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Covert cavitation: Spectral peak suppression in the acoustic emissions from spatially configured nucleations

By Jae Hee Song, Kristoffer Johansen and Paul Prentice

Abstract

Dual laser-nucleation is used to precisely configure two cavitation bubbles within a focused ultrasound field of f0 = 692 kHz, in proximity to the tip of a needle hydrophone. With both bubbles responding in the f0/2 sub-harmonic regime, confirmed via ultra-high speed shadowgraphic imaging, an emission spectrum with no sub-harmonic content is demonstrated, for an inter-bubble spacing ≈λ0. A spectral model for periodic shock waves from multiple nucleations demonstrates peak suppressions at nf0/2 when applied to the experiment, via a windowing effect in the frequency domain. Implications for single-element passive detection of cavitation are discussed

Publisher: 'Acoustical Society of America (ASA)'
Year: 2017
DOI identifier: 10.1121/1.4977236
OAI identifier: oai:eprints.gla.ac.uk:136748
Provided by: Enlighten

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