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Lifei Tang

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Proceedings Article | 18 December 2023 Paper

Temperature characteristics of infrared cryogenic camera lens

Zhaoli Wang, Houlei Chen, Lifei Tang, Weiwen Zhou

Proceedings Volume 12960, 129600J (2023) https://doi.org/10.1117/12.3007794

KEYWORDS: Cryocoolers, Temperature control, Cryogenics, Infrared cameras, Infrared detectors, Lenses

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Thermal radiation of the normal temperature optical system coinciding with the target radiation spectrum is the main background noise source for long-distance infrared detection of weak targets. It will reduce the detection sensitivity and detection distance of the system and increase the difficulty of target detection and recognition. Reducing the temperature of the optical system is the most direct and effective way to reduce its own radiation, which can reduce the background noise of the system. The cooling time and temperature characteristics of the lens under different optical-mechanical structures are simulated. The simulation results show that the cryogenic lens assembly with copper material optical-mechanical structure has a heat leakage of 0.2W at 180K, and the temperature difference between the center points of the two lenses is 0.8K. A miniaturized ultra-high frequency pulse tube cryocooler is used as a cold source to cool the lens assembly of 30 g optical-mechanical thermal mass. The temperature characteristics of the lens under different input power of the cryocooler are tested. By optimizing the temperature control strategy, the lens temperature can be stabilized at 180 K in 15 minutes, the temperature fluctuation is ± 0.2K, and the temperature difference between the two lenses is less than 1K, which is a useful exploration for the infrared detection system directly integrated with cryogenic optics.

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