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: | Johansen, Kristoffer and Prentice, Dr Paul and Song, Dr Jae Hee |
| 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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