Variations in signal phase and beamformer gain due to bubble scattering
Variations in signal phase and beamformer gain due to bubble scattering
We have investigated experimentally variations in the phase of acoustic signals propagating through bubble clouds and received at a three-element hydrophone array. The effect of bubbles in water to attenuate acoustic signals is well known, but the interest here is on the phase variation across the array introduced by bubble scattering, potentially decorrelating the signals across the array and reducing the gain that can be achieved by a beamformer. In this paper we report measurements made at the AB Wood acoustic water tank located at the Institute of Sound and Vibration Research (ISVR), University of Southampton, in June 2008. The distribution of signal phase among the individual hydrophones is seen to become more spread out as bubble density increases. As a result, beamformer gain is degraded. It seems that phase shifts caused by scattering from nearby bubbles are responsible for this effect.
acoustic propagation in bubbly water, bubble scattering, beamformer gain, degradation in bubbly water
933-940
Institute of Applied & Computational Mathematics
Culver, R. Lee
cc203f09-36c7-457f-b909-c5ecb96bcdb8
Park, J. Daniel
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Leighton, Timothy G.
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Coles, David G.H.
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Culver, R. Lee
cc203f09-36c7-457f-b909-c5ecb96bcdb8
Park, J. Daniel
c28fe44a-2819-44a8-a382-ba082c4c5c75
Leighton, Timothy G.
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Coles, David G.H.
de60477c-eb71-49e0-8038-5d2d030aa053
Culver, R. Lee, Park, J. Daniel, Leighton, Timothy G. and Coles, David G.H.
(2011)
Variations in signal phase and beamformer gain due to bubble scattering.
Papadakis, J.S. and Bjorno, L.
(eds.)
In Proceedings of the Fourth International Conference on Underwater Acoustic Measurements, Technologies and Results.
Institute of Applied & Computational Mathematics.
.
(In Press)
Record type:
Conference or Workshop Item
(Paper)
Abstract
We have investigated experimentally variations in the phase of acoustic signals propagating through bubble clouds and received at a three-element hydrophone array. The effect of bubbles in water to attenuate acoustic signals is well known, but the interest here is on the phase variation across the array introduced by bubble scattering, potentially decorrelating the signals across the array and reducing the gain that can be achieved by a beamformer. In this paper we report measurements made at the AB Wood acoustic water tank located at the Institute of Sound and Vibration Research (ISVR), University of Southampton, in June 2008. The distribution of signal phase among the individual hydrophones is seen to become more spread out as bubble density increases. As a result, beamformer gain is degraded. It seems that phase shifts caused by scattering from nearby bubbles are responsible for this effect.
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Accepted/In Press date: 2011
Keywords:
acoustic propagation in bubbly water, bubble scattering, beamformer gain, degradation in bubbly water
Identifiers
Local EPrints ID: 193903
URI: http://eprints.soton.ac.uk/id/eprint/193903
PURE UUID: 719ce956-d26a-478d-aebb-af8a51c6823b
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Date deposited: 21 Jul 2011 14:20
Last modified: 15 Mar 2024 02:45
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Contributors
Author:
R. Lee Culver
Author:
J. Daniel Park
Author:
David G.H. Coles
Editor:
J.S. Papadakis
Editor:
L. Bjorno
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