Theoretical and experimental analysis of Dewar thermal properties

D. Willems; S. Garcia; R. Arts; K. Ligtenberg; C. Vasse

doi:10.1117/12.2518897

7 May 2019 Theoretical and experimental analysis of Dewar thermal properties

D. Willems, S. Garcia, R. Arts, K. Ligtenberg, C. Vasse

Proceedings Volume 11002, Infrared Technology and Applications XLV; 1100208 (2019) https://doi.org/10.1117/12.2518897
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

With miniature high operating temperature cryocoolers becoming commonplace, there is an increasing importance of accurate determination of the thermal properties of infrared dewars such as heat load and thermal mass, as well as an increasing challenge to obtaining these properties. Especially in the case where operating temperature in the application is far from liquid nitrogen temperature, such as with HOT detectors, the use of the various known methods should be carefully evaluated. Inconsistencies in results between the various available methods, such as nitrogen boil-off, multi-slope warm-up calorimetry, and theoretical thermal modelling will be discussed, and the work being done at Thales Cryogenics to resolve these inconsistencies is presented.

Conference Presentation

Citation Download Citation

D. Willems, S. Garcia, R. Arts, K. Ligtenberg, and C. Vasse "Theoretical and experimental analysis of Dewar thermal properties", Proc. SPIE 11002, Infrared Technology and Applications XLV, 1100208 (7 May 2019); https://doi.org/10.1117/12.2518897

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