A distributed optical fiber sensor is introduced which is capable of quantifying multiple magnetic fields along a 1 km sensing fiber with a spatial resolution of 1 m. The operation of the proposed sensor is based on measuring the magnetorestrictive induced strain of a nickel wire attached to an optical fiber. The strain coupled to the optical fiber was detected by measuring the strain-induced phase variation between the backscattered Rayleigh light from two segments of the sensing fiber. A magnetic field intensity resolution of 0.3 G over a bandwidth of 50–5000 Hz was demonstrated.
© 2014 Optical Society of America
Remote Sensing and Sensors
Original Manuscript: January 22, 2014
Revised Manuscript: March 20, 2014
Manuscript Accepted: March 29, 2014
Published: April 24, 2014
Ali Masoudi and Trevor P. Newson, "Distributed optical fiber dynamic magnetic field sensor based on magnetostriction," Appl. Opt. 53, 2833-2838 (2014)