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Differential coupling double-layer coil for eddy current testing with high lift-off

Lookup NU author(s): Professor Gui Yun TianORCiD


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IEEEThe detection sensitivity and lift-off impaction of the eddy current sensing are the challenges in the field of electromagnetic nondestructive testing. Higher detection sensitivity, larger lift-off capability, and deeper defect detectability remain challenges. This paper presents a double-layer differential planar coil with the discussion of the most sensitive coupling gap. The upper layer contains two symmetrical excitation coils as it can generate symmetrical and opposite magnetic fields. The rectangular structure makes the induced current uniform and symmetrical. The lower layer constructs a differential receiving coil, which can reduce the interference caused by the lift-off impaction as well as the external magnetic field. Different types of surface defects of metallic materials were used for validation. Experimental results show that properly increasing the distance between the excitation and detection layers can effectively improve its sensitivity. Simulation and experimental results confirm that the performance of high sensitivity can be maintained under large lift-off affection.

Publication metadata

Author(s): Chen K, Gao B, Tian G, Yang Y, Yang C, Ma Q

Publication type: Article

Publication status: Published

Journal: IEEE Sensors Journal

Year: 2021

Volume: 21

Issue: 16

Pages: 18146-18155

Print publication date: 15/08/2021

Online publication date: 30/04/2021

Acceptance date: 02/04/2018

ISSN (print): 1530-437X

ISSN (electronic): 1558-1748

Publisher: Institute of Electrical and Electronics Engineers Inc.


DOI: 10.1109/JSEN.2021.3076880


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