AC field modulated DC magnetic field sensor based on optical whispering gallery mode microcapillary resonator

Abstract

A sensitive DC magnetic field sensor is constructed by measuring the signal-to-noise ratio of an AC-modulated magnetic field at a particular frequency from an optical whispering gallery mode microcapillary resonator. The sensing element consists of an optical whispering gallery mode microcapillary resonator bonded to a magnetostrictive material that enables it to respond to external magnetic fields. A DC magnetic field sensitivity of 0.1703dB/Oe and a linear detection range from 4.8Oe to 65.7Oe are realized under an AC modulation field of 168.1kHz in the unshielded environment at room temperature. To our best knowledge, this sensitivity is about 2.3 times of the maximum sensitivity of other DC magnetic field sensors based on magnetic fluid or magnetostrictive material integrated fiber systems that use the dissipative sensing scheme. Furthermore, the sensor can operate at a stable temperature in the range of [-11∼45]°C, as long as the modulation frequency of the AC-modulation field is adjusted according to the ambient temperature. This sensor provides us with a novel DC magnetic field sensing scheme, which may play a role in industrial fields related to current and position detection in the future.

High sensitivity magnetic field sensing via a sandwich-type polydimethylsiloxane resonator

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“…Guo [25] et al, from Harbin Institute of Technology reported a hollow microbubble resonator based on fixed Terfenol-D, which achieved a tunable Q factor of 2.07 × 10 5 by tuning the WGMs with magnetic fields and a magnetic field sensitivity of 0.081 pm/mT. Yu [26] et al, reported a microcapillary resonator combined with magnetostrictive materials, achieving a DC magnetic field sensitivity of 0.1703 dB/Oe through AC magnetic field modulation. Rakhi et al reported the deflection vibration response and thermal moment of a resonator via a magnetic field [27] and illustrated the thermoelastic vibrations of a rotating resonator caused by a laser pulse heat source and sinusoidal heating in the context of three-phase thermo-elasticity [28].…”