流-固界面波的激光激发与光偏转检测

Laser Induced Fluid-solid Interface Wave and Its Optical Detection

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QNd∶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2889m/s和339m/s、2916m/s和1512m/s、2872m/s和1184m/s,此实验值与理论计算值相比,偏差小于5%·

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 Schohe 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%.