Abstract
Due to their intrinsically favourable behaviour with respect to electromagnetic interference and galvanic isolation, fibre optic sensors are good candidates for current and magnetic field measurements in high power electric transmission systems. Sensors utilizing the magneto-optic Faraday effect have been investigated for a number of years. When looking for a compact design, magnetooptical garnet materials such as YIG (Yttrium Iron Garnet, Y3Fe5O12) or preferably substituted YIG have shown promising properties. 1,2,3,4 One common advantage of these materials is their large Faraday rotation, up to 2000°/cm for Bisubstituted YIG.
© 1992 Optical Society of America
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