Open AccessMagnetic field sensor of enhanced sensitivity and temperature self-calibration based on silica fiber Fabry-Perot resonator with silicone cavity
Author(s) -
Bin Zhou,
Changtao Lu,
Bangning Mao,
Hwa Yaw Tam,
Sailing He
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.008108
Subject(s) - materials science , fabry–pérot interferometer , optics , fiber bragg grating , silicone rubber , resonator , magnetic field , optical fiber , fiber optic sensor , sensitivity (control systems) , silicone , optoelectronics , fiber , composite material , wavelength , physics , quantum mechanics , electronic engineering , engineering
In this paper, a magnetic field sensor with enhanced sensitivity based on a fiber Fabry-Perot (F-P) cavity formed by a pair of identical fiber Bragg gratings (FBGs) is demonstrated. The F-P cavity which was filled with silicone rubber was bonded to a magnetic alloy at two positions such that when longitudinal strain is applied, the cavity is lengthened while the FBGs was virtually strain-free, effectively magnified the magnetic-field induced strain of the magnetic alloy. The FBGs could also be used for temperature-compensation because the FBG spectrum change is negligible compared to the F-P spectrum.