New techniques for the non-contact measurement of displacer motion of a miniature split-Stirling cryocooler

This paper proposes optional methods to calibrate the static sensitivity of the measurement of displacer motion inside the cold finger of a split-Stirling cryocooler. The relative displacement measurement method, as previously proposed, required that the regenerator matrix material should have such...

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Bibliographic Details
Published in:Cryogenics (Guildford) 1996, Vol.36 (8), p.573-578
Main Authors: Yang, Y.P., Huang, B.J., Chen, F.M., Chien, S.B., Shieh, T.F.
Format: Article
Language:English
Subjects:
Applied sciences
Calibration
Cryogenics
Cylinders (containers)
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Heat transfer
Magnetic permeability
Refrigerating engineering. Cryogenics. Food conservation
Regenerators
Spatial variables measurement
split-Stirling cryocooler
static sensitivity calibration
Temperature
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Summary:This paper proposes optional methods to calibrate the static sensitivity of the measurement of displacer motion inside the cold finger of a split-Stirling cryocooler. The relative displacement measurement method, as previously proposed, required that the regenerator matrix material should have such a high magnetic permeability that the linear variable-differential transformer (LVDT) could measure the displacer motion without large signal amplification. This would be impossible for low-permeability materials, e.g. stainless steel 316L and 304L, contained in the displacer. Therefore, three options are proposed for the calibration of static sensitivity: contact, purge or dynamic calibration methods. Temperature compensation is also found to be necessary to transfer the LVDT voltage to the true displacer displacement when performing the non-contact measurement of the displacer motion.
ISSN:0011-2275
1879-2235
DOI:10.1016/0011-2275(96)00010-0