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Studies of Frequency-domain Feature Extraction and Defect Characterization in Pulsed Eddy Current Testing

Abstract

脉冲涡流检测是近年来发展迅速的一种比较先进的无损检测技术。由于脉 冲激励频谱分量丰富,因此相比于传统的涡流检测技术,其可以同时检测到被 测部件中不同深度的缺陷,获得更多的缺陷信息,在航空航天、核能电力、石 油化工等领域有着广阔的应用前景。本文研究脉冲涡流检测的信号特征提取和 缺陷表征方法,以提高脉冲涡流检测技术对缺陷的分类识别能力,从而推动脉 冲涡流检测技术的进步。 目前对脉冲涡流检测缺陷识别的研究主要集中在时域上,对脉冲涡流丰富 的频域信息的应用较少。脉冲激励信号可以被看作是一组多频不等幅正弦合成 信号,由于趋肤效应的存在,高频成分仅受到上表面缺陷的影响,而低频成分 会同时...Pulsed eddy current testing (PECT) is a nondestructive testing technique that develops fast in the recent years. The pulsed excitation comprises a broad band of frequencies and the response signal provides more information about defect than that of traditional eddy current testing. Therefore, PECT will play an important role in the maintenance of aircrafts, nuclear power plants, oil and gas tr...学位:工学硕士院系专业:物理与机电工程学院_航空宇航制造工程学号:3202011115271

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