Faraday-effect current sensor with improved vibration response
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United States of America Patent
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Mar 9, 2004
Grant Date -
Dec 5, 2002
app pub date -
Feb 28, 2001
filing date -
Feb 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is directed to a Faraday-type current sensor which is less susceptive to effects caused by rotation, acceleration and vibration of the sensor coil. The sensor coil of the invention includes a first coil section which forms the current sensing coil and a second coil section which is optically connected to the first coil section and forms a compensation or 'bucking' coil. The optical fiber of the first coil section preferably has an almost zero birefringence and is connected in series with the optical fiber of the second coil section which preferably has a large birefringence. The illuminating radiation propagates through the sensor coil in such a way, as viewed along the coil axis, that the propagation direction of the radiation in the first coil section with respect to the coil axis is opposite from the propagation direction in the second coil section.
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