Title :
Magnetic Field Sensor Based on Microfiber Sagnac Loop Interferometer and Ferrofluid
Author :
Fangxing Lv ; Chunyang Han ; Hui Ding ; Zhongying Wu ; Xianli Li
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´an Jiaotong Univ., Xi´an, China
Abstract :
We demonstrate a novel compact optical magnetic field sensor composed of a single-mode microfiber sagnac loop interferometer (SMSLI) and ferrofluid (FF). The refractive index of FF cladding in the twist area of SMSLI is changed with the externally applied magnetic field, which makes the dip-wavelength of the SMSLI transmission spectra shift. The experimental results show that the transmission spectrum of the proposed sensor shifts regularly with the change of externally applied magnetic field intensity. When the magnetic field intensity increased from 0 to 600 Oe, the dip-wavelength of transmission spectrum shifted nearly 200 pm. In addition, a minimal detectable magnetic field strength of the sensor responding to the 50-Hz alternating magnetic field was demonstrated to be ~3 Oe experimentally.
Keywords :
Sagnac interferometers; fibre optic sensors; magnetic field measurement; magnetic fluids; magneto-optical sensors; optical fibre cladding; refractive index; FF cladding; SMSLI transmission spectra shift; alternating magnetic field; compact optical magnetic field sensor; dip-wavelength; externally applied magnetic field intensity; ferrofluid; frequency 50 Hz; minimal detectable magnetic field strength; refractive index; single-mode microfiber Sagnac loop interferometer; transmission spectrum; wavelength 200 pm; Magnetic fields; Magnetic hysteresis; Magnetic liquids; Optical fiber sensors; Optical fibers; Optical interferometry; Sagnac interferometers; Micro-fiber sagnac loop interferometer; Microfiber sagnac loop interferometer; dip-wavelength; ferrofluid; magnetic field;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2462749
