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Accelerated noncontact laser ultrasonic scanning for damage detection using combined binary search and compressed sensing

机译：结合二进制搜索和压缩传感的加速非接触式激光超声扫描以进行损伤检测

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摘要

Laser ultrasonic scanning is attractive for damage detection due to its noncontact nature, sensitivity to local damage, and high spatial resolution. However, its practicality is limited because scanning at a high spatial resolution demands a prohibitively long scanning time. Inspired by binary search and compressed sensing, an accelerated laser scanning technique is developed to localize and visualize damage with reduced scanning points and scanning time. First, the approximate damage location is identified by examining the interactions between the ultrasonic waves and damage at the sparse scanning points that are selected by the binary search algorithm. Here, a time-domain laser ultrasonic response is transformed into a spatial ultrasonic domain using a basis pursuit approach so that the interactions between the ultrasonic waves and damage, such as reflections and transmissions, can be better identified in the spatial ultrasonic domain. Second, wavefleld images around the damage are reconstructed from the previously selected scanning points using compressed sensing. The performance of the proposed accelerated laser scanning technique is validated using a numerical simulation performed on an aluminum plate with a notch and experiments performed on an aluminum plate with a crack and a carbon fiber-reinforced plastic plate with delamination. The number of scanning points that is necessary for damage localization and visualization is dramatically reduced from N · M to 21og_2N · log_2M. N and M represent the number of equally spaced scanning points in the x and y directions, respectively, which are required to obtain full-field wave propagation images of the target inspection region. For example, the number of scanning points in the composite plate experiment is reduced by 97.1% (from 2601 points to 75 points).
机译：激光超声扫描具有非接触性，对局部损伤的敏感性以及高空间分辨率，因此对于损伤检测很有吸引力。但是，由于以高空间分辨率进行扫描需要极长的扫描时间，因此其实用性受到限制。受二进制搜索和压缩传感的启发，开发了一种加速激光扫描技术，以减少扫描点和扫描时间来定位和可视化损坏。首先，通过检查超声波和二进制搜索算法选择的稀疏扫描点处的损伤之间的相互作用来确定近似的损伤位置。在此，时域激光超声响应使用基本追踪方法转换为空间超声域，从而可以在空间超声域中更好地识别超声波与损伤之间的相互作用，例如反射和透射。其次，使用压缩感测从先前选择的扫描点重建损伤周围的波形图像。拟议的加速激光扫描技术的性能可通过对带有缺口的铝板进行的数值模拟以及对具有裂纹的铝板和具有分层的碳纤维增强塑料板进行的实验来验证。损坏定位和可视化所需的扫描点数量从N·M大大减少到21og_2N·log_2M。 N和M分别表示在x和y方向上等距扫描点的数量，这些点是获取目标检查区域的全场波传播图像所需的。例如，复合板实验中的扫描点数减少了97.1％（从2601个点减少到75个点）。

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