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An online MFL sensing method for steel pipe based on the magnetic guiding effect

Lookup NU author(s): Dr Jianbo Wu, Chaoqing Tang



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.

Publication metadata

Author(s): Wu J, Fang H, Huang X, Xia H, Kang Y, Tang C

Publication type: Article

Publication status: Published

Journal: Sensors

Year: 2017

Volume: 17

Issue: 12

Online publication date: 15/12/2017

Acceptance date: 12/12/2017

Date deposited: 09/01/2018

ISSN (electronic): 1424-8220

Publisher: MDPI AG


DOI: 10.3390/s17122911


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