Optimum charging pressure and operating frequency in the Stirling Cryocooler

KIMM, Wooyoung^A

@S.J.Park, Y.J.Hong, H.B.Kim, D.Y.Koh, J.H.Kim^A, B.K.Yu^A

　 This paper presents manufacturing process and test results in the optimum pressure and operating frequency for the free piston free displacer (FPFD) Stirling cryocooler designed and manufactured by Korea Institute of Machinery & Materials (KIMM) . FPFD Stirling cryocooler is currently under development for cooling infrared detector. The compressor uses opposed linear motors to drive opposed pistons. The performance of FPFD Stirling cryocooler is evaluated as a function of charging pressure and operating frequency. In general, as the charging pressure is increased, optium operating frequency of the compressor is increased but natural frequency of the displacer is almost constant. The prototype has achieved no load temperature of 49K and cooling power of 0.5W at 72K.