Variable path cryogenic acoustic interferometer

D. M. Kucera*, J. B. Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We describe a variable path acoustic interferometer for use at cryogenic temperatures. Movement is enabled without mechanical coupling via two piezoelectric bimorphs wired and mounted in a manner that preserves the parallelism of two ultrasonic transducers that define the acoustic path. A certain degree of in situ alignment can also be accomplished. Path length sweeps from 0 to 180 μm have been made at cryogenic temperatures and preliminary sound velocity measurements in liquid 4He and gaseous 3He near 4 K are presented which agree well with past measurements.

Original languageEnglish (US)
Pages (from-to)4156-4159
Number of pages4
JournalReview of Scientific Instruments
Issue number12
StatePublished - Dec 1998

ASJC Scopus subject areas

  • Instrumentation


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