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We present a ruggedized portable fiber-optic Faraday-rotation current
sensor, that exhibits good and stable performance characteristics. The
sensor has been tested and calibrated against a commercial induction-coil
type device. The resultant scale-factor is in a very good agreement with
the theoretical one, calculated following extensive fiber birefringence
measurements. The measured sensor noise equivalent current is
0.23Amp/Vi.
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Ehud Shafir, Amit Ben-kish, Naim Konforti, Moshe Tur, "Portable fiber optic current sensor," Proc. SPIE 1442, 7th Mtg in Israel on Optical Engineering, (1 April 1991); https://doi.org/10.1117/12.49066