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THICKNESS MEASUREMENT OF A NONMAGNETIC METALLIC PLATE USING HARMONIC EDDY CURRENT EXCITATION AND A GMR SENSOR

A. Lopes Ribeiro, Helena G. Ramos, J. Couto Arez
  • Abstract:
    This paper describes the implementation of a device that measures the thickness of metallic plates. A pancake coil for magnetic field sinusoidal excitation is used and detection is performed with a bridge giant magneto-resistor sensor. The paper uses the theory of the linear transformer to explain the liftoff effect with a special attention to the point of intersection phenomenon.
  • Keywords:
    eddy currents, giant magneto-resistor sensor, liftoff, linear transformer theory
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  • DOI:
    _unreg_tc4-2011.064

Event details:

  • IMEKO TC:
    TC4
  • Event name:
    TC4 Symposium 2011
  • Title:

    XVIIIth IMEKO TC4 International Symposium on Measurement of Electrical Quantities (part of Metrologia2011, together with IX International Congress on Electrical Metrology - IX SEMETRO)

  • Place:
    Natal, BRAZIL
  • Time:
    27 September 2011 - 30 September 2011