A Giant Magneto-Strictive Material-Based Fabry–Perot Interferometer-Type 3D Vector Magnetic Field Sensor

TL;DR

This paper introduces a 3D magnetic field sensor using three orthogonal interferometers bonded to a magneto-strictive material for high sensitivity and direction detection.

Contribution

A novel 3D vector magnetic field sensor using orthogonal Fabry–Perot interferometers and a GMM block for enhanced sensitivity.

Findings

The sensor achieved sensitivities of 245.13, 159.06, and 168.59 pm/mT on different planes.

CO2 laser modulation improved the sensitivity of the interferometers.

The sensor can determine both the magnitude and direction of magnetic fields simultaneously.

Abstract

This paper presents the design and experimental validation of a highly sensitive vector magnetic field sensor based on three mutually orthogonal Fabry–Perot interferometers (FPIs). The orthogonally arranged FPIs are bonded to a giant magneto-strictive material (GMM) block. Under an applied magnetic field, the magneto-strictively induced strain in the GMM block is transferred to the FPIs. Meanwhile, the FPIs, composed of single-mode fiber (SMF)–hollow-core fiber (HCF)–SMF, are further modulated by CO2 laser, by which the higher sensitivities are obtained. The highest sensitivities of FPIs achieved 245.13, 159.06, and 168.59 pm/mT on the X-Y, X-Z, and Y-Z planes, respectively. By demodulating the distinct wavelength drifts of the three orthogonal FPIs, both the magnitude and direction of the magnetic field can be simultaneously determined.

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