王敬时,徐晓东,程营,刘晓峻.利用激光超声技术研究表面微结构材料中瑞利波的传播特性[J].声学技术,2014,33(6):512~516 |
利用激光超声技术研究表面微结构材料中瑞利波的传播特性 |
Laser-ultrasonic investigation on Rayleigh wave propagation in surface micro-structures |
投稿时间:2014-07-02 修订日期:2014-08-25 |
DOI:10.3969/j.issn1000-3630.2014.06.007 |
中文关键词: 激光超声 分频 表面微结构 瑞利波 低通滤波 |
英文关键词: laser-ultrasonic frequency divider surface micro-structures Rayleigh waves low-pass filter |
基金项目:国家自然科学基金资助项目(11204145)、南通市科研项目(12R012). |
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中文摘要: |
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. |
英文摘要: |
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 increasing 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. |
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