Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 25, 2011
Patent Application Number
12245073
Date Filed
October 3, 2008
Patent Primary Examiner
Patent abstract
To measure a sum of electrical currents in different conductors, light is led in an optical sensing fiber around all the conductors. The sensing fiber can be wound around the conductors in a single loop or in several individual loops. Interspersed polarization maintaining fibers and retarders can be used to transfer the light between individual loops for preventing undesired signals from stray magnetic fields. The method has high accuracy is particularly suited for measuring large currents that sum up to zero.
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