Fiber optic measuring system for electric current by using a magnetooptic sensor

Author

Kyuma, Kazuo ; Tai, Shuichi ; Nunoshita, Masahiro ; Takioka, Takashi ; Ida, Yoshiaki

Author_Institution

Mitsubishi Electric Corporation, Advanced Technology Research and Development Center, Itami, Hyogo, Japan

Volume

18

Issue

10

fYear

1982

fDate

10/1/1982 12:00:00 AM

Firstpage

1619

Lastpage

1623

Abstract

A practical fiber optic measuring system for heavy electric current was developed by using the magnetooptic (Faraday) material. In order to obtain better SNR and smaller temperature dependence, the most suitable combination of the light source and Faraday material was experimentally and theoretically determined. Consequently, it was emphasized that an LED and diamagnetic SF-6 flint glass gave the superiority of overall system capability over LD´s and para- or ferromagnetics. A novel type of fiber optic current sensor was constructed of the Faraday rotator of SF-6 flint glass with two thin-film polarizers. By using this sensor and a high radiance LED, high accuracy within ±0.5 percent was obtained for magnetic field between 20 and 500 Oe, and at temperatures from -25°C up to 80°C.

Keywords

Current measurement; Faraday effect; Optical fiber transducers; Current measurement; Electric variables measurement; Light emitting diodes; Magnetic materials; Magnetic sensors; Optical fiber sensors; Optical fibers; Optical materials; Optical sensors; Sensor systems;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.1982.1071442

Filename

1071442