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An original approach to eddy current problems through a complex electrical image concept

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2 Author(s)
I. Dufour ; Lab. d'Electricite Signaux et Robotique, Ecole Normale Superieure de Cachan, France ; D. Placko

In this paper, we propose an original method for the physical analysis of electromagnetic interactions between an inductive sensor and any homogeneous conducting plane target. In the first part of this paper, the basic principles of inductive sensors are recalled. Then, we solve Maxwell's equations in order to obtain an analytical model for the relationship between the target properties and the electrical signals for a U-shaped sensor. Next, we emphasize the fact that our analytical relations can be interpreted as an extension of the electrical image method, even in the most difficult case of conducting and magnetic targets. In the last part, we present some measurements illustrating this new electrical image concept

Published in:

IEEE Transactions on Magnetics  (Volume:32 ,  Issue: 2 )