Temperature-insensitive Sagnac-type optical current transformer

Kin'ichi Sasaki; Masao Takahashi; Yukihisa Hirata

doi:10.1117/12.2058754

2 June 2014 Temperature-insensitive Sagnac-type optical current transformer

Kin'ichi Sasaki, Masao Takahashi, Yukihisa Hirata

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91571Z (2014) https://doi.org/10.1117/12.2058754
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

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 above 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°C to 80°C was within 0.1%, and satisfied the required accuracy for IEC 60044-8 class 0.2S.

Citation Download Citation

Kin'ichi Sasaki, Masao Takahashi, and Yukihisa Hirata "Temperature-insensitive Sagnac-type optical current transformer", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91571Z (2 June 2014); https://doi.org/10.1117/12.2058754

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