Electromagnetic Inspection Technique of Thickness of Nickel-Layer on Steel Plate Without Influence of Lift-Off Between Steel and Inspection Probe

Author

Gotoh, Y. ; Matsuoka, A. ; Takahashi, N.

Author_Institution

Dept. of Mech. Energy Syst. Eng., Oita Univ., Oita, Japan

Volume

47

Issue

5

fYear

2011

fDate

5/1/2011 12:00:00 AM

Firstpage

950

Lastpage

953

Abstract

There is a need to inspect the thickness of a nickel layer of nickel-coated steel plate in the production process to guarantee the quality. The conductivity of a nickel layer in the nickel-coated steel is larger than that of mother steel, and its permeability is smaller than that of mother steel. Therefore, the estimation of thickness of the nickel-layer is possible by using differences of these electromagnetic properties. However, the signal is also influenced by the change of distance (lift-off) between the nickel-coated steel and an electromagnetic sensor. In this paper, the inspection method for measuring the thickness of nickel layer taking account of the lift-off is proposed using the 3-D edge-based hexahedral nonlinear FEM.

Keywords

coatings; electromagnetic devices; finite element analysis; inspection; nickel; permeability; plates (structures); probes; quality management; steel; 3D finite element method; conductivity; electromagnetic inspection technique; electromagnetic properties; electromagnetic sensor; inspection probe; nickel-coated steel plate; nickel-layer thickness; permeability; production process; Coils; Conductivity; Eddy currents; Inspection; Nickel; Steel; 3-D finite element method; Electromagnetic nondestructive inspection; lift-off; nickel-coated steel;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2010.2071856

Filename

5560773