用光学的方法验证流体饱和孔隙介质中慢纵波的存在

Examination on the existence of slow wave in fluid saturated porous medium (FSPM) with the optical method

摘要: 用阴影法(Shadowgraph)和CCD照相,观测到声脉冲透过流体饱和孔隙介质(按英文"Fluidsaturatedporousmedum"的第一个字母缩写为FSPM)样品后在水中传播的三个声脉冲,这三个声脉冲分别对应于FSPM样品中的三种体波(快纵波、横波、慢纵波)的转换模式.由阴影法记录的三个透射声脉冲的位置与计算结果以及发射一接收法的测量结果一致.

Abstract: With the shadowgraph method,three ultrasonic pulses in water,which corresponds to the conversion modesof the fast compressional wave the transverse wave and the slow compressional wave in the sample of fluid-saturatedporous medium (FSPM) respectively,were observed and recorded by CCD camera.The position of each pulse is consistentwith the computed position and the results measured by transducer.