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Dispersion-based imaging for structural health monitoring using sparse and compact arrays

机译:基于分散的成像,用于使用稀疏和紧凑阵列的结构健康监测

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摘要

In this paper, a technique called 'excitelet' is presented for the imaging of damage in structures using the correlation of the signals measured at elements of piezoceramic arrays with dispersed versions of the excitation signal. This approach is presented as an extension of classical imaging techniques and takes advantage of the chirplet-based matching pursuit algorithm. The applicability for sparse and compact arrays is investigated experimentally on an aluminum plate and comparison with the existing embedded ultrasonic structural radar (EUSR) algorithm is performed for A0 and S0 modes for three frequency ranges of interest. Significant improvement of imaging quality is demonstrated with respect to imaging techniques using time-of-flight (ToF) and group velocity considerations for both sparse and compact piezoceramic array arrangements.
机译:在本文中,提出了一种称为“激发子”的技术,该技术利用在压电陶瓷阵列的元件处测得的信号与激发信号的离散形式的相关性,对结构中的损伤进行成像。这种方法是对经典成像技术的扩展,它利用了基于chi的匹配追踪算法。在铝板上对稀疏和紧凑阵列的适用性进行了实验研究,并针对感兴趣的三个频率范围的A0和S0模式,与现有的嵌入式超声结构雷达(EUSR)算法进行了比较。对于使用稀疏和紧凑型压电陶瓷阵列布置的飞行时间(ToF)和群速度的成像技术,成像质量得到了显着改善。

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