Abstract
A closed-cycle Joule–Thomson cryocooler for resistance thermometer calibration has been developed. It consists of a Gifford–McMahon mechanical refrigerator and a closed-cycle 3He Joule–Thomson expansion circuit that utilizes the isenthalpic expansion of 3He for cooling. The developed cryocooler can reach temperatures as low as 0.6K and can operate for months with a simple procedure. The typical cooling power of the cryocooler is 1mW at 0.65K with a molar flow rate of 160μmol ·s−1 through the 3He Joule–Thomson circuit. The possible mechanical vibration level experienced by the resistance thermometers was measured with a laser vibrometer. It was confirmed that the maximum acceleration level is 0.1m· s−2 and will not cause a problem for thermometer calibration.
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Shimazaki, T., Toyoda, K., Oota, A. et al. Closed-Cycle Joule–Thomson Cryocooler for Resistance Thermometer Calibration down to 0.65K. Int J Thermophys 29, 42–50 (2008). https://doi.org/10.1007/s10765-007-0341-5
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DOI: https://doi.org/10.1007/s10765-007-0341-5