Variations in signal phase and beamformer gain due to bubble scattering
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. In, Papadakis, J.S. and Bjorno, L. (eds.) Proceedings of the Fourth International Conference on Underwater Acoustic Measurements, Technologies and Results. Heraklion, Greece, Institute of Applied and Computational Mathematics, 933-940. (In Press).
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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.
|Item Type:||Book Section|
|Keywords:||acoustic propagation in bubbly water, bubble scattering, beamformer gain, degradation in bubbly water|
|Subjects:||Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
|Divisions:||University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Fluid Dynamics and Acoustics
|Date Deposited:||21 Jul 2011 14:20|
|Last Modified:||08 Jun 2012 13:20|
|Publisher:||Institute of Applied and Computational Mathematics|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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