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Proceedings Paper

Faraday-effect current sensor with improved sensitivity-bandwidth product
Author(s): Kent B. Rochford; Allen H. Rose; Merritt N. Deeter; Gordon W. Day
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Paper 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.

Paper Details

Date Published: 14 September 1994
PDF: 4 pages
Proc. SPIE 2360, Tenth International Conference on Optical Fibre Sensors, (14 September 1994); doi: 10.1117/12.185076
Show Author Affiliations
Kent B. Rochford, National Institute of Standards and Technology (United States)
Allen H. Rose, National Institute of Standards and Technology (United States)
Merritt N. Deeter, National Institute of Standards and Technology (United States)
Gordon W. Day, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 2360:
Tenth International Conference on Optical Fibre Sensors
Brian Culshaw; Julian D. C. Jones, Editor(s)

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