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Magneto-optic current sensor

United States Patent

October 7, 2003
View the Complete Patent at the US Patent & Trademark Office
Argonne National Laboratory - Visit the Technology Development and Commercialization Website
An optical current transducer configured to sense current in the conductor is disclosed. The optical current transducer includes a light source and a polarizer that generates linearly polarized light received from a the light source. The light is communicated to a magneto-optic garnet that includes, among other elements, bismuth, iron and oxygen and is coupled to the conductor. The magneto-optic garnet is configured to rotate the polarization of the linearly polarized light received from the polarizer. The optical current transducer also includes an analyzer in optical communication with the magneto-optic garnet. The analyzer detects the rotation of the linearly polarized light caused by the magneto-optic garnet.
Lanagan; Michael T. (State College, PA), Valsko-Vlasov; Vitalii K. (Downers Grove, IL), Fisher; Brandon L. (Bolingbrook, IL), Welp; Ulrich (Lisle, IL)
The University of Chicago (Chicago, IL)
09/ 790,961
February 22, 2001
SPONSORED RESEARCH OR DEVELOPMENT The invention was made with U.S. Government support under contract no. W-31-109-ENG-38 awarded by the Department of Energy and the U.S. Government has certain rights in this invention.