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Sensors 2010, 10(9), 8119-8128; doi:10.3390/s100908119

A Magnetostrictive Composite-Fiber Bragg Grating Sensor

1,* , 1
Received: 10 July 2010 / Revised: 30 July 2010 / Accepted: 15 August 2010 / Published: 30 August 2010
(This article belongs to the Special Issue Advanced Embedded Sensors)
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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 magnetic field sensor; fiber Bragg grating; magnetostrictive composite
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

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