超声全聚焦法成像检测缺陷表征  

Flaw Characterization in Ultrasonic Imaging Inspection By Total Focusing Methods

作　　者：李衍 LI Yan(NDT Subcommittee of Wuxi Pressure Equipment Society, Wuxi 214026, China)

机构地区：[1]无锡市承压设备学会NDT学组,江苏无锡214026

出　　处：《无损探伤》2018年第3期1-4,共4页Nondestructive Testing Technology

摘　　要：超声相控阵(PAUT)全聚焦法是对图像重建区每一点作最佳聚焦的高级方法。本文展示用两种全聚焦法对均匀介质中的缺陷进行表征的实验结果:偏移法对横孔和水平线槽的重建图像,信噪比高、分辨力优,而标准法对倾斜线槽成像表征优。两法活用对PAUT缺陷表征颇有前景。The total focusing methods for ultrasonic phased array imaging are advanced approaches that optimally focus at each point of the reconstruction zone.This article shows experimental results of flaw characterization in homogeneous media using two types of total focusing methods,demonstrating that the migration approach leads to a better signal to noise ratio and a better resolution for side drilled hole and horizontal slit reconstruction.And the standard method achieves a better imaging of angled slits.Making right use of one of the two techniques is promising for flaw characterization in PAUT.

关 键 词：超声相控阵 全聚焦法 图像重建 标准法 偏移法 缺陷表征 

分 类 号：TG115.28[金属学及工艺—物理冶金]