基于横波直探头的管道缺陷周向导波检测技术

Pipe Defects Detection Using Circumferential Guided Waves Based on Bulk Shear Wave Transducer

围绕厚壁管道的检测问题,基于横波直探头激励周向导波检测管道典型缺陷,通过改变横波直探头的布置方向激励出不同的周向导波模态,克服了柱面纵向导波对于轴向缺陷不敏感的问题,有效提升了检测效率.将横波直探头沿管道轴向方向进行移动,可实现管道周向的扫描检测,表明横波直探头用于检测管道缺陷时指向性良好,为管道轴向缺陷无损检测提供了方法.

For the detection of defects in thick-walled pipe,The bulk shear wave（ BSW） transducer was used to generate the circumferential Lamb wave to detect the typical defects. Different circumferential wave modes were excited by changing the arrangement direction,and the insensitivity problem to axial defects of cylindrical longitudinal guided waves was overcome. The detection efficiency was highly improved. By moving the bulk shear wave transducer along the pipe axial direction,the circumferential scanning examination can be realized. This demonstrates the good directivity for detection of the pipeline defects by bulk shear wave transducer. It provides a method for non-destructive testing of axial defects in pipelines.