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
Download:
IMEKO-TC4-2011-064.pdf
DOI:
-
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
 Back