Study of characteristics of ultrasound pulse generated by a laser pulse

作     者：QIAN Menglu ZHANG Wanchun and WU Tiancheng (Institute of Acoustics. Tongji Uaiversity. Shanghai 200092) 

出 版 物：《Chinese Journal of Acoustics》 (声学学报（英文版）)

年 卷 期：1994年第13卷第3期

页      面：202-212页

学科分类：07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 0702[理学-物理学] 

主　　题：Ultrasound pulse Laser pulse 

摘      要：The one-dimension thermal conduction equation and Navier-Stokes equa tion are used to get a pulse stress wave in a scmi-infinitc medium when a rectangular pulse laser of duration t_0 is incident on its surface. For both tfansparent and opaque samples the ultrasonic stress waveforms arc discussed when the sample surface is con strained or free. The experimental results in these two different boundary conditions of an opaque sample are presented. It is shown, theoretically and experimentally,that the ultrasound pulse thermoelastically generated by a pulse laser is monopolar when the sample surface is constrained and it is bipolar when its surface is free.