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Opposed piston linear compressor driven two-stage Stirling Cryocooler for cooling of IR sensors in space application |
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| Affiliation: | 1. Jaywantrao Sawant College of Engineering, Pune, Maharashtra, India;2. MIT College of Engineering, Pune, Maharashtra, India;3. VJTI, Matunga, Mumbai, India;4. Indian Institute of Technology, Bombay, Mumbai, India;5. MGM CET, Navi Mumbai, India;1. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, China;2. University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China;1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China;2. Key Lab. of Ref. & Cryo. Technology of Zhejiang Province, Hangzhou 310027, China;3. TransMIT-Centre of Adaptive Cryotechnology and Sensors, D-35392 Giessen, Germany;4. Institute of Applied Physics, University of Giessen, D-35392 Giessen, Germany;1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China;2. Key Lab. of Ref. & Cryo. Technology of Zhejiang Province, Hangzhou 310027, China;3. TransMIT - Centre of Adaptive Cryotechnology and Sensors, D-35392 Giessen, Germany;4. Institute of Applied Physics, University of Giessen, D-35392 Giessen, Germany;1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
| Abstract: | A two-stage Stirling Cryocooler has been developed and tested for cooling IR sensors in space application. The concept uses an opposed piston linear compressor to drive the two-stage Stirling expander. The configuration used a moving coil linear motor for the compressor as well as for the expander unit. Electrical phase difference of 80 degrees was maintained between the voltage waveforms supplied to the compressor motor and expander motor. The piston and displacer surface were coated with Rulon an anti-friction material to ensure oil less operation of the unit. The present article discusses analysis results, features of the cryocooler and experimental tests conducted on the developed unit. The two-stages of Cryo-cylinder and the expander units were manufactured from a single piece to ensure precise alignment between the two-stages. Flexure bearings were used to suspend the piston and displacer about its mean position. The objective of the work was to develop a two-stage Stirling cryocooler with 2 W at 120 K and 0.5 W at 60 K cooling capacity for the two-stages and input power of less than 120 W. The Cryocooler achieved a minimum temperature of 40.7 K at stage 2. |
| Keywords: | Cryocooler Two-stage Stirling Cycle Opposed piston linear compressor Flexure bearing |
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