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Coupling pulse eddy current sensor for deeper defects NDT

Lookup NU author(s): Professor Gui Yun TianORCiD



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Elsevier B.V., 2019.

For re-use rights please refer to the publisher's terms and conditions.


© 2019 Elsevier B.V. Deep defect detection for ferromagnetic materials is a challenging task for Eddy Current testing (ECT)due to the skin effect of the low penetration depth. Pulsed Eddy Current testing (PECT)is a potential and effective method for detecting deep subsurface defects as it can obtain multiple depth information owing to its wide spectrum range. A novel weak coupling sensing structure of pulsed eddy current is proposed. In particular, the structure improves the ratio of the indirect coupling energy by reducing the direct coupling energy between the excitation and the detection coils. It obviously improves the ability to detect deep subsurface defects of ferromagnetic materials. The principle of penetration and the analysis of its equivalent circuit are presented. In addition, both experiments and simulations on different defects detection have been studied. The results have confirmed that all types of defects can be detected and it has shown the relatively monotonic linear relationships and reliability.

Publication metadata

Author(s): Xie L, Gao B, Tian GY, Tan J, Feng B, Yin Y

Publication type: Article

Publication status: Published

Journal: Sensors and Actuators A: Physical

Year: 2019

Volume: 293

Pages: 189-199

Print publication date: 01/07/2019

Online publication date: 30/04/2019

Acceptance date: 19/03/2019

Date deposited: 13/06/2019

ISSN (print): 0924-4247

ISSN (electronic): 1873-3069

Publisher: Elsevier B.V.


DOI: 10.1016/j.sna.2019.03.029


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