文档介绍：仪器仪表学报
Chinese Journal of Scientific Instrument
ISSN 0254-3087,CN 11-2179/TH
、壁厚 mm，以及外壁半径 mm、壁厚 mm 的碳钢管
道，在中心频率 5 MHz、探头中心距 87 mm 的检测条件下，自适应解卷积方法能够将管道近表面分层盲区范围减少约 60%，
且到直达纵波声线距离不小于 mm 缺陷的深度定量误差不超过 %。同常规频谱分析方法和自回归谱外推方法相比，自
适应解卷积方法具有更优的盲区抑制效果，且能够准确定量前者难以检测的缺陷，测量误差不超过 %。
关键词：超声衍射时差法; 管道; 周向扫查; 盲区; 自适应解卷积
中图分类号：TH142 TB553 文献标识码：A 国家标准学科分类代码：
Reducing dead zone for TOFD circumferential scan of pipeline by the adaptive
deconvolution method
Jin Shijie, Zhang Bo, Wang Zhicheng, Sun Xu, Lin Li
(NDT & E Laboratory, Dalian University of Technology, Dalian 116085, China)
Abstract: When the circumferential scan is performed along the outer surface of pipeline by the ultrasonic time-of-flight diffraction
(TOFD) technique, the layered dead zone is generated in the near-surface area due to the influence of the pipe curvature and the pulse
width of direct longitudinal wave (DLW). In this article, the adaptive deconvolution