Enhancement of nonlinearity and parametric sonar using bubbles


Mantouka, A., Leighton, T.G. and Humphrey, V.F., (2007) Enhancement of nonlinearity and parametric sonar using bubbles Papadakis, J.S. and Bjorno, L. (eds.) In Proceedings of the Second International Conference on Underwater Acoustic Measurements, Technologies and Results. Institute of Sound and Vibration Research. 6 pp, pp. 577-582.

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Description/Abstract

The potential of nonlinear pulsating bubbles to improve the performance of parametric sonar has been known for some years, but exploitation of this phenomenon and its theoretical modelling is still under investigation. This paper focuses on some theoretical aspects of determining sonar parameters through modelling nonlinearly pulsating gas bubbles in water. Existing expressions for these parameters were developed when bubble theories had newly appeared, and since then they were not always been updated with all the new modelling aspects. Without models, which encompass the relevant physics, it is not possible to estimate sonar performance and its feasibility in bubbly waters. For example, analytical formulae used today for the prediction of the coefficient of nonlinearity are based on the Rayleigh equation, which later was improved with damping effects. These formulae result in lower (and for some frequencies unphysical) predictions for the coefficient of nonlinearity. Analytical formulae from this work were used to estimate the parametric output. The sonar drive frequency was 920 kHz and the difference frequency 50 kHz. Tank experiments were undertaken in fresh water with low void gas bubbles to compare with this modelling approach.

Item Type: Conference or Workshop Item (Paper)
Venue - Dates: 2nd International Conference & Exhibition on "Underwater Acoustic Measurements: Technologies & Results", 2007-06-25 - 2007-06-29
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Keywords: nonlinear bubble pulsations, parametric sonar, coefficient of nonlinearity
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ePrint ID: 49419
Date :
Date Event
2007Published
Date Deposited: 12 Nov 2007
Last Modified: 16 Apr 2017 18:18
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/49419

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