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Magnetic Field Sensing Based on Bi-Tapered Optical Fibers Using Spectral Phase Analysis
Luis A. Herrera-Piad 1 , Joseph W. Haus 2 , Daniel Jauregui-Vazquez 1 , Juan M. Sierra-Hernandez, 1 Julian M. Estudillo-Ayala 1 , Yanelis Lopez-Dieguez, 1 Roberto Rojas-Laguna 1
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;(L.A.H.-P.);(J.M.S.-H.);(J.M.E.-A.);(Y.L.-D.);(R.R.-L.)
2  Department of Electro-Optics and Photonics, University of Dayton, Dayton, OH 45469, USA

Published: 20 October 2017 by MDPI in Sensors
MDPI, Volume 17; 10.3390/s17102393
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.
Keywords: Optical signal processing, Tapered Optical Fibers, Magnetic Fiber Optic Sensor
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