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An Experimental Study on the Cooling Characteristics of an Infrared Detector Cryochamber  

Kang Byung Ha (School of Mechanical & Automotive Engineering, Kookmin University)
Lee Jung Hoon (Graduate School, Kookmin University)
Kim Ho-Young (Thermal/Flow Control Research Center, KIST)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.16, no.10, 2004 , pp. 889-894 More about this Journal
Abstract
Infrared (IR) detectors are widely used for many applications, such as temperature measurement, intruder and fire detection, robotics and industrial equipment, thermoelstic stress analysis, medical diagnostics, and chemical analysis. Quantum detectors commonly need to be refrigerated below 80 K, and thus a cooling system should be equipped together with the detector system. The cooling load, which should be removed by the cooling system to maintain the nominal operating temperature of the detector, critically depends on the insulation efficiency of the cryochamber housing the detector. Thermal analysis of cryochamber includes the conduction heat transfer through a cold well, the gases conduction and gas outgassing, as well as radiation heat transfer, The transient cooling characteristics of an infrared detector cryochamber are investigated experimentally in the present study. The transient cooling load increases as the gas pressure is increased. Gas pressure becomes significant as the cooling process proceeds. Cool down time is also increased as the gas pressure is increased. It is also found that natural convection effects on cool down time become significant when the gas pressure is increased.
Keywords
Cryochamber; IR sensor; Transient heat transfer; Cool down time;
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