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A camera adopts an imaging optical path composed of a four-mirror off-axis reflective mirror group, a room temperature relay lens group, and a cryogenic optical lens group. It requires that the front optical path be at a temperature level of 18 ℃ and the cryogenic lens be at a temperature level of 200 K. This article designs a feasible thermal control scheme for this system, ensuring room temperature optics through two-level control; achieving the temperature control goal of cryogenic optics through mechanical refrigerators with indirect radiation temperature control, enhanced thermal insulation, and semi-quantitative heat transfer control. Thermal balance tests and in-orbit flight temperature data show that the room temperature optical temperature fluctuation is less than 0.5 ℃, the cryogenic optical three-lens temperature is 198.5 K ~ 201.5 K, and the single lens temperature fluctuation is less than 0.2 ℃, achieving better temperature control than the required specifications. At the same time, it can be seen that the mechanical refrigerator has high stability when ensuring the cryogenic optical temperature, which has good application prospects in the cryogenic optics of space infrared cameras.

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Thermal Design and Verification of Optical Path with Coexistence of Room and Cryogenic Temperatures

  • 会议论文

  • 发表日期：

    2025年

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  • Changchun Gao,
  • Zhenjiang Cong,
  • Qingliang Meng,
  • Tao Yang,
  • Guanglang Wei

摘要

A camera adopts an imaging optical path composed of a four-mirror off-axis reflective mirror group, a room temperature relay lens group, and a cryogenic optical lens group. It requires that the front optical path be at a temperature level of 18 ℃ and the cryogenic lens be at a temperature level of 200 K. This article designs a feasible thermal control scheme for this system, ensuring room temperature optics through two-level control; achieving the temperature control goal of cryogenic optics through mechanical refrigerators with indirect radiation temperature control, enhanced thermal insulation, and semi-quantitative heat transfer control. Thermal balance tests and in-orbit flight temperature data show that the room temperature optical temperature fluctuation is less than 0.5 ℃, the cryogenic optical three-lens temperature is 198.5 K ~ 201.5 K, and the single lens temperature fluctuation is less than 0.2 ℃, achieving better temperature control than the required specifications. At the same time, it can be seen that the mechanical refrigerator has high stability when ensuring the cryogenic optical temperature, which has good application prospects in the cryogenic optics of space infrared cameras.