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Improvements to the methods used to measure bubble attenuation using an underwater acoustical resonator

Czerski, H; Vagle, S; Farmer, DM; Hall-Patch, N; (2011) Improvements to the methods used to measure bubble attenuation using an underwater acoustical resonator. The Journal of the Acoustical Society of America , 130 (5) , Article 3421. 10.1121/1.3569723. Green open access

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Abstract

Active acoustic techniques are commonly used to measure oceanic bubble size distributions, by inverting the bulk acoustical properties of the water (usually the attenuation) to infer the bubble population. Acoustical resonators have previously been used to determine attenuation over a wide range of frequencies (10–200 kHz) in a single measurement, corresponding to the simultaneous measurement of a wide range of bubble sizes (20–300 μm radii). However, there is now also considerable interest in acquiring measurements of bubbles with radii smaller than 16 μm, since these are thought to be important for ocean optics and as tracers for near-surface flow. To extend the bubble population measurement to smaller radii, it is necessary to extend the attenuationmeasurements to higher frequencies. Although the principles of resonator operation do not change as the frequency increases, the assumptions previously made during the spectral analysis may no longer be valid. In order to improve the methods used to calculate attenuation from acoustical resonator outputs, a more complete analysis of the resonator operation is presented here than has been published previously. This approach allows for robust attenuationmeasurements over a much wider frequency range and enables accurate measurements from lower-quality spectral peaks.

Type: Article
Title: Improvements to the methods used to measure bubble attenuation using an underwater acoustical resonator
Open access status: An open access version is available from UCL Discovery
DOI: 10.1121/1.3569723
Publisher version: http://dx.doi.org/10.1121/1.3569723
Language: English
Additional information: Copyright 2011 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in Czerski, H; Vagle, S; Farmer, DM; Hall-Patch, N; (2011) Improvements to the methods used to measure bubble attenuation using an underwater acoustical resonator. The Journal of the Acoustical Society of America , 130 (5) 3421 and may be found at http://dx.doi.org/10.1121/1.3569723
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1426198
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