| 激光超声表面缺陷检测的实验方法 |
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| 引用本文： | 严刚,徐晓东,沈中华,陆建,倪晓武.激光超声表面缺陷检测的实验方法[J].光电子．激光,2006,17(1):107-110. |
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| 作者姓名： | 严刚 徐晓东 沈中华 陆建 倪晓武 |
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| 作者单位： | 1. 南京理工大学信息物理与工程系,江苏,南京,210094
2. 南京大学声学研究所,江苏,南京,210094 |
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| 基金项目： | 中国科学院资助项目;高等学校优秀青年教师教学科研奖励计划 |
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| 摘 要： | 提出了一种非接触式、全光学激光超声检测的实验方法。利用Nd：YAG脉冲激光器、He-Ne激光器和平衡接收器构建一套基于光束偏转法的光差分检测系统，测量了表面带缺陷Al样品的声表面波（SAWs）。通过实验获得了SAWs经过表面缺陷时产生的反射回波及透射波形的特征，说明了线光源产生的超声波非常适合材料表面缺陷的检测。
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| 关 键 词： | 激光超声 声表面波(SAW) 表面缺陷 光差分 |
| 文章编号： | 1005-0086（2006）01-0107-04 |
| 收稿时间： | 2005-04-10 |
| 修稿时间： | 2005-04-102005-10-03 |
An Experimental Method of the Laser-generated Ultrasonic Waves for Detecting the Surface-breaking Defects |
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| YAN Gang,XU Xiao-dong,SHEN Zhong-hu,LU Jian,NI Xiao-wu.An Experimental Method of the Laser-generated Ultrasonic Waves for Detecting the Surface-breaking Defects[J].Journal of Optoelectronics·laser,2006,17(1):107-110. |
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| Authors: | YAN Gang XU Xiao-dong SHEN Zhong-hu LU Jian NI Xiao-wu |
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| Abstract: | A noncontact all-optical method for laser ultrasound detection is described.The surface acoustic waves(SAWs) were excited by employing a Nd:YAG laser on the sample Al plate with artificial surface-breaking defects and detected by a kind of optical difference detection system based on the optical beam deflection technique using a He-Ne laser.From the experiment,we attain the characteristics of reflected wave and transmitted wave generated by SAWs interacted with the surface-breaking defects,which show that the SAWs generated by laser line source are potential for the surface-breaking defects. |
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| Keywords: | laser ultrasound surface acoustic wave(SAW) surface-breaking defects optical difference |
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