ABSTRACT This study explores the application of algorithms with linear array ultrasonic testing for the characterization of hidden regions of impact damage in composites. An idealized ray tracing model was used to demonstrate the sensitivity of transmitted signals to the hidden impact profile, and a numerical model was used to provide insight on the incident field generated by linear array elements. Experimental studies were performed highlighting the differences in the response from no flaw, columnar and trapezoidal profiles. Algorithms were implemented to process full matrix capture data, register pitch-catch signals with the top delamination location and extent, and improve the signal-to-noise through combining multiple pitch-catch acquisitions. Lastly, a classifier was developed and verification testing demonstrated the ability to distinguish four different hidden profiles, indicating the importance of signal registration for successful classification.

中文翻译：

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复合材料中冲击损伤隐藏区域的一发一收超声波阵列表征

摘要 本研究探讨了线性阵列超声检测算法在复合材料中冲击损伤隐藏区域表征中的应用。理想化的光线追踪模型用于证明传输信号对隐藏撞击剖面的敏感性，并使用数值模型提供对线性阵列元件产生的入射场的洞察。进行了实验研究，突出了无缺陷、柱状和梯形轮廓的响应差异。实施了算法来处理全矩阵捕获数据，将一发一收信号与顶部分层位置和程度进行配准，并通过组合多个一发一收采集来提高信噪比。最后，