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Total focusing method imaging of multidirectional CFRP laminate with model-based time delay correction

机译:多向CFRP层压板具有基于模型的时间延迟校正的全向CFRP层压板的总重点成像

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摘要

Precise knowledge of ultrasonic travel time in carbon fiber reinforced plastics (CFRP) is difficult to obtain due to the layered anisotropic nature. This paper proposes a model-based method to calculate the travel time of qP wave in CFRP laminates. The aim is to correct the time delays of total focusing method (TFM) applied to post-process the full matrix capture data for enhanced ultrasonic imaging. Experiments show that a 4.84 mm delamination is accurately sized by corrected TFM. The associated detection sensitivity is 46.0 dB and 3.6 dB above those of paintbrush acquisition and basic TFM, respectively.
机译:由于层状各向异性性质,难以获得碳纤维增强塑料(CFRP)中超声行进时间的精确知识。 本文提出了一种基于模型的方法来计算CFRP层压板中QP波的行驶时间。 目的是纠正应用于后处理后的总重点(TFM)的时间延迟全矩阵捕获数据,用于增强超声成像。 实验表明,通过校正的TFM精确尺寸为4.84mm分层。 相关的检测灵敏度分别为146.0dB和3.6 dB,分别为油漆刷采集和基本TFM。

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