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驱动各元件，通过电子调节时间来产生所需模式兰姆波并进行检测的方法。研制了实现该方法的设备。通过实验证明，该装置可以产生多种模式的兰姆波。提出了利用各种模式的兰姆波对回波信号进行可视化的新方法。为了建立多模态兰姆波的高性能测试方法，对带有人工缺陷的试件进行了试验研究。结果表明，孔洞缺陷的回波信号与裂隙缺陷的回波信号不同。

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.