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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >A rapid signal processing technique to remove the effect of dispersion from guided wave signals
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A rapid signal processing technique to remove the effect of dispersion from guided wave signals

机译：一种快速的信号处理技术，可消除导波信号中的色散影响

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摘要

Guided acoustic and ultrasonic waves have been utilized in various manners for non-destructive evaluation and testing. If a guided wave mode is dispersive, a pulse of energy will spread out in space and time as it propagates. For a long-range guided wave inspection application, this constrains the choice of operating point to regions on the dispersion curves where dispersion effects are small. A signal processing technique is presented that enables this constraint on operating point to be relaxed. The technique makes use of a priori knowledge of the dispersion characteristics of a guided wave mode to map signals from the time to distance domains. In the mapping process, dispersed signals are compressed to their original shape. The theoretical basis of the technique is described and an efficient numerical implementation is presented. The robustness of the technique to inaccuracies in the dispersion data is also addressed. The application of the technique to experimental data is shown and the resulting improvement in spatial resolution is demonstrated. The implications of using dispersion compensation in practical systems are briefly discussed.
机译：引导的声波和超声波已经以各种方式用于无损评估和测试。如果导波模式是分散的，则能量脉冲将随着传播而在空间和时间中散布。对于远程导波检查应用，这将操作点的选择限制在色散曲线上色散效果较小的区域。提出了一种信号处理技术，该技术可使对工作点的这种约束得到缓解。该技术利用了对导波模式的色散特性的先验知识来将信号从时域映射到距离域。在映射过程中，分散的信号被压缩为原始形状。描述了该技术的理论基础，并提出了一种有效的数值实现方法。还解决了该技术对色散数据不准确的鲁棒性。显示了该技术在实验数据上的应用，并证明了空间分辨率的提高。简要讨论了在实际系统中使用色散补偿的含义。

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