Temperature-Insensitive Sagnac-Type Optical Current Transformer

Author

Sasaki, Kinichi ; Takahashi, Masao ; Hirata, Yukihisa

Author_Institution

Power & Ind. Syst. R&D Center, Toshiba Corp., Tokyo, Japan

Volume

33

Issue

12

fYear

2015

fDate

June15, 15 2015

Firstpage

2463

Lastpage

2467

Abstract

We estimated the influence of polarization crosstalk in a Sagnac-type optical current transformer (OCT) against sensor sensitivity, and confirmed that temperature dependence of Faraday effect is canceled out by controlling the extinction ratio of transmission fiber with temperature change. Based on the evaluation, we developed a temperature compensation element (TCE) consisting of metal-coated PM fiber. Its extinction ratio varies with temperature because of the difference between the linear expansions of metal and fiber. The ratio error of OCT using this TCE in the temperature range from -40 to 80 °C was within 0.1%, and satisfied the required accuracy for IEC 60044-8 class 0.2S for ac applications and IEC 61869-14 class 0.2 for dc applications.

Keywords

Faraday effect; fibre optic sensors; magneto-optical sensors; optical crosstalk; optical fibre polarisation; Faraday effect; IEC 60044-8 class 0.2S; IEC 61869-14 class 0.2; ac applications; dc applications; extinction ratio; metal-coated PM fiber; polarization crosstalk; sensor sensitivity; temperature -40 degC to 80 degC; temperature compensation element; temperature dependence; temperature-insensitive Sagnac-type optical current transformer; transmission fiber; Extinction ratio; Optical fiber couplers; Optical fiber polarization; Optical fiber sensors; Phase modulation; Temperature sensors; Crosstalk; Faraday effect; Sagnac; Verdet constant; crosstalk; current measurement; extinction ratio; optical fiber devices; temperature compensation;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2014.2366207

Filename

6949600