Magnetic Crosstalk Suppression and Probe Miniaturization of Coupled Core Fluxgate Sensors

Abstract

This paper demonstrates the probe structure optimization of coupled core fluxgate magnetic sensors through finite element analysis. The obtained modelling results have been used to optimize the probe structures from horizontal-to vertical-arrangements for magnetic crosstalk suppression and probe miniaturization. The finite element analysis show that with the same distance between each adjacent fluxgate elements, the magnetic crosstalk is suppressed by 6 times and the volume is reduced by 2 times after the optimization. Furthermore, the miniaturized probes with low magnetic crosstalk have been designed and implemented. The experimental results which showed more than 5 times suppression of magnetic crosstalk verified the simulation results. Therefore, the results provide detailed reference to cope with the contradiction between volume miniaturization and magnetic crosstalk suppression in magnetic sensor-array design.

Design and Implementation of Close-loop Detection for Coupled Core Fluxgate Magnetic Sensors

“…6 shows the closed-loop structure of CCFM with feedback. The fluxgate elements are installed in a vertical arrangement for magnetic crosstalk suppression and probe miniaturization [19]. The CCFM probe contains three fluxgate elements which are coupled in a ring topology by the coupling circuits, and each fluxgate element consists of the magnetic core, excitation coil and induction coil.…”