Miniature optical fiber sensor for alternating magnetic fields based on In-BiCa vanadium iron garnet crystal

Author

Meng, Zhou ; Hu, Yongming ; Chen, Zhe ; Long, Xingwu

Author_Institution

Dept. of Appl. Phys., Nat. Univ. of Defence & Technol., Hunan, China

Volume

37

Issue

5

fYear

2001

fDate

9/1/2001 12:00:00 AM

Firstpage

3807

Lastpage

3809

Abstract

This paper introduces a high-sensitivity miniature optical fiber sensor for alternating magnetic fields based on the Faraday effect in bulk indium bismuth calcium vanadium iron garnet (In-BiCaVIG). It discusses the effects of the crystal´s magnetic hysteresis on the sensor in detail. Because of its construction, and the methods that reduce the effects of the hysteresis, the sensor has a noise-equivalent magnetic field of 10^-8 T/√(Hz) at 50 Hz and reaches an accuracy of 1% while the alternating magnetic field is changed from 0 to 45×10^-4 T over the temperature range from -20°C to 50°C. The sensing head is only 0.003 m×0.15 m in size

Keywords

Faraday effect; bismuth compounds; calcium compounds; fibre optic sensors; garnets; indium compounds; magnetic field measurement; magnetic hysteresis; magneto-optical sensors; vanadium compounds; -20 to 50 C; 0 to 45E-4 T; 50 Hz; Faraday effect; In-BiCa vanadium iron garnet crystal; InBiCaVFe5O12; InBiCaVIG; alternating magnetic field; magnetic hysteresis; optical fiber sensor; static operating point; Bismuth; Calcium; Faraday effect; Garnets; Indium; Iron; Magnetic hysteresis; Magnetic sensors; Optical fiber sensors; Temperature sensors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.952749

Filename

952749