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Lookup NU author(s): Junzhen Zhu,
Professor Gui Yun Tian,
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IEEE To achieve high-speed scanning of defect detection, this paper proposes a motion-induced eddy current (MIEC) thermography method, which utilizes the relative movement between permanent magnet array and the inspected object to induce the eddy current. Specifically, a set of circumferentially arranged permanent magnets rotating in a steel pipe is used to implement the proposed method. Numerical simulation and experimental studies are conducted to investigate the MIEC and thermal distribution influenced by speed, crack orientation, and lift-off effects. The results show that thermal contrast of the crack rises with its orientation to MIEC flowing path changing from parallel to perpendicular; thermal contrast decreases sharply with the lift-off distance of the magnet array increasing. One merit of the proposed MIEC thermography is that MIEC intensity (thermal contrast) increases with scanning speed and benefits the defect detection.
Author(s): Wu J, Zhu J, Tian G, Xia H, Huang X, Tang C
Publication type: Article
Publication status: Published
Journal: IEEE Transactions on Magnetics
Print publication date: 01/12/2018
Online publication date: 20/09/2018
Acceptance date: 25/08/2018
ISSN (print): 0018-9464
ISSN (electronic): 1941-0069
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