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Highly Sensitive Refractive Index Sensor Based on Adiabatically Tapered Microfiber Long Period Gratings
Sensors 2013, 13(10), 14200-14213; doi:10.3390/s131014200

A Highly Sensitive Fiber Optic Sensor Based on Two-Core Fiber for Refractive Index Measurement

1 Fiber and Integrated Optics Laboratory, Electronics Engineering Department, UAM Reynosa-Rodhe, Universidad Autónoma de Tamaulipas, Carr. Reynosa-San Fernando S/N, Reynosa, Tamaulipas 88779, Mexico 2 NanoBioPhotonics Group, DICIS, University of Guanajuato, Salamanca, Guanajuato 368850, Mexico 3 Photonics and Optical Physics Laboratory, Optics Department, INAOE, Puebla, Puebla 72000, Mexico
* Author to whom correspondence should be addressed.
Received: 18 July 2013 / Revised: 12 September 2013 / Accepted: 13 September 2013 / Published: 22 October 2013
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A simple and compact fiber optic sensor based on a two-core fiber is demonstrated for high-performance measurements of refractive indices (RI) of liquids. In order to demonstrate the suitability of the proposed sensor to perform high-sensitivity sensing in a variety of applications, the sensor has been used to measure the RI of binary liquid mixtures. Such measurements can accurately determine the salinity of salt water solutions, and detect the water content of adulterated alcoholic beverages. The largest sensitivity of the RI sensor that has been experimentally demonstrated is 3,119 nm per Refractive Index Units (RIU) for the RI range from 1.3160 to 1.3943. On the other hand, our results suggest that the sensitivity can be enhanced up to 3485.67 nm/RIU approximately for the same RI range.
Keywords: fiber optic sensor; refractive index sensor; two-core fiber fiber optic sensor; refractive index sensor; two-core fiber
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Guzmán-Sepúlveda, J.R.; Guzmán-Cabrera, R.; Torres-Cisneros, M.; Sánchez-Mondragón, J.J.; May-Arrioja, D.A. A Highly Sensitive Fiber Optic Sensor Based on Two-Core Fiber for Refractive Index Measurement. Sensors 2013, 13, 14200-14213.

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