Experimental Study of Some Key Issues on Fiber-Optic Interferometric Sensors Detecting Weak Magnetic Field

Author

Wang, Xin ; Chen, Shuying ; Du, Zhigang ; Wang, Xiaoyang ; Shi, Changhai ; Chen, Jianping

Author_Institution

State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Shanghai Jiao Tong Univ., Shanghai

Volume

8

Issue

7

fYear

2008

fDate

7/1/2008 12:00:00 AM

Firstpage

1173

Lastpage

1179

Abstract

This paper presents some key issues in fiber-optic interferometric magnetic field sensors. Practically applicable methods to design and implement fiber-optic Michelson interferometer and transducers are described with experimental verifications. Detection scheme of traditional hardware demodulation is improved, and a new software demodulation method is addressed. Transducers were implemented by using the proposed methods and the performance was tested. The results show significant performance improvement. The minimum detectable magnetic field using hardware demodulation scheme is about 0.10 nT/Hz^1/2 at 1 Hz without any mumetal shield in the laboratory environment.

Keywords

Michelson interferometers; demodulation; fibre optic sensors; magnetic field measurement; magnetic sensors; optical design techniques; optical modulation; optical testing; Michelson interferometer; fiber-optic interferometric sensor; hardware demodulation scheme; software demodulation method; transducer performance testing; weak magnetic field detection; Demodulation; Magnetic field measurement; Magnetic sensors; Magnetic shielding; Magnetostriction; Optical fiber polarization; Optical fiber sensors; Optical fiber testing; Optical interferometry; Transducers; Fiber-optic interferometric magnetic field sensor; resolution; sensitivity; stability;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2008.926887

Filename

4567504