Joule-Thomson micro cryogenic coolers (MCCs) are a preferred approach for small and low power cryocoolers. With the same heat lift, MCCs power input can be only 1/10 of a thermoelectric coolers input, and MCCs size can be only 1/10 of a Stirling coolers size. With futuristic planar MCC and with high frequency MEMS compressors to be developed, its size can be reduced another order of magnitude. Such invisible cryocoolers may revolutionize future IR imaging systems. We will review our studies on the feasibility of MCC with an emphasis on: 1) high thermal isolation levels reaching 89,000 K/W; 2) custom-designed gas mixtures with refrigeration capabilities increased by 10X and pressure ratio reduced to only 4:1; 3) compressors with low pressure ratios; and 4) excellent scalability for further size reduction.
Proceedings Title: SPIE 2011 Defense, Security, and Sensing Conference
Conference Dates: April 25-29, 2011
Conference Location: Orlando, FL
Pub Type: Conferences
Cryocooler, Cryogenic, Joule-Thomson, Packaging, MEMS, IR Imaging, Thermoelectric, Stirling, Cooler