Optical fiber Fabry-Perot interferometric sensor for magnetic field measurement

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 element...

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Published in:IEEE photonics technology letters 1997-06, Vol.9 (6), p.797-799
Main Authors: Ki Dong Oh, Ranade, J., Arya, V., Wang, A., Claus, R.O.
Format: Article
Language:English
Subjects:
Amorphous magnetic materials
Fabry-Perot interferometers
Iron
Magnetic field measurement
Magnetic sensors
Magnetostriction
Optical fiber sensors
Optical fibers
Optical interferometry
Transducers
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description 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.
doi_str_mv 10.1109/68.584994
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source IEEE Electronic Library (IEL) Journals
subjects Amorphous magnetic materials
Fabry-Perot interferometers
Iron
Magnetic field measurement
Magnetic sensors
Magnetostriction
Optical fiber sensors
Optical fibers
Optical interferometry
Transducers
title Optical fiber Fabry-Perot interferometric sensor for magnetic field measurement
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