水下光击穿所激发的声场的方向特性

Directivity of sound field generated through mechanism of laser- induced liquid breakdown in water

本文对水中光击穿时所激发的声场的指向特性进行了理论和实验研究。理论分析是根据下述模型:一系列含等离子体的球形小腔体均匀分布在一条短直线段上,并且每一个腔体可看作是一个点脉冲声源。文中给出了声脉冲信号幅度与宽度和接收方向之间的理论关系式,理论分析较好地描述了实验测量结果。

The Directivity of the sound field generated through the mechanism of the laser-induced liquid breakdown in water is investigated both theoretically and experimentally. The theoretical analysis is based on the following model: A series of small spherical cavities including plasma are homogeneously distributed on a short straight line segment and every such cavity may be considered as a point source radiating acoustic impulse. Theoretical expressions of the relations between the amplitude and width of acoustic impulse and the receiving direction are given in this paper. Experimental results are in agreement with theoretical predictions.