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Mutual Impedance of Cylindrical Coils at an Arbitrary Position and Orientation Above a Planar Conductor

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2 Author(s)
Theodoulidis, T. ; West Macedonia Univ., Kozani ; Ditchburn, R.J.

We derive a closed-form expression for the mutual impedance due to eddy-current induction for a pair of cylindrical air-core coils with arbitrary position and orientation above a planar conductor. By extending a recently devised model for individual coils with an arbitrary tilt with respect to the surface, we obtain a remarkably simple result. We validated our model with measurements on a conductive plate. The results should be useful for designing new probe configurations and for evaluating the signals in eddy-current inspections when driver-pickup coil configurations are utilized.

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Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 8 )