Fiber optic transducer for measuring current or ma

专利名称：Fiber optic transducer for measuring current

or magnetic field

发明人：Gregory L. Tangonan,Robert J.

Morrison,Joseph A. Wysocki,David L.Persechini

申请号：US06/207107申请日：19801117公开号：US04348587A公开日：19820907

摘要：A multi-mode optical fiber is used to detect electrical currents or magneticfields from a remote source. The optical fiber, which serves as the sensor, is compositedwith metal capable of conducting electricity. Optical radiation is introduced into the fiberfrom a source which may be either coherent or incoherent. An electrical current is appliedto the portion of the electrically conducting optical fiber and a magnetic field is appliedto the current-carrying optical fiber. A known value of one permits a determination of thepresence or absence of the other through electromotive forces on a metallic conductorin a magnetic field, which are used to induce differential phase shifts (coherent opticalradiation input) or losses (incoherent optical radiation input) between the fiber modes.These phase shifts or losses are detected by a suitable detector. For a magnetic field of 1kGauss, good linearity is obtained in the 5 to 2,000 mA current range. Magnetic fields ofabout 0.1 G to 1 kG are detected employing a current source of about 5 mA to 50 A.

申请人：HUGHES AIRCRAFT COMPANY

代理人：David W. Collins,W. H. MacAllister

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