Faraday-effect current sensor with improved sensitivity-bandwidth product

Kent B. Rochford; Allen H. Rose; Merritt N. Deeter; Gordon W. Day

doi:10.1117/12.185076

14 September 1994 Faraday-effect current sensor with improved sensitivity-bandwidth product

Kent B. Rochford, Allen H. Rose, Merritt N. Deeter, Gordon W. Day

Proceedings Volume 2360, Tenth International Conference on Optical Fibre Sensors; (1994) https://doi.org/10.1117/12.185076
Event: 10th Optical Fibre Sensors Conference, 1994, Glasgow, United Kingdom

Abstract

We report a new design for a Faraday effect current sensor based on yttrium iron garnet. The improved sensor has substantially greater bandwidth than previous designs and is considerably easier to fabricate. The measured sensitivity is 0.7°/A with a -3 dB bandwidth of 500 MHz, giving a factor of 45 increase in sensitivity-bandwidth product. A noise-equivalent current of 840 nA/Hzl/2 was measured at 1.8 kHz using difference-over-sum processing. The use of newly developed turning prisms with phasepreserving coatings greatly simplifies construction, improves electrical isolation, and increases sensitivity through proximity effects.

Citation Download Citation

Kent B. Rochford, Allen H. Rose, Merritt N. Deeter, and Gordon W. Day "Faraday-effect current sensor with improved sensitivity-bandwidth product", Proc. SPIE 2360, Tenth International Conference on Optical Fibre Sensors, (14 September 1994); https://doi.org/10.1117/12.185076

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