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A Magnetostrictive Composite-Fiber Bragg Grating Sensor
Department of Mechanical Engineering, Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, Gávea 22453-900, Rio de Janeiro, RJ, Brazil
Department of Physics, Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, Gávea 22453-900, Rio de Janeiro, RJ, Brazil
* Author to whom correspondence should be addressed.
Received: 10 July 2010; in revised form: 30 July 2010 / Accepted: 15 August 2010 / Published: 30 August 2010
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
Keywords: magnetic field sensor; fiber Bragg grating; magnetostrictive composite
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Quintero, S.M.M.; Braga, A.M.B.; Weber, H.I.; Bruno, A.C.; Araújo, J.F.D.F. A Magnetostrictive Composite-Fiber Bragg Grating Sensor. Sensors 2010, 10, 8119-8128.
Quintero SMM, Braga AMB, Weber HI, Bruno AC, Araújo JFDF. A Magnetostrictive Composite-Fiber Bragg Grating Sensor. Sensors. 2010; 10(9):8119-8128.
Quintero, Sully M.M.; Braga, Arthur M.B.; Weber, Hans I.; Bruno, Antonio C.; Araújo, Jefferson F.D.F. 2010. "A Magnetostrictive Composite-Fiber Bragg Grating Sensor." Sensors 10, no. 9: 8119-8128.