Magnetic Field Sensor Based on U-Bent Single-Mode Fiber and Magnetic Fluid

Author

Tiegen Liu ; Yaofei Chen ; Qun Han ; Xiaoying Lu

Author_Institution

Coll. of Precision Instrum. & Opto-Electron. Eng., Tianjin Univ., Tianjin, China

Volume

6

Issue

6

fYear

2014

fDate

Dec. 2014

Firstpage

1

Lastpage

7

Abstract

In this paper, an all-fiber magnetic field sensor based on a U-bent single-mode fiber and magnetic fluid (MF) is proposed and investigated. Because of the tunable refractive index and absorption coefficient of MF, the transmission spectrum will change with the magnetic field strength (H), which can be used to demodulate H through the wavelength shift or the intensity change. The influence of the diameter of the U shape to the performance of the sensor is investigated and discussed. In the experiments, the highest sensitivities achieved with wavelength and intensity demodulation are 0.374 nm/Oe and -0.4821 dB/Oe, respectively. The reproducibility of the sensor is studied as well.

Keywords

absorption coefficients; fibre optic sensors; intensity modulation; magnetic field measurement; magnetic fluids; magnetic sensors; optical tuning; refractive index; U-bent single-mode fiber; absorption coefficient; all-fiber magnetic field sensor; intensity change; magnetic field strength; magnetic fluid; transmission spectrum; tunable refractive index; wavelength shift; Magnetic fields; Magnetic liquids; Magnetostriction; Optical fiber sensors; Optical fibers; Sensitivity; Temperature sensors; Optical fiber sensors; bent single mode fiber; magnetic field sensing; magnetic fluids;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2014.2368781

Filename

6951405