Design and testing of probe array with high resolution using alternating current field measurement technique

被引：0
|
作者：
Li W. [1 ]
Zhao J. [1 ]
Yuan X. [1 ]
Li X. [1 ]
Zhao J. [1 ]
Liu Y. [1 ]
机构：
[1] Center for Offshore Equipment and Safety Technology in China, University of Petroleum(East China), Qingdao
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2022年 / 46卷 / 05期
关键词：
alternating current field; probe array with high resolution; surface profile inversion; TMR sensor;
D O I：
10.3969/j.issn.1673-5005.2022.05.014
中图分类号：
学科分类号：
摘要：
For the large space of the sensor array in the alternating current field measurement (ACFM) probe, the spatial resolution of the measured distorted magnetic image is a bit low. As a result, the accurate morphology of the defects cannot be reconstructed. Therefore, an ACFM probe array and the testing system were set up based on a high resolution TMR magnetic field sensor array. On the basis of the finite element software Comsol the ACFM simulation model was established. The distortion law around different defects of the induced electromagnetic field was analyzed. The relationship between the defect surface profile and the magnetic field image was explored. The high resolution sensor array was designed with the spacing of 1 mm. The range of uniform current field was analyzed by simulations. A multiplexing module was designed to preprocess the signal output from the sensor array. The structure of the detection probe was then designed. In succession, the testing system was set up to carry out the defect detection experiment. The results show that Bz(magnetic field perpendicular to the specimen) image and Bx (magnetic field parallel to the probe̍s scanning direction) image can reflect the information on the edge of the defect respectively. The high resolution magnetic field image of the distortion around the defect can be obtained by the ACFM probe array. The surface profile of the defect can be imaged visually and be accurately evaluated by the image of the magnetic field. © 2022 University of Petroleum, China. All rights reserved.
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页码：126 / 132
页数：6
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