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Pulse ultrasound waves of frequency 823 kHz with pulse widths from 100 μs to 270 s and different intensities were used to irradiate 2 mM terephthalic acid solution. The pulse cavitation peak was first observed in a reverberating field. The cavitation activity generated by an ultrasound pulse appears to be a maximum with an appropriate choice of pulse width. For an explanation of this discovery,...
To study the effect of a low-frequency pulse envelope on cavitation, the modulation depth was changed gradually, keeping the ON/OFF unchanged, and the cavitation valley phenomenon was discovered. The results show that the cavitation effect generated by amplitude modulation ultrasound appears to be minimized by an appropriate choice of the modulation depth.
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