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Optical fibre Faraday rotation current sensor with closed-loop operation

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2 Author(s)
A. D. Kersey ; Naval Research Laboratory, Washington, USA ; A. Dandridge

A novel closed-loop fibre-optic current sensor based on the Faraday effect is described which maintains a constant sensitivity to AC currents in the presence of large quasi-DC and low-frequency current fluctuations. A Verdet constant of 2.55×10¿6 rad/A (at 0.83 ¿m) is reported for the fibre used.

Published in:

Electronics Letters  (Volume:21 ,  Issue: 11 )