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

Song, J. H., Johansen, K. and Prentice, P. (2017) Covert cavitation: Spectral peak suppression in the acoustic emissions from spatially configured nucleations. Journal of the Acoustical Society of America, 141(3), EL216. (doi:10.1121/1.4977236)

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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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Song, Dr Jae Hee and Johansen, Kristoffer and Prentice, Dr Paul
Authors: Song, J. H., Johansen, K., and Prentice, P.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Journal of the Acoustical Society of America
Publisher:Acoustical Society of America
ISSN:0001-4966
ISSN (Online):1520-8524
Published Online:06 March 2017
Copyright Holders:Copyright © 2017 Acoustical Society of America
First Published:First published in Journal of the Acoustical Society of America 141(3):EL216
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
722331TheraCav - Harnessing Cavitation for TherapyPaul PrenticeEuropean Research Council (ERC)336189ENG - ENGINEERING SYSTEMS POWER & ENERGY