Non-Contact Measurement of Displacer Motion of a Miniature Split Stirling Cryocooler
Journal
Measurement
Journal Volume
14
Journal Issue
3-4
Pages
199-208
Date Issued
1995
Date
1995
Author(s)
Abstract
A relative displacement measurement method is originally proposed to calibrate the static sensitivity of the measurement of displacer motion inside the cold finger of a split-type Stirling cryocooler. This measurement is non-contact and non-destructive by the use of the well-known linear variable-differential transformer (LVDT). Therefore the cooler operates in normal conditions without any interference, such as loading effects, from the measurement. The true displacement of the displacer is the product of the output voltage from the LVDT and the calibrated static sensitivity. Since the displacer motion consists of multiple sinusoidal signals and its oscillation center drifts continuously, modifications are made to get a better estimation of the static sensitivity. Both the direct fitting method and the small drift modification method are investigated through computer simulations, and are used successfully in experiments on a Hughes 7013H cooler. © 1995.
SDGs
Type
journal article
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