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Journal of Sensors
Volume 2018 (2018), Article ID 7595106, 6 pages
https://doi.org/10.1155/2018/7595106
Research Article

Temperature Sensor Based on an Asymmetric Two-Hole Fiber Using a Sagnac Interferometer

1Universidad Autónoma de Tamaulipas, Carretera a San Fernando Cruce con Canal Rodhe, S/N, Col Arcoiris, 88779 Reynosa, TAMPS, Mexico
2Centro de Investigaciones en Óptica, Unidad Aguascalientes, Prol. Constitución 607, Fracc. Reserva Loma Bonita, 20200 Aguascalientes, AGS, Mexico

Correspondence should be addressed to Daniel A. May-Arrioja; xm.oic@ajoirrad

Received 19 October 2017; Accepted 19 December 2017; Published 15 February 2018

Academic Editor: Stefania Campopiano

Copyright © 2018 René Domínguez-Cruz et al. 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.

Abstract

We report in this paper a temperature sensor based on an asymmetric two-hole fiber (ATHF) using a Sagnac interferometer (SI) configuration. The operation principle is based on the birefringence change induced by the temperature difference between the air holes and the silica fiber. As a result, the transmitted spectrum of the SI exhibits a sinusoidal profile which is shifted when the temperature is increased. A linear wavelength shift as a function of temperature is observed, and a sensitivity of 2.22 nm/°C was achieved using a 2 m long asymmetric THF, which is in the same order as those previously reported using similar microstructured fibers. The advantage of this system is a linear response, the use of a microstructured fiber with a simpler transverse geometry, and the use of bigger holes which can facilitate the insertion of several materials and improve the sensitivity of the sensor for different applications.