OPTICAL FIBER ELECTRIC CURRENT SENSOR AND ELECTRIC CURRENT MEASUREMENT METHOD
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United States of America Patent
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Issued Date -
Oct 7, 2010
app pub date -
Apr 24, 2008
filing date -
Oct 23, 2007
priority date (Note) -
Abandoned
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Abstract
An optical fiber electric current sensor includes a polarization splitter (13) that splits output light from a sensor fiber (11) into two polarization components of which polarization planes intersect with each other; and a signal processing unit (15) that converts the two split polarization components into first and second signals (Px) and (Py) by opto-electric conversion, multiplies a ratio (Sx) between direct current component and alternating current component of the first signal (Px) and a ratio (Sy) between direct current component and alternating current component of the second signal (Py) by different coefficients, and calculates a difference value therebetween.
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