Experimental investigation of influence of ambient pressure on properties of lase-induced cavitation bubble collapse sound waves

The ambient pressure is one of the basic factors determining cavitation. In order to investigate the influence of ambient pressure on properties of lase-induced cavitation bubble collapse sound waves, besides analysing the influence of ambient pressure on properties of lase-induced cavitation bubble oscillation, the experimental investigation of the lase-induced cavitation bubble callapse in liquids with different ambient pressure was done with hig-speed video, the cavity sound waves generated by the cavitation bubble was detected with the hig-frequency hydrophone. The pressure inside the tank was accurately controlled by an air pump. The results show that the ambient pressure has obvious influence on the bubble oscillation, but has no influence on sound intensity and spectrum. The radiation frequency range is 0-50 kHz, the radiation sound wave energy is 0-20 kHz, and have two obvious frequency peak value at 2 kHz and 8 kHz.