title: Fiber-linked Faraday effect current sensor by use of a flint glass cell with dielectric-coated retardation-compensated total reflection surfaces.
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.
authors.affiliation: Department of Electronic Engineering, Faculty of Engineering, Gunma University, Kiryu, Japan. yoshinot@educet.plala.or.jp
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Yoshino
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yokota
authors.forename: Katsugo
authors.initials: K
authors.lastname: Aoki
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Shun
authors.initials: S
authors.lastname: Itoi
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Ohtaka