Mode mixing in shear horizontal ultrasonic guided waves
Mode mixing in shear horizontal ultrasonic guided waves
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DOI：
10.1080/10589759.2016.1184268
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发表时间：
2017-06-01
影响因子：
2.6
通讯作者：
Dixon, S.
中科院分区：
文献类型：
--
作者：
Petcher, P. A.;Dixon, S.
SH导波越来越多地用于无损检测（NDT）应用，特别是用于使用周向导波模式的管道和管道支撑。在实际实施中，确保单模操作并不总是简单的，这需要在解释结果时加以考虑。在剪切水平（SH）波生成或SH导波与几何变化或缺陷的相互作用期间，取决于剪切波速度、操作频率、样品的厚度和换能器特性，可以产生多个SH导波模式。本文讨论了多SH模式混合（连续音生成和短脉冲串）时产生的干涉图样，以及干涉图样对无损检测等应用造成的问题。特别是，图案可以导致缺陷被错过在使用SH波的NDT检查，并提出了一种方法来规避这个问题。
SH guided waves are used increasingly for non-destructive testing (NDT) applications, particularly for pipes and pipe supports using circumferentially guided wave modes. In practical implementations, it is not always straightforward to ensure single-mode operation and this requires consideration when interpreting results. During shear horizontal (SH) wave generation or SH guided wave interaction with geometrical changes or defects, multiple SH guided wave modes may be produced, depending on the shear wave speed, the frequency of operation, the thickness of the sample and the transducer characteristics. This paper discusses the interference patterns created as the multiple SH modes mix (for both continuous tone generation and short bursts), and the problems caused by the interference patterns on applications such as NDT. In particular, the patterns can lead to defects being missed during an NDT inspection using SH waves, and a way to circumvent this problem is suggested.