Research on Stirling Cooler for High Operation Temperature Infrared Detector
Stirling cooler is the main cooling source for high operation temperature infrared detec-tor.In recent years,with the continuous development of infrared detection technology,the cooling temperature of Stirling cooler is expected to be further increased,which brings the possibility to improve the efficiency and compactness of the Stirling cooler and reduce its weight.The decrease of the temperature ratio and the existence of the displacer of the Stirling cooler make the impedance phase around the compressor piston close to 90°,and the impedance matching between the com-pressor and the cold finger becomes more difficult.At present,there is a lack of in-depth research on the micro Stirling cooler at temperature zone above 160 K.In order to meet the requirements of the infrared detector on the compactness and high efficiency of the cooler in the high operation temperature region,the impedance matching characteristics of a minor Stirling cooler with a cooling temperature of 220 K are studied,the diameter of compressor piston is increased from 8.5 mm to 10.5 mm.The structural and operating parameters are optimized on this basis.When the ambient temperature changes within-20～60℃,the power consumption of the compressor is less than 8 W to obtain the cooling power of 2 W@220 K.The relative Carnot efficiency reaches 10.4％and 12.4％at 25℃ and 60℃,respectively.
Stirling coolerimpedance matchinfrared detectorhigh operation temperature
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