ABSTRACT
This chapter explains the basic set-up of polarimetric Faraday magneto-optic field sensors and reviews early attempts to apply such sensors to the measurement of high voltage currents. The integration of these sensors into a magnetic core that encloses the current conductor enhances their sensitivity to current and reduces the sensibility to position and crosstalk from neighbor currents. This chapter discusses criteria for the choice of the core material, core structure, and geometrical proportions to limit hysteresis and eddy current loss and control the saturation magnetic field. Various current sensor configurations employing a magnetic core are discussed.
