title: A magnetostrictive composite-fiber Bragg Grating sensor.
abstract: This paper presents a light and compact optical fiber Bragg Grating sensor for DC and AC magnetic field measurements. The fiber is coated by a thick layer of a magnetostrictive composite consisting of particles of Terfenol-D dispersed in a polymeric matrix. Among the different compositions for the coating that were tested, the best magnetostrictive response was obtained using an epoxy resin as binder and a 30% volume fraction of Terfenol-D particles with sizes ranging from 212 to 300 μm. The effect of a compressive preload in the sensor was also investigated. The achieved resolution was 0.4 mT without a preload or 0.3 mT with a compressive pre-stress of 8.6 MPa. The sensor was tested at magnetic fields of up to 750 mT under static conditions. Dynamic measurements were conducted with a magnetic unbalanced four-pole rotor.
authors.affiliation: Department of Mechanical Engineering, Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, Gávea 22453-900, Rio de Janeiro, Brazil. sully@aluno.puc-rio.br
authors.forename: Sully M M
authors.initials: SM
authors.lastname: Quintero
authors.forename: Arthur M B
authors.initials: AM
authors.lastname: Braga
authors.forename: Hans I
authors.initials: HI
authors.lastname: Weber
authors.forename: Antonio C
authors.initials: AC
authors.lastname: Bruno
authors.forename: Jefferson F D F
authors.initials: JF
authors.lastname: Araújo
mesh_terms: D004853:Epoxy Resins / Q000737:chemistry*; D005336:Fiber Optic Technology / Q000295:instrumentation*; D060526:Magnetic Fields; D059346:Magnets / Q000737:chemistry*; D055100:Optical Fibers; D010316:Particle Size; D011140:Polyurethanes / Q000737:chemistry; D055672:Static Electricity
chemical_list: D004853:Epoxy Resins; D011140:Polyurethanes