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Fiber-linked Faraday effect current sensor by use of a flint glass cell with dielectric-coated
Toshihiko Yoshino1, Masayuki Yokota, Katsugo Aoki
1Department of Electronic Engineering, Faculty of Engineering, Gunma University, Kiryu, Japan. yoshinot@educet.plala.or.jp
Abstract:
A new type of Faraday effect optical current transformer has been developed that uses a single block of square flint glass with dielectric-coated total reflection surfaces as the sensing element. Numerical calculation has shown that the coating of two dielectric layers of 45.59-nm-thick Ta2O5 and 448.35-nm-thick SiO2 films on a flint glass surface produces zero retardation total reflection for the 45 degrees incident angle of light at lambda = 840 nm with great incident angle, wavelength, and film thickness tolerances. A fiber-linked current transformer has been constructed and experimentally demonstrated to exhibit high isolation from surrounding currents as well as high stability against mechanical disturbances.