Fiber optic transducer for measuring current or magnetic field

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