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A novel optical element for a bulk glass current sensor that utilizes the Faraday effect is presented with a demonstrated sensitivity of 1 amp-turn and a flat frequency response in the range of 10-10(4) Hz. The new sensing element overcomes the problems associated with birefringence in optical fiber current sensors and the requirement to make bulk-optic current sensors in complex three-dimensional topologies.

A new triangular topology for a bulk-optic Faraday current sensor is presented with a demonstrated resolution of 20 mA/ radicalHz over a measurement range of 1 to 3000 A. The sensitivity of the system is 2.35 x 10(-5)rad/A. This sensor is relatively easy to fabricate and overcomes problems encountered with the use of current sensors based on bulk-optic square configurations and all-fiber systems.