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Lookup NU author(s): Dr Jianbo Wu,
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2017 by the authors. Licensee MDPI, Basel, Switzerland. In order to improve the sensitivity of online magnetic flux leakage (MFL) testing for steel pipe, a sensing method based on the magnetic guiding effect is proposed and investigated in this paper. Compared to the conventional contact sensing method using a non-ferromagnetic support, the proposed method creatively utilizes a ferromagnetic one to guide more magnetic flux to leak out. Based on Hopkinson’s law, the principle of the magnetic guiding effect of the ferromagnetic support is theoretically illustrated. Then, numerical simulations are conducted to investigate the MFL changes influenced by the ferromagnetic support. Finally, the probe based on the proposed method is designed and developed, and online MFL experiments are performed to validate the feasibility of the proposed method. Online tests show that the proposed sensing method can greatly improve the MFL sensitivity.
Author(s): Wu J, Fang H, Huang X, Xia H, Kang Y, Tang C
Publication type: Article
Publication status: Published
Online publication date: 15/12/2017
Acceptance date: 12/12/2017
Date deposited: 09/01/2018
ISSN (electronic): 1424-8220
Publisher: MDPI AG
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