Development of a Miniature Co-axial Pulse Tube Refrigerator for Infrared Detector Application

摘要

For the purpose of cooling space-borne infrared detectors, a high frequency miniature pulse tube refrigerator (PTR) has been developing in our laboratory. The 1.06cc linear compressor made by our laboratory is used to generate the pressure waves. In order to be conveniently used, the pulse tube refrigerator has been adopted the multi-bypass, co-axial and symmetry spray nozzle phase shifter structure. The cold finger of the refrigerator is only 72mm long with outer diameter 9mm. This paper also presents he recently experimental result. When the hot end of the refrigerator, cooled by air, is kept at 293K, and the input power of the motor is 30.5W, the minimum temperature of the refrigerator is 70.5K and the cooling power is 185mW at 80K and 280mW at 85K. If the hot end is cooled to 281K by water, the minimum temperature can be 61K and the cooling power is 350mW at 80K. Up to now, the life test of the cooler has been lasting for more than 1100 hours. In the experiment, the room temperature is kept at 300 ± 2K, the humidity is about 60%, and the minimum cold end temperature is generally within the range of 75.4 ± 0.5K, the total apparent cooler power consumption varied between 31.4W and 31.8W.