[OPTICAL REVIEW Vol. 4, No. 1A (1997) 38-44]

Optical Current Transducers Using Flint Glass Fiber as the Faraday Sensor Element


Power Engineering R&D Center, Tokyo Electric Power Co., Inc., 4-1 Egasaki-cho, Tsurumi-ku, Yokohama, 230 Japan

(Received September 9, 1996; Accepted September 20, 1996)

This paper describes development of the optical current transducers using flint glass fiber as the Faraday effect sensing element. Excellent polarization properties of the fiber with low birefringence are described, and the design and test data of a current transducer using the fiber manufactured for use in electric power facilities are reviewed. Experimental results on flexible characteristics of a scheme with round trip light transmission in the fiber is also reported.

Key words : current, optical fiber, flint glass, Faraday effect, photo-elastic effect, sensor, transducer