Oscillating Superleak Second Sound Transducers

The construction and performance of mechanical transducers suitable for generating and detecting second sound in pure 4He, and also in dilute 3He–4He mixtures at millidegree temperatures, are described. It is shown that when the normal fluid density is small, the behavior of the transducers can be e...

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Bibliographic Details
Published in:Review of scientific instruments 1970-11, Vol.41 (11), p.1603-1609
Main Authors: Sherlock, R. A., Edwards, D. O.
Format: Article
Language:English
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Summary:The construction and performance of mechanical transducers suitable for generating and detecting second sound in pure 4He, and also in dilute 3He–4He mixtures at millidegree temperatures, are described. It is shown that when the normal fluid density is small, the behavior of the transducers can be explained by a simple acoustical model which enables their sensitivity, frequency response, and reflection coefficient to be calculated in terms of easily measured parameters.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1684354