摘要
从热弹与烧蚀机制两个方面,讨论了激光超声表面波的产生。通过对点光源激励声表面 波的机理进行分析,推导出线光源激励的表达式。进行了表面波同线光源能量、方向角、位置、长度关系的实验研究。实验结果验证了激光超声表面波理论模型的合理性,证实了线光源产生的表面波具有信号强、方向性好等优点。
The generation of surface ultrasonic waves is discussed from both the principles of thermo- elasticity and ablation. The expression for exciting with a laser line source is derived through analyzing the principle of exciting surface ultrasonic waves by a laser point source. The experimental investigation on the relations of the surface acoustic waves with the line source energy, azimuth, position and length is carried out. The experimental results verify the rationality of the theoretical model for laser generated surface ultrasonic waves and demonstrate that the surface ultrasonic waves generated by a line source has the advantages of powerful signal and good directivity.
出处
《光电工程》
CAS
CSCD
北大核心
2002年第5期68-72,共5页
Opto-Electronic Engineering
基金
博士点资金资助
关键词
激光超声
超声表面波
表面缺陷测量
激光线光源
Laser ultrasound
Surface ultrasonic waves
Surface-defaults detection
Laser line source
