多模Lamb波信号时反过程频散补偿分析

Time Reversal Process of Multi-mode Lamb wave propagation and Its Dispersion Compensation

由于存在频散及多模效应,Lamb波的传播过程及其信号分析和处理往往十分复杂。本研究对基于时间反转理论的Lamb波频散效应补偿进行了研究,采用信号与系统理论描述了Lamb波信号时间反转聚焦原理和过程,并对聚焦信号中各组成部分的频散补偿效果进行了分析和实验验证。实验结果表明,时间反转处理可以对多模的Lamb波信号实现部分频散补偿。

Due to the multi-mode and dispersion effects of Lamb wave, the propagated signal analysis and processing were usually complicated. Research on dispersive compensation to Lamb wave was carried out based on time reversal theory. The principle and process of the Lamb wave time reversal focalization were given by signal and system theory. Effects of the dispersive compensation to the parts of the focalized signal were analyzed and experimentally validated. The experimental results show that time reversal process can compensate the dispersion of the multi mode Lamb waves partly.