USING THE GMI EFFECT FOR DETECTING SMALL ROTATIONAL MOVEMENTS

Cristian Fosalau, Emil Vremera, Marinel Temneanu, Mihai Cretu

Abstract

The paper goal is to describe the way in which the Giant Magnetoimpedance Effect (GMI) occurring in the magnetic amorphous wires can be utilized to detect small rotational movements. The operation principle is based on modification of the wire impedance under action of a torsional stress when an ac low current flows through it. The schematic overview of an angle sensor built around this effect, along with some experimental results obtained upon the functional model are presented in the paper. Analysis was performed on the sensor behavior under different frequencies and intensities of the current flowing through the wire as well as under different values of an axial dc magnetic field applied to the wire in order to control the angle span of the sensor.

Keywords

angle sensor, GMI effect, amorphous wires

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PWC-2006-TC14-030u.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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