Acoustic Path Filtering for Improved Multimode Total Focusing Method Inspection

IF 0.5 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
B. Lepage, Guillaume Painchard-April
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引用次数: 1

Abstract

Total focusing method (TFM) is an ultrasonic testing (UT) technique that provides nondestructive testing (NDT) inspectors with new imaging modes, enabling more accurate detection, sizing, and representation of challenging defects. While TFM may offer convenient, nearly true-to-geometry imagery as the inspection result, it is often detrimentally affected by mode conversion artifacts. Current standards, such as ASME Section V, place the burden on the inspector to explain the origins of those artifacts, impacting the productivity and reliability of the inspection. A method enabling direct control of the ultrasonic wave propagation modes—that is, transverse wave (T) or longitudinal wave (L)—through each interface of the acoustic path is proposed and evaluated in this paper. This control is achieved after the full matrix capture acquisition by modulating, according to the desired propagation mode, the gain applied on the individual paths within the summation process. This leads to the formation of a Path-Filtered Total Focusing Method image. Empirical results on various use cases show considerable improvement of the signal-to-noise ratio through the almost complete elimination of signals originating from undesired paths.
改进多模全聚焦法检测的声路滤波
全聚焦法(TFM)是一种超声检测(UT)技术,它为无损检测(NDT)检测人员提供了新的成像模式,能够更准确地检测、确定尺寸和表示具有挑战性的缺陷。虽然TFM可以提供方便的、近乎真实的几何图像作为检查结果,但它经常受到模式转换工件的不利影响。当前的标准,例如ASME Section V,将解释这些工件的来源的负担放在检查员身上,影响了检查的生产力和可靠性。本文提出并评估了一种直接控制超声波传播模式的方法,即横波(T)或纵波(L)通过声路的每个界面。这种控制是在全矩阵捕获采集后通过调制实现的,根据所需的传播模式,增益应用于求和过程中的单个路径。这导致形成路径滤波的全聚焦方法图像。各种用例的经验结果表明,通过几乎完全消除来自不希望的路径的信号,信噪比有了相当大的改善。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials Evaluation
Materials Evaluation 工程技术-材料科学:表征与测试
CiteScore
0.90
自引率
16.70%
发文量
35
审稿时长
6-12 weeks
期刊介绍: Materials Evaluation publishes articles, news and features intended to increase the NDT practitioner’s knowledge of the science and technology involved in the field, bringing informative articles to the NDT public while highlighting the ongoing efforts of ASNT to fulfill its mission. M.E. is a peer-reviewed journal, relying on technicians and researchers to help grow and educate its members by providing relevant, cutting-edge and exclusive content containing technical details and discussions. The only periodical of its kind, M.E. is circulated to members and nonmember paid subscribers. The magazine is truly international in scope, with readers in over 90 nations. The journal’s history and archive reaches back to the earliest formative days of the Society.
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