流-固界面波的激光激发与光偏转检测

基于光偏转原理,研制了可用于流-固界面波探测的光纤传感装置.在此基础上,建立了以调Q Nd∶YAG激光为流-固界面波激发光源的实验系统.实验上探测了激光在空气-铝、水-铝和酒精-铝等界面上激发的界面波波形.根据实验波形,算得在这三种界面上的泄漏Rayleigh波和Scholte波的速度分别为2889 m/s和339 m/s、2916 m/s和1512 m/s、2872 m/s和1184 m/s,此实验值与理论计算值相比,偏差小于5％.

Laser Induced Fluid-solid Interface Wave and Its Optical Detection

Based on the principle of light deflection,a fibre-sensor equipment was developed for detecting the fluid-solid interface wave. And then,an experiment system was established,in which a Q-switched Nd YAG laser was applied to excite the fluid-solid interface wave. The interface waves,which were induced by laser at the air-aluminum,water-aluminum,and alcohol-aluminum interfaces,were experimentally detected.The velocity of Leaky Rayleigh wave and Scholte wave on the three interfaces derived from the wave profiles,were 2889 m/s and 339 m/s,2916 m/s and 1512 m/s,2872 m/s and 1184 m/s respectively.Compared with theoretical value,the relative deviation was less than 5%.