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High power ultrasound for acoustic source applications

Mackersie, J.W. and Timoshkin, I. and MacGregor, S.J. (2004) High power ultrasound for acoustic source applications. In: Proceedings of the 26th international power modulator symposium and 2004 high voltage workshop. IEEE, New York, pp. 458-461. ISBN 0780385861

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High Power Ultrasound (HPU) can be generated by the application of Pulsed Power Technology to produce acoustic waves of high power and bandwidth. A study was conducted into the variation of the amplitude and frequency content of the acoustic signal with the applied voltage, pulse energy and electrode separation. Measurements indicate that, for a given electrode separation, whilst there is some increase in the amplitude of the detected acoustic emission with an increase in the electrical pulse energy it is only a modest effect. For a given pulse energy a considerably greater increase in the acoustic signal is observed when the distance between the electrodes is extended - thereby increasing the size of the signal source. The maximum amplitude of the detected signal approximately varies as the electrode separation to the power of (2)/(3). At large separations the delay time between the application of the voltage pulse and the breakdown of the water is considerable thus allowing energy loss through ionic conduction in the water.