Piezospectroscopic measurement of high-frequency vibrations in a pulse-tube cryostat

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 piezospectroscop...

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Bibliographic Details
Published in:Review of scientific instruments 2019-03, Vol.90 (3), p.034901-034901
Main Authors: Louchet-Chauvet, Anne, Ahlefeldt, Rose, Chanelière, Thierry
Format: Article
Language:English
Subjects:
Atomic Physics
Doped crystals
Instrumentation and Detectors
Physics
Pulse tubes
Rare earth elements
Scientific apparatus & instruments
Vibration analysis
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Summary: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 a 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 700 kHz of a 2 kW 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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5080086