Abstract：To establish the cavitation mechanism of multimode ultrasound, the cavitation behaviour of bubbles was investigated.The multimode ultrasonic field was monitored by polyvinylidene fluoride (PVDF) sensor, and the ultrasonic cavitation noise under the combination of single, dual and triple frequencies was obtained. The fast Fourier transform was used to gain spectrum in frequency domain. Based on the ultrasonic waveforms with different frequencies, peak and average intensities were calculated. The results show that the noise intensity of triple frequency is the highest, and that of single frequency is the lowest. Spectrum amplitudes of multifrequency are higher than that of single frequency, and two peak values of frequency spectrum mainly focus on low frequency domain. Peak and average intensities of triple frequency are the highest, and that of single frequency is the lowest.
2017, Vol. 38 
