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Thickness Measurement of a Nonmagnetic Metallic Plate Using Harmonic Eddy Current Excitation and a GMR Sensor

Ribeiro, A. L. ; Ramos, H. ; Gonçalves, J.

Thickness Measurement of a Nonmagnetic Metallic Plate Using Harmonic Eddy Current Excitation and a GMR Sensor, Proc IMEKO TC4 Symp., Natal, Brazil, Vol. CD-ROM, pp. 1 - 6, September, 2011.

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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.