6533b837fe1ef96bd12a273e
RESEARCH PRODUCT
Passive interferometric interrogation of a magnetic field sensor using an erbium doped fiber optic laser with magnetostrictive transducer
Miguel V. AndrésJosé BaptistaPedro A. S. JorgeI. M. NascimentoJose Luis Cruzsubject
Materials sciencebusiness.industryMetals and Alloyschemistry.chemical_elementPhysics::OpticsFísicaMagnetostrictionOutput couplerCondensed Matter PhysicsLaserSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsMagnetic fieldlaw.inventionErbiumInterferometryOpticsTransducerchemistrylawFiber laserElectrical and Electronic EngineeringbusinessInstrumentationdescription
Abstract An erbium doped (Er3+) fiber optic laser is proposed for magnetic field measurement. A pair of FBGs glued onto a magnetostrictive material (Terfenol-D rod) modulates the laser wavelength operation when subject to a static or a time dependent magnetic field. A passive interferometer is employed to measure the laser wavelength changes due to the applied magnetic field. A data acquisition hardware and a LabVIEW software measure three phase-shifted signals at the output coupler of the interferometer and process them using two distinct demodulation algorithms. Results show that sensitivity to varying magnetic fields can be tuned by introducing a biasing magnetic field. A maximum error of 0.79% was found, for magnetic fields higher than 2.26 mTRMS.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-11-01 |