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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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  • Wuliang Yin
  • A. J. Peyton
  • Stephen J. Dickinson
<mark>Journal publication date</mark>08/2004
<mark>Journal</mark>IEEE Transactions on Instrumentation and Measurement
Issue number4
Number of pages4
Pages (from-to)1335-1338
Publication StatusPublished
<mark>Original language</mark>English


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.