A single probe spatial averaging technique for guided waves and its application to surface wave rail inspection
A single probe spatial averaging technique for guided waves and its application to surface wave rail inspection
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DOI：
10.1109/tuffc.2007.539
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发表时间：
2007-11-01
影响因子：
3.6
通讯作者：
Cawley, Peter
中科院分区：
文献类型：
--
作者：
Hesse, Daniel;Cawley, Peter
利用导波对结构进行无损检测需要具有高模式选择性的系统。通常，这通过包括多个换能器环或阵列的相对复杂的探头来实现。对于仅部分进入波导的非常长的结构的快速检测，这可能不是可行的解决方案。在本文中，我们提出了一个非常灵活的替代方案，即一个简单的强大的探头被扫描沿着的波导，和所获得的扫描数据用于定制的模式选择性在后处理阶段。这种空间平均方法的特点进行了讨论，使用一个简单的分析模型，并与现有的线性阵列技术。模式的选择性被发现主要是有限的相速度的不确定性，假设为感兴趣的模式。该方法已成功地应用于表面波钢轨检测，并发现抑制不必要的模式非常有效。
The nondestructive testing of structures using guided waves requires systems with high mode selectivity. Usually this is achieved with relatively complex probes comprising multiple transducer rings or arrays. For the rapid inspection of very long structures with only partial access to the waveguide, this may not be a viable solution. In this paper we present a very flexible alternative whereby a simple robust probe is scanned along the wave guide, and the acquired scan data is used for customizing the mode selectivity at the postprocessing stage. The characteristics of this spatial averaging method are discussed using a simple analytical model and compared to an existing linear array technique. The mode selectivity is found to be mainly limited by the uncertainty of the phase velocity assumed for the mode of interest. The method was successfully applied to surface wave rail inspection and was found to suppress unwanted modes very efficiently.