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Simultaneous measurement of distance and thickness of a thin metal plate with an electromagnetic sensor using a simplified model

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3 Author(s)
Wuliang Yin ; Eng. Dept., Lancaster Univ., UK ; Peyton, A.J. ; Dickinson, S.J.

This paper presents a simplified model which can describe the inductance change when an air-core coil is placed next to a thin nonmagnetic metallic plate. The model has two independent parameters and is valid for a range of thickness, conductivity, and lift-offs. Use of this new relationship provides a fast and accurate method to measure the distance and thickness simultaneously. Measurements made for a sample coil next to thin copper and aluminum plates of various thicknesses verified the theory and the proposed method.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:53 ,  Issue: 4 )