Bubble Influence on the Behaviour of Sea-Water Plasma-Based Sound Sources

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Abstract:

Bubble phenomena in underwater sound sources are studied from a theoretical and experimental point of view. To start an analytical approach to the problem, the formation of vapour bubbles in the liquid during an electrical discharge was studied by implementing and solving a complete set of equations for the description of Joule heating both in time and space. The nonlinear equations governing the temperature and the electric potential in the liquid were solved numerically and validated by a direct comparison with experimental data. These data were obtained by measuring the acoustic pressure pulses as a function of time, for different electrode distances, and measuring voltage and current across the spark gap during the discharge. The bubble contribution to the radiated acoustic energy seems to be governed by geometric and electric parameters, giving a fairly controllable and predictable result in the electrical and acoustic behaviour of sparker sources. Therefore, a careful choice of these parameters is needed to optimize the system performance, namely acoustic efficiency, signal bandwidth and resolution.

Document Type: Research Article

Publication date: November 1, 1998

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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