A Magnetostrictive Composite-Fiber Bragg Grating Sensor

Author： Quintero Sully M. M. Braga Arthur M. B. Weber Hans I. Bruno Antonio C. Araújo Jefferson F. D. F.

Publisher： MDPI

E-ISSN： 1424-8220|10|9|8119-8128

ISSN： 1424-8220

Source： Sensors, Vol.10, Iss.9, 2010-08, pp. : 8119-8128

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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.