超声检测中的兰姆波层析成像

Lamb wave tomography in ultrasonic testing

兰姆波作为超声导波 ,可以对薄板类结构实现大范围快速的检测。然而 ,从兰姆波数据中提取定量信息时对检测人员的技术素质提出了很高的要求。文章用兰姆波层析成像仿真实现了铝板中不同缺陷的重建图像。结果表明 :采用滤波反投影算法得到的层析图像给出了关于缺陷位置和类型的信息 。

As ultrasonic guided waves, Lamb waves allow large sections of thin sheet structures to be rapidly inspected. However, extraction of quantitative information from Lamb wave data requires well-trained personnel with datailed knowledge of mechanical waveguide physics. Simulation of tomographic image reconstruction of different defects in thin aluminum using Lamb waves is described in this paper. The tomographic images obtained by using a filtered back projection algorithm can provide information concerning the location and nature of the defects, which can be interpreted by a technician.