Cavitation detection with subharmonic emissions by low intensity sustaining ultrasound

Control of acoustic cavitation by ultrasound pulse has been investigated recently. Cavitation detection is an factor for the cavitation control. In this study, detection which has been used to detect the acoustic in continuous sonication is applied to pulsed sequence using low intensity sustaining ultrasound. sustaining ultrasound follows just after the high intensity pulse. The power of the sustaining ultrasound is low to avoid cavitation inception by itself. When the microbubbles are generated and grow to the certain by the high intensity pulsed ultrasound, the sustaining prevents the dissolution due to rectified diffusion. , the bubbles can grow enough to emit subharmonic pressure. With this method, the cavitation generated by pulsed ultrasound was clearly detected.