Optical magnetic field sensor capable of precise measurement wit

Details Optical magnetic field sensor capable of precise measurement wit Optical magnetic field sensor capable of precise measurement wit

1993-02-02

1995-01-17

Wieder, Kenneth A.

Electricity: measuring and testing

Magnetic

Magnetometers

324 96, 250225, G01R 3100, G01R 3302, G02B 530

Patent

active

053829018

ABSTRACT:
An optical magnetic field sensor is provided that can precisely measure a magnetic field strength without measuremental errors caused by temperature change. The sensor includes a light source, a polarizer, a Faraday's element, an analyzer, a first light beam-receiving element, a first calculation circuit, a second light beam-receiving element, a second calculation circuit, and a third calculation circuit, wherein the light beam emitted from the light source is passed through the polarizer, the Faraday's element and the analyzer in sequence, an S polarized light beam after passed through the analyzer is passed through the first light beam-receiving element, an output signal therefrom is calculated in the first calculation circuit, a P polarized light beam after passed through the analyzer is passed through the second light beam-receiving element, an output signal therefrom is calculated in the second calculation circuit, the third calculation circuit is supplied with the outputs V.sub.11 and V.sub.22 from the first and second calculation circuits respectively to obtain an output V.sub.3 based on specific equations, and a magnetic field strength is obtained from the output V.sub.3 of the third calculation circuit.

REFERENCES:
patent: 4531092 (1985-07-01), Shibano
patent: 4581579 (1986-04-01), Nagatsuma et al.
patent: 4973899 (1990-11-01), Jones et al.
IEEE Trans. on Power Delivery, vol. 2, No. 1, Jan. 1987, US pp. 87-93, T. Mitsui et al. "Development of Fiber-Optic Voltage Sensors and Magnetic-Field Sensors."
IEEE Trans. on Power Delivery, vol. 5, No. 2, Apr. 1990, US pp. 892-898, E. A. Ulmer, "A High-Accuracy Optical Current Transducer for Electric Power Systems."
Applied Optics, vol. 28, No. 11, Jun. 1989, New York US, pp. 2001-2011, K. S. Lee "New Compensation Method for Bulk Optical Sensors with Multiple Birefringences".

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