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New Magnetic Field Sensor Based on Combined Flux-Gate/Hall-Effect Arrangement

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3 Author(s)
Chris Petridis ; Lab. of Phys. Metall., Nat. Tech. Univ. of Athens, Athens ; Panagiotis D. Dimitropoulos ; Evangelos Hristoforou

A novel planar magnetic field sensor is presented that is based on a combined flux-gate/Hall-effect arrangement capable of measuring the three components of a three-dimensional quasi-static magnetic field. The proposed device involves a thin, isotropic, circular magnetic core, the magnetization of which is driven to saturation by means of a rotating excitation-field, produced by four printed planar coils. That way, the core magnetization rotates, without Barkhausen jumps inducing a flux-density change that is sensed by a Hall device positioned at the edge of the core. The presented sensor consists of a discrete Hall device, electronic modulation-demodulation circuitry and a circular amorphous core packaged on a printed circuit board (PCB), constructed as a proof of concept for the proposed magnetic field measuring method.

Published in:

IEEE Sensors Journal  (Volume:9 ,  Issue: 2 )