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Open AccessArticle

Highly Sensitive Liquid Core Temperature Sensor Based on Multimode Interference Effects

1
Photonics and Optical Physics Laboratory, Optics Department, INAOE, Puebla, Puebla 72000, Mexico
2
Centro de Investigaciones en Optica, Unidad Aguascalientes, Prol. Constitución 607, Fracc. Reserva Loma Bonita, Aguascalientes, Ags. 20200, Mexico
3
CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL 32816, USA
4
NanoBioPhotonics Group, DICIS, University of Guanajuato, Salamanca, Guanajuato 368850, Mexico
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Sensors 2015, 15(10), 26929-26939; https://doi.org/10.3390/s151026929
Received: 22 August 2015 / Revised: 13 October 2015 / Accepted: 16 October 2015 / Published: 23 October 2015
(This article belongs to the Section Physical Sensors)
A novel fiber optic temperature sensor based on a liquid-core multimode interference device is demonstrated. The advantage of such structure is that the thermo-optic coefficient (TOC) of the liquid is at least one order of magnitude larger than that of silica and this, combined with the fact that the TOC of silica and the liquid have opposite signs, provides a liquid-core multimode fiber (MMF) highly sensitive to temperature. Since the refractive index of the liquid can be easily modified, this allows us to control the modal properties of the liquid-core MMF at will and the sensor sensitivity can be easily tuned by selecting the refractive index of the liquid in the core of the device. The maximum sensitivity measured in our experiments is 20 nm/°C in the low-temperature regime up to 60 °C. To the best of our knowledge, to date, this is the largest sensitivity reported for fiber-based MMI temperature sensors. View Full-Text
Keywords: fiber optic sensor; temperature sensor; multimode interference fiber optic sensor; temperature sensor; multimode interference
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Fuentes-Fuentes, M.A.; May-Arrioja, D.A.; Guzman-Sepulveda, J.R.; Torres-Cisneros, M.; Sánchez-Mondragón, J.J. Highly Sensitive Liquid Core Temperature Sensor Based on Multimode Interference Effects. Sensors 2015, 15, 26929-26939.

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