Title :
High power ultrasound for acoustic source applications
Author :
Mackersie, J.W. ; Timoshkin, I.V. ; MacGregor, S.J.
Author_Institution :
Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK
Abstract :
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.
Keywords :
acoustic emission; acoustic wave production; pulsed electroacoustic methods; pulsed power technology; ultrasonic applications; acoustic source applications; acoustic waves; electrode separation; energy loss; high power ultrasound; ionic conduction; pulsed power technology; voltage pulse; Acoustic applications; Acoustic emission; Acoustic pulses; Acoustic signal detection; Breakdown voltage; Electrodes; Power generation; Pulse generation; Pulse measurements; Ultrasonic imaging;
Conference_Titel :
Power Modulator Symposium, 2004 and 2004 High-Voltage Workshop. Conference Record of the Twenty-Sixth International
Print_ISBN :
0-7803-8586-1
DOI :
10.1109/MODSYM.2004.1433612