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Open AccessArticle

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.
Sensors 2017, 17(10), 2393; https://doi.org/10.3390/s17102393
Received: 4 September 2017 / Revised: 28 September 2017 / Accepted: 12 October 2017 / Published: 20 October 2017
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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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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