Elimination of Liftoff Effect Using a Model-based Method for Eddy Current Characterization of a Plate

Mengbao Fan; Binghua Cao; Panpan Yang; Wei Li; Guiyun Tian

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Elimination of Liftoff Effect Using a Model-based Method for Eddy Current Characterization of a Plate

Mengbao Fan 1,Binghua Cao 2 *,Panpan Yang 1,Wei Li 1,Guiyun Tian 3

1.College of Mechanical and Electrical Engineering，China University of Mining and Technology

2.College of Information and Electrical Engineering，China University of Mining and Technology

3.Newcastle University

*Correspondence author

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Funding: 高等学校博士学科点专项科研基金资助项目（No.20120095120027）

Opened online:11 May 2016

Accepted by: none

Citation: Mengbao Fan,Binghua Cao,Panpan Yang.Elimination of Liftoff Effect Using a Model-based Method for Eddy Current Characterization of a Plate[OL]. [11 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4686491

Model-based inversion method has been studied extensively for characterization of a metal plate in eddy current testing. However, few reports cover liftoff elimination. In this work, model-based inversion method is evaluated in terms of liftoff reduction. For better inversion accuracy, a complex yet accurate procedure is presented to do calibrations of coil parameters before use. The results from simulations and experiments demonstrate that model-based inversion method has an exceptional ability to compensate influence of large liftoff variations by considering it as an unknown variable to be determined.

Keywords:eddy current; characterization; metal plate; liftoff effect; model-based method.

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