激光超声在检测金属表面裂纹深度上的应用与研究

摘要

Laser ultrasonic has great application prospect in nondestructive testing. The article mainly introduced the generation and detection of surface acoustic wave (SAW) on the samples. By the processing and analysis of SAW signal, We found that the signal characteristic : the ratio of transmission wave peak ① and reflection wave peak ② has corresponding relationship with the depth of the cracks on the sample. The corresponding relationship is helpful to detect the tiny crack on the sample.%激光超声在无损检测方面有很大的应用前景。文章中主要介绍了表面波在样本上的激励和探测，通过对表面波信号的处理和分析，发现信号的“透射波波峰①与反射波波峰②峰值比”这一特征量与样本上裂纹的深度有对应关系。这一对应关系，有助于检测到样本上的微小裂纹。