Mr. Marko Cuderman Profile

Marko Cuderman

at Le-Tehnika doo

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Proceedings Article | 7 June 2024 Presentation + Paper

Joule Thomson coolers for HOT IR detectors cooling

Franc Megušar, Marko Cuderman

Proceedings Volume 13046, 130461J (2024) https://doi.org/10.1117/12.3012093

KEYWORDS: Thermal stability, Krypton, Infrared detectors, Argon, Sensors, Missiles, Infrared sensors, Temperature metrology, Temperature sensors, Cryogenics

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The paper presents two approaches to address the possibility of cooling IR detectors with JT coolers which work at temperatures higher than 100K. Considering how to achieve required temperature, the first part of research focuses on finding the proper working gas (or mixture) with liquefaction point in the required temperature range. Results of findings will be presented with focus on gas flow and regulating gas tuning to achieve short cool down times and proper temperature stability. Part of the focus will be on cool down time comparison of such systems toward a classical JT using argon or air in DDA with similar thermal mass. Benefits and drawbacks observed when using such approach will be compared.

The second approach to be presented is the use of unique Actively Controlled JT cooler (ACC) which is capable to work at different IR detector cryostating temperatures above 100K. In addition, challenges which are associated with such approach are presented. Le-tehnika has quite some experience using the ACC at 100K level while levels above 100K still bring significant research challenges regarding the temperature stability on the detector. The paper will describe how we approached these challenges, and cooling results achieved at different temperature levels will be presented. Finally, achieved technology level will be evaluated and some possible improvements will be proposed.

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