Title :
Temperature Insensitive Magnetic Field Sensor Based on Ferrofluid Clad Microfiber Resonator
Author :
Xianli Li ; Hui Ding
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´an Jiaotong Univ., Xi´an, China
Abstract :
In this letter, an inherently temperature insensitive magnetic field sensor based on microfiber knot resonator with ferrofluid as cladding was theoretically and experimentally demonstrated. It was theoretically shown that the thermal property of the proposed sensor could be effectively suppressed by selecting the optimal microfiber diameter. On the basis of that, a sensor with its microfiber diameter of 2.92 μm was experimentally fabricated and its temperature sensitivity was demonstrated to be as low as 0.17 pm/°C with the temperature ranging from 20 °C to 80 °C. The results take a step forward toward the development of thermal stable devices based on the microfiber resonators.
Keywords :
fibre optic sensors; magnetic field measurement; magnetic fluids; magnetic sensors; micro-optics; microcavities; microfabrication; optical fabrication; optical fibre cladding; optical fibre testing; thermal properties; ferrofluid clad microfiber knot resonator; optical fabrication; size 2.92 mum; temperature 20 degC to 80 degC; temperature insensitive magnetic field sensor; thermal property; Magnetic fields; Optical fiber sensors; Optical fibers; Optical resonators; Optical surface waves; Refractive index; Temperature sensors; Temperature insensitive; ferro-fluid; magnetic field sensor; microfiber knot resonator;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2358454