Pulsed eddy current technique for defect detection in aircraft riveted structures
Pulsed eddy current technique for defect detection in aircraft riveted structures
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DOI：
10.1016/j.ndteint.2009.10.010
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发表时间：
2010-03-01
影响因子：
4.2
通讯作者：
Liu, Bo
中科院分区：
文献类型：
--
作者：
He, Yunze;Luo, Feilu;Liu, Bo
脉冲涡流（PEC）技术是一种有效的定量检测多层结构中缺陷的方法。老龄飞机铆接结构的缺陷检测是一个难点。在对脉冲电化学技术进行理论分析的基础上，设计了三种不同的探头，即差动霍尔探头、差动线圈探头和两级差动线圈探头，用于检测这类缺陷。采用平均法和小波分析法对霍尔响应信号进行去噪处理。通过选取时域响应信号的峰值和过零时间作为关键特征，可以有效地检测铆接结构的缺陷。实验结果表明，差动线圈探头与差动霍尔探头一样有效。利用两级差动线圈探头可以检测铆接结构中第三层和第四层之间的缺陷。脉冲电化学技术在航空无损检测领域具有广阔的应用前景。皇冠版权所有（C）2009由爱思唯尔有限公司出版。保留所有权利。
The Pulsed Eddy Current (PEC) technique is an effective method of quantifying defects in multi-layer structures. It is difficult to detect defects in riveted structures of aging aircraft. Based on theoretical analysis of PEC technique, three different probes, including a differential hall probe, a differential coil probe, and a two-stage differential coil probe are designed to detect this kind of defects. The averaging method and wavelet analysis method are used to de-noise the hall response signals. By selecting peak amplitude and zero-crossing time of response signal in time domain as key features, defects in riveted structures can be detected effectively. The experimental results indicated that the differential coil probe acted as effectively as the differential hall probe. The defects between third layer and fourth layer in riveted structures can be detected by utilizing the two-stage differential coil probe. The PEC technique has a promising application foreground in the field of aeronautical nondestructive testing. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.