Title :
Optical fiber Fabry-Perot interferometric sensor for magnetic field measurement
Author :
Oh, Ki Dong ; Ranade, Jaydeep ; Arya, Vivek ; Wang, Anbo ; Claus, Richard O.
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
A fiber-optic sensor based on the extrinsic Fabry-Perot interferometer (EFPI) is demonstrated to measure dc magnetic fields (100-35000 nT). A Metglas (Fe/sub 77.5/B/sub 15/Si/sub 7.5/) wire-based magnetostrictive transducer is used as the reflector in two quadrature-phase-shifted EFPI sensor elements which are used to overcome phase ambiguity in the interferometric sensor. The simple sensor geometry gives both relatively low-vibration sensitivity and better than 99% compensation for thermally induced fluctuations.
Keywords :
Fabry-Perot interferometers; amorphous magnetic materials; compensation; fibre optic sensors; magnetic field measurement; magneto-optical sensors; magnetostrictive devices; metallic glasses; optical fibres; quadrature phase shift keying; 100 to 35000 nT; Fe/sub 77.5/B/sub 15/Si/sub 7.5/; Metglas wire-based magnetostrictive transducer; dc magnetic fields; extrinsic Fabry-Perot interferometer; low-vibration sensitivity; magnetic field measurement; optical fiber Fabry-Perot interferometric sensor; phase ambiguity; quadrature-phase-shifted EFPI sensor elements; temperature compensation; thermally induced fluctuations; Amorphous magnetic materials; Fabry-Perot interferometers; Iron; Magnetic field measurement; Magnetic sensors; Magnetostriction; Optical fiber sensors; Optical fibers; Optical interferometry; Transducers;
Journal_Title :
Photonics Technology Letters, IEEE
