[OPTICAL REVIEW Vol. 4, No. 1A (1997) 96-98]

Temperature-Disturbance Free Magnetic Field Sensor Based on Double Fiber Optic Polarimetry

Satoshi TANAKA, Masahiro MURAKAWA and Yoshihiro OHTSUKA

Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo, 060 Japan

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

A double fiber-optic Mach-Zehnder interferometer for sensing magnetic fields is devised using two polarization maintaining single-mode fibers. This sensor achieves not only highly sensitive performance but also excellent immunity from temperature disturbance. The sensitivity attains 243 deg/mT (mT=10-3N/A) for the sensing part of the 5 cm long fiber.

Key words : magnetic-field sensor, double fiber-optic heterodyne polarimetry, immunity from temperature disturbance, polarization maintaining-single mode fiber, magnetostrictive sensor