Magnetic field strength measurement using tailored dispersion characteristics of phase-shifted fibre Bragg gratings

Philip Orr, Pawel Niewczas, Michael Stevenson, John Canning

Research output: Contribution to conferencePaper

Abstract

Magneto-optical activity giving rise to circular birefringence and Faraday rotation is not usually an appropriate basis for point measurement of magnetic field strength, acting as it must over extended lengths. In this paper we report on investigations into the dispersion characteristics of structured fibre Bragg gratings for the purposes of implementing novel polarimetric point sensors. Phase-shifts inscribed along the grating profile introduce windows in transmission that correspond to highly resonant wavelengths undergoing large group delay. We demonstrate through fabrication of structured gratings that their dispersion characteristics can be tailored, producing regions of spectrally co-located reflection and large group delay. Importantly, it is shown how a number of such regions can contribute to a single enhanced group delay in reflection. Through simulation we discuss the potential for implementing polarimetric magnetic field sensors which operate in reflection.

Conference

ConferenceFourth European Workshop on Optical Fibre Sensors
CountryPortugal
CityPorto
Period8/09/1010/09/10

Fingerprint

Bragg gratings
field strength
fibers
magnetic fields
gratings
optical activity
sensors
Faraday effect
birefringence
phase shift
fabrication
profiles
wavelengths
simulation

Keywords

  • Bragg gratings
  • dispersion
  • Faraday rotation

Cite this

Orr, P., Niewczas, P., Stevenson, M., & Canning, J. (2010). Magnetic field strength measurement using tailored dispersion characteristics of phase-shifted fibre Bragg gratings. Paper presented at Fourth European Workshop on Optical Fibre Sensors, Porto, Portugal. https://doi.org/10.1117/12.865456
Orr, Philip ; Niewczas, Pawel ; Stevenson, Michael ; Canning, John. / Magnetic field strength measurement using tailored dispersion characteristics of phase-shifted fibre Bragg gratings. Paper presented at Fourth European Workshop on Optical Fibre Sensors, Porto, Portugal.
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Orr, P, Niewczas, P, Stevenson, M & Canning, J 2010, 'Magnetic field strength measurement using tailored dispersion characteristics of phase-shifted fibre Bragg gratings' Paper presented at Fourth European Workshop on Optical Fibre Sensors, Porto, Portugal, 8/09/10 - 10/09/10, . https://doi.org/10.1117/12.865456

Magnetic field strength measurement using tailored dispersion characteristics of phase-shifted fibre Bragg gratings. / Orr, Philip; Niewczas, Pawel; Stevenson, Michael; Canning, John.

2010. Paper presented at Fourth European Workshop on Optical Fibre Sensors, Porto, Portugal.

Research output: Contribution to conferencePaper

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T1 - Magnetic field strength measurement using tailored dispersion characteristics of phase-shifted fibre Bragg gratings

AU - Orr, Philip

AU - Niewczas, Pawel

AU - Stevenson, Michael

AU - Canning, John

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N2 - Magneto-optical activity giving rise to circular birefringence and Faraday rotation is not usually an appropriate basis for point measurement of magnetic field strength, acting as it must over extended lengths. In this paper we report on investigations into the dispersion characteristics of structured fibre Bragg gratings for the purposes of implementing novel polarimetric point sensors. Phase-shifts inscribed along the grating profile introduce windows in transmission that correspond to highly resonant wavelengths undergoing large group delay. We demonstrate through fabrication of structured gratings that their dispersion characteristics can be tailored, producing regions of spectrally co-located reflection and large group delay. Importantly, it is shown how a number of such regions can contribute to a single enhanced group delay in reflection. Through simulation we discuss the potential for implementing polarimetric magnetic field sensors which operate in reflection.

AB - Magneto-optical activity giving rise to circular birefringence and Faraday rotation is not usually an appropriate basis for point measurement of magnetic field strength, acting as it must over extended lengths. In this paper we report on investigations into the dispersion characteristics of structured fibre Bragg gratings for the purposes of implementing novel polarimetric point sensors. Phase-shifts inscribed along the grating profile introduce windows in transmission that correspond to highly resonant wavelengths undergoing large group delay. We demonstrate through fabrication of structured gratings that their dispersion characteristics can be tailored, producing regions of spectrally co-located reflection and large group delay. Importantly, it is shown how a number of such regions can contribute to a single enhanced group delay in reflection. Through simulation we discuss the potential for implementing polarimetric magnetic field sensors which operate in reflection.

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Orr P, Niewczas P, Stevenson M, Canning J. Magnetic field strength measurement using tailored dispersion characteristics of phase-shifted fibre Bragg gratings. 2010. Paper presented at Fourth European Workshop on Optical Fibre Sensors, Porto, Portugal. https://doi.org/10.1117/12.865456