Abstract

Highly accurate optical magnetic-field probe sensors that use iron garnet films have been developed. New probe-type sensors were designed with a confocal optical system. A new garnet composition, Bi_0.98Gd_0.92La_0.03Y_1.07Fe_4.72Ga_0.28O₁₂, was found that shows high temperature stability for a sensitivity of less than 2.0% from -20 to +80 °C. The linearity error of the sensor output was within 1.0% for alternating magnetic fields from 0.3 to 42 mT. An optical current transformer that uses the proposed sensor has an ac linearity of 1.0% for input current up to nearly 300 A. The sensor realized high performance in actual use.

© 1999 Optical Society of America

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