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Sensors 2017, 17(10), 2393; https://doi.org/10.3390/s17102393

Magnetic Field Sensing Based on Bi-Tapered Optical Fibers Using Spectral Phase Analysis

1
Departamento de Ingeniería Electrónica, División de Ingenierías, Universidad de Guanajuato, Carretera, Salamanca-Valle de Santiago km 3.5 + 1.8, Comunidad de Palo Blanco, Salamanca Gto. C.P. 36885, Mexico
2
Department of Electro-Optics and Photonics, University of Dayton, Dayton, OH 45469, USA
*
Author to whom correspondence should be addressed.
Received: 4 September 2017 / Revised: 28 September 2017 / Accepted: 12 October 2017 / Published: 20 October 2017
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Abstract

A compact, magnetic field sensor system based on a short, bi-tapered optical fiber (BTOF) span lying on a magnetic tape was designed, fabricated, and characterized. We monitored the transmission spectrum from a broadband light source, which displayed a strong interference signal. After data collection, we applied a phase analysis of the interference optical spectrum. We here report the results on two fabricated, BTOFs with different interference spectrum characteristics; we analyzed the signal based on the interference between a high-order modal component and the core fiber mode. The sensor exhibited a linear response for magnetic field increments, and we achieved a phase sensitivity of around 0.28 rad/mT. The sensing setup presented remote sensing operation and low-cost transducer magnetic material. View Full-Text
Keywords: tapered optical fibers; magnetic fiber optic sensor; optical signal processing tapered optical fibers; magnetic fiber optic sensor; optical signal processing
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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 (CC BY 4.0).
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Herrera-Piad, L.A.; Haus, J.W.; Jauregui-Vazquez, D.; Sierra-Hernandez, J.M.; Estudillo-Ayala, J.M.; Lopez-Dieguez, Y.; Rojas-Laguna, R. Magnetic Field Sensing Based on Bi-Tapered Optical Fibers Using Spectral Phase Analysis. Sensors 2017, 17, 2393.

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