Method and apparatus for optically measuring electric current an

Details Method and apparatus for optically measuring electric current an Method and apparatus for optically measuring electric current an

1994-08-29

1995-05-16

Bovernick, Rodney B.

Optical waveguides

Optical waveguide sensor

324 96, 25022717, 25022721, 356345, 356351, 385 11, G01R 1507

Patent

active

054168600

ABSTRACT:
A system for measuring the strength of fiber optical current in an AC magnetic field by adopting Faraday effect and temperature compensation. In general, the current measurement systems that adopt Faraday effect have the structure including a Faraday element, a polarizer and an analyzer. When a light beam is directed through the Faraday element, the plane of polarization rotates according to the strength of induced magnetic field and Verdet constant in the Faraday element. The rotation affects the optical intensity sensed by the analyzer. The variation on light intensity after passing through the analyzer is converted into an electric current by a optical-electric transducer. But the accuracy of this system this system always affected by the ambient environment, wherein the major factor is the thermal effect of Verdet constant. This invention utilizes thermo-optical sensing device to sense the temperature variation in Faraday element, and furthermore utilizes the sensed variation as means of compensation to regulate the process of current measurement so that will not be affected by ambient temperature.

REFERENCES:
patent: 4675522 (1987-06-01), Arunkumar
patent: 4929050 (1990-05-01), Wilson
patent: 4988212 (1991-01-01), Sun et al.
patent: 5021647 (1991-06-01), Tatsuno et al.

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