Title :
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
Abstract :
There is a need to inspect 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 :
electromagnetic devices; electromagnetic waves; finite element analysis; inspection; nickel; plates (structures); quality assurance; steel; 3D edge-based hexahedral nonlinear FEM; electromagnetic inspection technique; electromagnetic sensor; inspection probe; lift-off; mother steel; nickel-coated steel plate; nickel-layer thickness; permeability; production process; quality guarantee; thickness estimation; Coils; Conductivity; Inspection; Interpolation; Nickel; Permeability; Power engineering and energy; Probes; Steel; Thickness measurement;
Conference_Titel :
Electromagnetic Field Computation (CEFC), 2010 14th Biennial IEEE Conference on
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-4244-7059-4
DOI :
10.1109/CEFC.2010.5481872
