Triaxial Fiber Optic Magnetic Field Sensor for Magnetic Resonance Imaging

M.L. Filograno, M. Pisco, A. Catalano, E. Forte, M. Aiello, C. Cavaliere, A. Soricelli, D. Davino, C. Visone, A. Cutolo, A. Cusano

Research output: Contribution to journalArticlepeer-review


We present a fiber optic magnetic field sensor conceived for magnetic resonance imaging (MRI) applications. The sensor is based on the integration of fiber optic strain sensors (fiber Bragg gratings-FBGs) with a sensing material (Terfenol-D). The response of an FBG integrated with a block of Terfenol-D was preliminarily investigated by taking into account the dependence of the Terfenol-D magnetostrictive response on both the longitudinal and transversal magnetic fields, with different preloads. Based on the performed characterizations, a triaxial magnetic field sensor was designed, characterized, and fabricated. An algorithm enabling the demodulation of the magnetic field from the readout of the three FBGs was also implemented, by taking into account the interdependence among the different sensor responses. Experimental results demonstrate the ability of the triaxial sensor to measure the magnetic field. Performance assessment and critical analysis are reported as well, elucidating both the abilities and limitations of the implemented sensing configuration. Finally, as proof of principle, a sensing system constituted of 20 triaxial sensors has been fabricated and used to map the magnetic field strength distribution in an MRI diagnostic centre. © 2017 IEEE.
Original languageEnglish
Pages (from-to)3924-3933
Number of pages10
JournalJournal of Lightwave Technology
Issue number18
Publication statusPublished - Jul 3 2017


  • Fibre Bragg grating
  • magnetic resonance imaging
  • optical fibre sensor
  • Terfenol-D
  • triaxial magnetic sensor
  • Fiber optic sensors
  • Fiber optics
  • Fibers
  • Magnetic field measurement
  • Magnetic fields
  • Magnetic resonance imaging
  • Magnetic sensors
  • Magnetism
  • Magnetometers
  • Magnetostriction
  • Optical fiber fabrication
  • Optical fibers
  • Resonance
  • Sensors
  • Critical analysis
  • Fiber gratings
  • Magnetic field sensors
  • Magnetic field strengths
  • Performance assessment
  • Proof of principles
  • Sensing configuration
  • Triaxial magnetic fields
  • Fiber Bragg gratings


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