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High sensitivity flexible double square winding eddy current array for surface micro-defects inspection

Lookup NU author(s): Dr Bin Gao, Professor Gui Yun TianORCiD


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© 2020 Elsevier B.V.High sensitivity surface micro-defects nondestructive testing on the complex geometric sample is a critical filed for the scientific and industrial community. This paper proposes a novel flexible eddy current sensing system that incorporates double square winding excitation with a multi detection flexible array for cracks inspection. The new structure consists of two square drive traces located in the separated layers while the pick-up traces are sandwiched between the drive traces. In particular, two excitation coils are in parallel and multi-turns thin spiral rectangular coils are detectors while the whole probe constitutes a transmitting-receiving-transmitting structure. The new structure offers capability and sensitivity for micro defects as well as directional defects inspection. The theoretical derivation based on magnetic circuit principles has been developed for analysis and interpretation of the results. Both numerical simulation and experiments on defects detection with different defect sizes and orientations have been supplemented to validate the reliability and efficiency of the proposed system.

Publication metadata

Author(s): Ma Q, Gao B, Tian GY, Yang C, Xie L, Chen K

Publication type: Article

Publication status: Published

Journal: Sensors and Actuators, A: Physical

Year: 2020

Volume: 309

Print publication date: 01/07/2020

Online publication date: 05/05/2020

Acceptance date: 15/01/2020

ISSN (print): 0924-4247

ISSN (electronic): 1873-3069

Publisher: Elsevier B.V.


DOI: 10.1016/j.sna.2020.111844


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