CAJ | 학술논문

利用激光超声无损检测的实验方法，观察记录了瑞利波在具有不同表面微结构厚铝板中的传播过程，研究了表面微结构的声传输特性。对具有不同结构参数的微结构样品进行了分组对比实验，结果表明在一定深度范围内，表面微结构具有明显的分频效应。瑞利波中相对高频的部分被反射，反射信号通带带宽主要受制于微结构的深度，其能量主要受微结构宽度影响。相对低频部分沿表面继续传播，因此表面微结构同时具有一定的低通滤波效应。
이용격광초성무손검측적실험방법，관찰기록료서리파재구유불동표면미결구후려판중적전파과정，연구료표면미결구적성전수특성。대구유불동결구삼수적미결구양품진행료분조대비실험，결과표명재일정심도범위내，표면미결구구유명현적분빈효응。서리파중상대고빈적부분피반사，반사신호통대대관주요수제우미결구적심도，기능량주요수미결구관도영향。상대저빈부분연표면계속전파，인차표면미결구동시구유일정적저통려파효응。
The propagation of laser-generated Rayleigh wave on a thick aluminum plate with the surface micro-structure has been investigated by experiment. Experimental results have proved that the surface micro-structure act as a frequency divider for the Rayleigh wave within a certain depth range. The high-frequency part of the Rayleigh wave is reflected. Bandwidth of the reflected pass band is closely related to the depth of the surface micro-structure, and advanced by in-creasing the depth of the micro-structure. The amplitude of the reflected acoustic wave is suppressed by increasing the width of surface micro-structure. The low-frequency part propagates of the Rayleigh wave on the sample surface without disturbance, and the surface micro-structure works as a low-pass filter.