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Sensors 2015, 15(10), 26128-26142; doi:10.3390/s151026128

Analytical Modelling of a Refractive Index Sensor Based on an Intrinsic Micro Fabry-Perot Interferometer

1
Departamento de Estudios Multidisciplinarios, División de Ingenierías, Universidad de Guanajuato, Av. Universidad s/n, Col. Yacatitas, Yuriria, Gto., C.P. 38940, Mexico
2
Departamento de Tecnologías de la Información y Comunicación, Universidad Tecnológica del Suroeste de Guanajuato, Carretera Valle-Huanímaro km. 1.2, Valle de Santiago, Gto., C.P. 38400, Mexico
3
Departamento de Mecatrónica, Universidad Tecnológica de Salamanca, Av. Universidad Tecnológica #200, Col. Ciudad Bajío, Salamanca, Gto., C.P. 36766, Mexico
4
Departamento de 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
*
Author to whom correspondence should be addressed.
Academic Editor: Gangbing Song
Received: 22 July 2015 / Revised: 23 September 2015 / Accepted: 9 October 2015 / Published: 15 October 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3702 KB, uploaded 15 October 2015]   |  

Abstract

In this work a refractive index sensor based on a combination of the non-dispersive sensing (NDS) and the Tunable Laser Spectroscopy (TLS) principles is presented. Here, in order to have one reference and one measurement channel a single-beam dual-path configuration is used for implementing the NDS principle. These channels are monitored with a couple of identical optical detectors which are correlated to calculate the overall sensor response, called here the depth of modulation. It is shown that this is useful to minimize drifting errors due to source power variations. Furthermore, a comprehensive analysis of a refractive index sensing setup, based on an intrinsic micro Fabry-Perot Interferometer (FPI) is described. Here, the changes over the FPI pattern as the exit refractive index is varied are analytically modelled by using the characteristic matrix method. Additionally, our simulated results are supported by experimental measurements which are also provided. Finally it is shown that by using this principle a simple refractive index sensor with a resolution in the order of 2.15 × 10−4 RIU can be implemented by using a couple of standard and low cost photodetectors. View Full-Text
Keywords: Fabry-Perot interferometer; fiber optics sensors; interferometry; non dispersive sensing; tunable laser spectroscopy Fabry-Perot interferometer; fiber optics sensors; interferometry; non dispersive sensing; tunable laser spectroscopy
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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MDPI and ACS Style

Vargas-Rodriguez, E.; Guzman-Chavez, A.D.; Cano-Contreras, M.; Gallegos-Arellano, E.; Jauregui-Vazquez, D.; Hernández-García, J.C.; Estudillo-Ayala, J.M.; Rojas-Laguna, R. Analytical Modelling of a Refractive Index Sensor Based on an Intrinsic Micro Fabry-Perot Interferometer. Sensors 2015, 15, 26128-26142.

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