Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1996-11-06
1997-10-14
Nguyen, Vinh P.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
356351, G01R 3100
Patent
active
056776225
ABSTRACT:
A current sensor which makes use of the Faraday effect, which is patterned on a Sagnac interferometer and which employs a coil of spun birefringent optical fibre for sensing the magnitude of current flowing through a conductor about which the sensor is, in use, located. The sensor in its preferred form comprises a coil (1) of spun single mode birefringent optical fibre (11), the coil being arranged to locate about a conductor (12) through which current flow occurs. A beam splitting device (22) in the form of a 3*3 coupler is coupled with the ends of the coil fibre and is arranged to launch counter-propagating light beams into the respective ends of the coil fibre. A lasing light source (16) is optically coupled to the beam splitting device by way of a 2*2 coupler (21), and detectors (18) which are arranged to detect a phase shift between the polarisation modes of the counter-propagated light beams are optically coupled to the ends of the coil fibre by way of the beam splitting device.
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Optics Letters, vol. 13, No. 10, Oct. 1988, Washington US pp. 844-846, Bassett "Design Principle for a Circularly Birefringent Optical Firbre".
Revue Generale de l'Electricite, No. 4, Apr. 1990, Paris FR Royer et al. "Capteur de Courant a Fibre Optique" pp. 62-67.
IEEE Transactions on Instrumentation and Measurement, vol. 39, No. 1, Jan. 1990, New York, U.S., Nicati et al. "Numerical Analysis of Second Order Polarization . . . ", pp. 219-224.
Kobert Russell M.
Nguyen Vinh P.
The University of Sydney
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