Generation and Detection of Lamb wave Using Linear Array Thansducer, and Its Application Flaw Detection and Evaluation

提出了一种利用阵列式换能器，通过电子调节驱动各元件的定时，产生和检测所需模式的兰姆波的方法。研制了实现该方法的装置。通过实验验证了该装置可以产生多种模式的兰姆波，提出了利用多种模式兰姆波获取回波信号的可视化方法。为了建立一种高性能的兰姆波检测方法，对含有人工缺陷的试件进行了实验研究。发现孔缺陷的回波信号不同于狭缝缺陷。

The method with which a Lamb wave of the required mode is generated and detected by electronically adjusting the timing which drives each element using array-type transducer is presented. The equipment which realized this method was developed. By the experiment using this equipment, it was proven that the Lamb wave of various modes could be generated.The new method which visualized echo signal got using Lamb wave of various modes was proposed. In order to establish higlvperformance test method using Lamb wave of various modes, the experiment was carried out for test pieces having artificial flaw. It was found that the echo signal of a hole flaw differed from a slit flaw.