In this paper, imaging results of defects in composite plates using guided wave-based algorithms, such as delay and sum and Excitelet, are presented. Those algorithms are applied to passive data for which the signal corresponding to each emitter-receiver couple is recovered as a result of the cross correlation of the ambient noise measured simultaneously by the two sensors. The transition to passive imaging allows the use of lighter sensors that are unable to emit ultrasonic waves, such as fiber Bragg gratings (FBGs) sensors on optical fibers, which are used in this study. The imaging results presented here show the feasibility of active and passive imaging in composite plates using FBGs as receivers, reducing the impact of the acquisition system on the structure in the context of structural health monitoring.

中文翻译：

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复合板的导波成像，使用布拉格光纤光栅进行被动采集。

本文介绍了基于导波算法的复合板缺陷成像结果，包括时延和求和与Excitelet。这些算法应用于无源数据，由于两个传感器同时测量到的环境噪声的互相关性，无源数据恢复了与每个发射器-接收器对相对应的信号。向无源成像的过渡允许使用无法发射超声波的较轻的传感器，例如本研究中使用的光纤上的光纤布拉格光栅（FBG）传感器。此处显示的成像结果显示了使用FBG作为接收器的复合板进行主动和被动成像的可行性，从而在结构健康监测的情况下减少了采集系统对结构的影响。