High-resolution acoustic measurements by path length modulation

P. J. Hamot; H. H. Hensley; Y. Lee; W. P. Halperin

doi:10.1016/S0921-4526(90)80913-4

High-resolution acoustic measurements by path length modulation

P. J. Hamot^*, H. H. Hensley, Y. Lee, W. P. Halperin

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

An acoustic technique is described which permits precise measurement of phase velocity in liquids or gases with high attenuation ( α >10 cm^-1) utilizing a thin, variable path length acoustic cavity formed by a quartz transducer and a piezoelectric bimorph. The path length can be changed manually or in feedback where the bimorph motion is driven by the output of a cw spectrometer. Measurement of phase velocity is then simply measurement of cavity size, which is done capacitively to high precision. The path length modulation method can allow absolute measurement of attenuation as well as resolution of ∼10^-5 in phase velocity with a path length as short as 50μ. It is anticipated that this approach can be used successfully to explore regimes of collective modes and pair breaking in superfluid 3He, as well as textural effects in restricted geometries.

Original language	English (US)
Pages (from-to)	127-128
Number of pages	2
Journal	Physica B: Physics of Condensed Matter
Volume	165-166
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4526(90)80913-4
State	Published - Aug 1990

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/S0921-4526(90)80913-4

Cite this

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title = "High-resolution acoustic measurements by path length modulation",

abstract = "An acoustic technique is described which permits precise measurement of phase velocity in liquids or gases with high attenuation ( α >10 cm-1) utilizing a thin, variable path length acoustic cavity formed by a quartz transducer and a piezoelectric bimorph. The path length can be changed manually or in feedback where the bimorph motion is driven by the output of a cw spectrometer. Measurement of phase velocity is then simply measurement of cavity size, which is done capacitively to high precision. The path length modulation method can allow absolute measurement of attenuation as well as resolution of ∼10-5 in phase velocity with a path length as short as 50μ. It is anticipated that this approach can be used successfully to explore regimes of collective modes and pair breaking in superfluid 3He, as well as textural effects in restricted geometries.",

author = "Hamot, {P. J.} and Hensley, {H. H.} and Y. Lee and Halperin, {W. P.}",

note = "Funding Information: Physics Program of the NSF under contract DMR-8620275.",

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doi = "10.1016/S0921-4526(90)80913-4",

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AU - Hamot, P. J.

AU - Hensley, H. H.

AU - Lee, Y.

AU - Halperin, W. P.

N1 - Funding Information: Physics Program of the NSF under contract DMR-8620275.

PY - 1990/8

Y1 - 1990/8

N2 - An acoustic technique is described which permits precise measurement of phase velocity in liquids or gases with high attenuation ( α >10 cm-1) utilizing a thin, variable path length acoustic cavity formed by a quartz transducer and a piezoelectric bimorph. The path length can be changed manually or in feedback where the bimorph motion is driven by the output of a cw spectrometer. Measurement of phase velocity is then simply measurement of cavity size, which is done capacitively to high precision. The path length modulation method can allow absolute measurement of attenuation as well as resolution of ∼10-5 in phase velocity with a path length as short as 50μ. It is anticipated that this approach can be used successfully to explore regimes of collective modes and pair breaking in superfluid 3He, as well as textural effects in restricted geometries.

AB - An acoustic technique is described which permits precise measurement of phase velocity in liquids or gases with high attenuation ( α >10 cm-1) utilizing a thin, variable path length acoustic cavity formed by a quartz transducer and a piezoelectric bimorph. The path length can be changed manually or in feedback where the bimorph motion is driven by the output of a cw spectrometer. Measurement of phase velocity is then simply measurement of cavity size, which is done capacitively to high precision. The path length modulation method can allow absolute measurement of attenuation as well as resolution of ∼10-5 in phase velocity with a path length as short as 50μ. It is anticipated that this approach can be used successfully to explore regimes of collective modes and pair breaking in superfluid 3He, as well as textural effects in restricted geometries.

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High-resolution acoustic measurements by path length modulation

Abstract

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