Piezospectroscopic measurement of high-frequency vibrations in a
pulse-tube cryostat
release_4m7peqs5yvbtzka6eeg4jwyxcy
by
Anne Louchet-Chauvet, Rose Ahlefeldt, Thierry Chanelière
2018
Abstract
Vibrations in cryocoolers are a recurrent concern to the end user. They
appear in different parts of the acoustic spectrum depending on the
refrigerator type, Gifford McMahon or pulse-tube, and with a variable coupling
strength to the physical system under interest. Here, we use the
piezospectroscopic effect in rare-earth doped crystals at low temperature as a
high resolution, contact-less probe for the vibrations. With this optical
spectroscopic technique, we obtain and analyze the vibration spectrum up to
700kHz of a 2kW pulse-tube cooler. We attempt an absolute calibration based on
known experimental parameters to make our method partially quantitative and to
provide a possible comparison with other well-established techniques.
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