Covert cavitation: Spectral peak suppression in the acoustic emissions from spatially configured nucleations
| Autor: | Paul Prentice, Jae Hee Song, Kristoffer Johansen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Shock wave
Materials science Acoustics and Ultrasonics Field (physics) Hydrophone business.industry Acoustics 01 natural sciences Focused ultrasound 030218 nuclear medicine & medical imaging Physics::Fluid Dynamics 03 medical and health sciences 0302 clinical medicine Optics Arts and Humanities (miscellaneous) Acoustic emission Cavitation Frequency domain 0103 physical sciences Emission spectrum business 010301 acoustics |
| Zdroj: | The Journal of the Acoustical Society of America. 141:EL216-EL221 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.4977236 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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