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Sensors 2011, 11(12), 11103-11111; doi:10.3390/s111211103
Article

Magnetic Field Measurements Based on Terfenol Coated Photonic Crystal Fibers

1,* , 2
,
1
,
1
 and
1
1 Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, Rio de Janeiro, RJ 22453-900, Brazil 2 Department of Electronics, Federal University of Technology-Parana, Av Monteiro Lobato, s/n–km 04-Ponta Grossa, PR 84016-210, Brazil
* Author to whom correspondence should be addressed.
Received: 25 October 2011 / Revised: 21 November 2011 / Accepted: 23 November 2011 / Published: 28 November 2011
(This article belongs to the Special Issue Optical Fiber Sensors)
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Abstract

A magnetic field sensor based on the integration of a high birefringence photonic crystal fiber and a composite material made of Terfenol particles and an epoxy resin is proposed. An in-fiber modal interferometer is assembled by evenly exciting both eigenemodes of the HiBi fiber. Changes in the cavity length as well as the effective refractive index are induced by exposing the sensor head to magnetic fields. The magnetic field sensor has a sensitivity of 0.006 (nm/mT) over a range from 0 to 300 mT with a resolution about ±1 mT. A fiber Bragg grating magnetic field sensor is also fabricated and employed to characterize the response of Terfenol composite to the magnetic field.
Keywords: photonic crystal fiber; high birefringence; magnetic field sensing; air-silica structured fiber; microstructured fiber photonic crystal fiber; high birefringence; magnetic field sensing; air-silica structured fiber; microstructured fiber
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.; Martelli, C.; Braga, A.M.B.; Valente, L.C.G.; Kato, C.C. Magnetic Field Measurements Based on Terfenol Coated Photonic Crystal Fibers. Sensors 2011, 11, 11103-11111.

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