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For capturing high-quality images from space, infrared sensors are used. It is necessary to keep these sensors at cryogenic temperatures. Development and testing of a single-stage Stirling cryocooler was done to serve the purpose. The cryocooler consists of opposed piston linear compressor and expander unit. The expander and compressor assembly is split type so that the vibration of the opposed piston does not reach the expander unit. The piston of the compressor and expander unit is driven by moving coil linear motors. To maintain an electrical phase between the voltage waveforms supplied to the compressor motor and expander motor, a custom-made power supply was used. It maintains a phase difference of 180° which gives the optimum results. The outer surfaces of pistons were coated with rulon material for oil-less operation. The free pistons of both the unit were supported by a stack of flexure bearings. In this article, dimensions obtained from thermal analysis and experimental results conducted on the developed unit were discussed. The developed cryocooler achieved a no-load temperature (without connecting heater at cold tip) of 40 K.

40 K single-stage split-type Stirling cryocooler