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Current sensing using Faraday rotation and a common path optical fiber heterodyne interferometer

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3 Author(s)
Bartlett, S.C. ; Physics Laboratory, University of Kent, Canterbury, Kent, United Kingdom ; Farahi, F. ; Jackson, D.A.

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An optical configuration for a current sensor utilizing the Faraday effect is described. A common path optical fiber heterodyne interferometer is used to greatly reduce noise produced by environmental effects. A miniature sensing element at the distal end of the fiber allows remote magnetic field or current measurements to be made. Solenoid generated magnetic fields over the range 0.7 to 10 μT, corresponding to solenoid currents from 10 to 150 mA, have been detected over a frequency range from 25 to 125 Hz with a linear response.

Published in:

Review of Scientific Instruments  (Volume:61 ,  Issue: 9 )