Toshihiko YOSHINO, Yoshitaka TAKAHASHI and Mikihiko GOJYUKI

Department of Electronic Engineering, Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma, 376 Japan

(Received July 1, 1996; Accepted September 12, 1996)

Theoretical analysis of measurement errors caused by the imperfection of the sensing optical loop in a glass block Faraday effect current sensor has been presented. The experimental results with the fabricated sensor which was designed to achieve a closed homogeneous and isotropic optical path show the importance of the perfectly isotropic and closed loop, in accordance with the theoretical consideration.

Key words : Faraday effect, Ampere's law, optical sensing, current sensor, thin film, dielectric coating