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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Processing of Ultrasonic Array Signals for Characterizing Defects. Part II: Experimental Work
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Processing of Ultrasonic Array Signals for Characterizing Defects. Part II: Experimental Work

机译：超声阵列信号的处理以表征缺陷。第二部分：实验工作

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摘要

This is Part II of the two-part paper aimed at integrating the numerical synthesis and experimental investigation of the ultrasonic wave propagation model for quantitative nondestructive evaluation. The first part of the paper focused on synthesizing and predicting measured signals using the boundary element method and the deconvolution technique based on the comparison between the signals obtained from defective and undamaged (reference) specimens. In the second part, we present an inversion technique which allows us to obtain the position and size of the defect. The inversion scheme is processing the frequency domain information rather than time-domain time-of-flights or vibration eigenmodes. This technique is tested experimentally for the case of a side-drilled hole with a non-trivial location in terms of standard pulse-echo techniques. It is shown that the scheme is particularly effective when the information of the defect is masked by other predominant signal components.
机译：这是两部分的第二部分，旨在将数值模拟和超声传播模型的实验研究相结合，以进行定量无损评估。本文的第一部分着重于使用边界元法和反卷积技术基于从有缺陷和未损坏（参考）样本获得的信号之间的比较来合成和预测测量信号。在第二部分中，我们介绍了一种反转技术，该技术可使我们获得缺陷的位置和大小。反转方案正在处理频域信息，而不是时域飞行时间或振动本征模式。就标准脉冲回波技术而言，该技术已针对具有非平凡位置的侧面钻孔情况进行了实验测试。结果表明，当缺陷信息被其他主要信号分量掩盖时，该方案特别有效。

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