1 November 1994 Faraday effect sensors for magnetic field and electric current
Author Affiliations +
Recent research at NIST has greatly extended the capabilities of Faraday effect sensors for both magnetic field and electric current measurements. Current sensors using single-mode optical fiber show temperature stability near material limits, and are approaching commercial availability for application in the power industry. The Faraday effect in iron garnets shows great promise for measuring current at low levels and/or high speeds. Sensors with noise equivalent currents of about 200 nA/(root)Hz have been demonstrated. Magnetic field sensors using iron garnets and flux concentration, have led to sensors with noise equivalent magnetic fields in the range of 1 pT/(root)Hz.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gordon W. Day, Gordon W. Day, Merritt N. Deeter, Merritt N. Deeter, Allen H. Rose, Allen H. Rose, Kent B. Rochford, Kent B. Rochford, "Faraday effect sensors for magnetic field and electric current", Proc. SPIE 2292, Fiber Optic and Laser Sensors XII, (1 November 1994); doi: 10.1117/12.191859; https://doi.org/10.1117/12.191859


Optical wheel-rotation sensor
Proceedings of SPIE (September 13 1994)
Low Cost Binary Proximity Sensor For Automotive Applications
Proceedings of SPIE (February 12 1990)

Back to Top