Eddy current phase gradient and its application in identification of conductive material defects

被引：0
|
作者：
Zhang R. [1 ]
Ye S. [1 ]
Ma M. [2 ]
Zhao Q. [3 ]
Wang H. [4 ]
机构：
[1] College of Electrical and Engineering and Automation, Tianjin Polytechnic University, Tianjin
[2] Key Laboratory for Advanced Textile Composites of Ministry of Education, Tianjin Polytechmic University, Tianjin
[3] College of Engineering, Qufu Normal University, Rizhao
[4] School of Electrical and Information Engineering, Tianjin University, Tianjin
来源：
Ma, Ming (6673891@qq.com) | 2018年 / Science Press卷 / 39期
关键词：
Defect classification; Eddy current testing; Phase angle gradient; Phase sensitive demodulation; Spatial domain phase spectrum analysis method;
D O I：
10.19650/j.cnki.cjsi.J1803930
中图分类号：
学科分类号：
摘要：
In this paper, the spatial domain phase spectrum analysis method is used to detect and classify different types of defects using phase angle gradient as the feature quantity of the defect detection signal. The digital phase sensitive demodulation technique is used to extract the phase angle gradient of the detected signal. A double air-cored coil eddy current sensor is used, to which a multi-frequency excitation signal of 1~10 kHz is applied to identify and classify the surface defects, subsurface defects and internal defects of the flat metal samples. The experiment results show that the experiment system can effectively detect the defects and obtain the visual detection results through spatial domain phase spectrum analysis. Using phase angle gradient as the feature quantity effectively suppresses the influence of the lift-off noise on the detection results. © 2018, Science Press. All right reserved.
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页码：134 / 141
页数：7
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