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构建了激光空泡测量实验平台,使用脉冲激光聚焦击穿水介质产生激光空泡,由水听器对激光空泡溃灭辐射声信号进行接收,利用充气泵对高压水箱内的气压进行精确控制。通过仿真计算和实验对不同环境压强下的激光空泡特征和其溃灭时辐射声信号的峰值变化特性进行了研究。结果表明:当环境压强处在0.1~0.7 MPa范围内变化时,随着环境压强的增大,激光空泡首次脉动周期和空泡最大半径逐渐减小,两者的变化速率逐渐减小。空泡溃灭时辐射声信号的峰值声压在0.1~0.4 MPa内逐渐增大,在0.4~0.7 MPa内逐渐减小,且增大速率大于减小速率。
The experimental platform of laser cavity bubble measurement was established. The laser cavity was punctured by pulsed laser focusing and the laser cavity bubble was irradiated by the hydrophone. The air pressure in the high pressure water tank was precisely controlled by the air pump . The characteristics of laser cavitation under different ambient pressures and the characteristics of the peak change of the radiated acoustic signals during collapse are studied by means of simulation and experiments. The results show that the initial pulsation period and the maximum radius of cavitation decrease with the increase of ambient pressure when the ambient pressure is in the range of 0.1-0.7 MPa, and the rate of change decreases. When the bubble collapses, the peak sound pressure of the radiated sound signal gradually increases within 0.1-0.4 MPa and gradually decreases within 0.4-0.7 MPa, and the rate of increase is greater than the rate of decrease.