Book: Studies in Applied Electromagnetics and Mechanics 14, Electromagnetic Nondestructive Evaluation (II), Editors: R. Albanese, G. Rubinacci, T. Takagi and S.S. Udpa, IOS Press, Amsterdam (1998), ISBN: 90-5199-375-7, pp.160-169
FLUXSET Sensor Analysis Based on Nonlinear Magnetic Wire Model of the Core
Daniel Ioan(a), Ioan Florea Hantila(a), Mihai Rebican(a), Cristian Constantin(a)
(a)"Politehnica" University of Bucharest, Numerical Methods Lab., Spl. Independentei 313, 77206 Romania
The paper presents two accurate models for the FLUXSET sensors. Both models use
1D (a wire model) grid to discretise the ribbon core without discretising the
external domain. The first model is based on axisymetric approach in which the
external linear domain is analysed by analytical methods (separation of variable)
and the core is reduced to a nonlinear boundary condition. This approach allows the
computation of symbolic form of sensitivities. The second model is based on the
integral equation for the core magnetization, which is considered axially oriented.
The choice of wire model for the core allowed using the Katzenelson method to solve
the nonlinear systems, which has guaranteed convergence and proved to be more
effective than other classical methods. The paper presents the comparison between
the numerical results and the experimental ones. The numerical accuracy and the
needed computing resources are discussed.