for generating far-field radiation during testing. An off-axis three-mirror collimation system tailored for low-temperature applications is proposed. The entire collimation system employs a SiC athermal structure to enhance its adaptability to low temperatures. The primary mirror of the collimation system undergoes thermal-structural-optical integrated simulation analysis, addressing four key factors: gasket diameter, temperature difference between the mirror and its support, unloading groove, and flexible element. At low temperatures, the surface error of the primary, secondary, and tertiary mirrors is all less than λ/30. The optical system's maximum field of view (1,- 1)RMS at low temperatures is 0.2840λ, while the minimum field of view (-1,1)RMS is 0.1549λ, both satisfying the requirements of the low-temperature collimation system. The adaptability of the collimation system at low temperatures and the feasibility of the athermal structure design are confirmed through thermal-structural-optical integrated simulation analysis.

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

Citation Download Citation

Junli Shen, Wenxiong Li, Zhenyu Lu, Shudong Men, and Qingwen Wu "Thermal-structural-optical integrated analysis of low temperature infrared athermal collimation system", Proc. SPIE 12917, International Conference on Precision Instruments and Optical Engineering (PIOE 2023), 1291714 (1 November 2023); https://doi.org/10.1117/12.3011096

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KEYWORDS

Mirrors

Collimation

Mirror surfaces

Error analysis

Thermography

Infrared radiation

Cryogenics

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