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Sensors 2013, 13(3), 3028-3038; doi:10.3390/s130303028

High Temperature Optical Fiber Sensor Based on Compact Fattened Long-Period Fiber Gratings

1
Espintrónica y Óptica Aplicada-CA, Departamento de Estudios Multidisciplinarios, DICIS, Universidad de Guanajuato, Av. Universidad s/n, Col. Yacatitas, Yuriria, Gto, 38940, Mexico
2
Centro de Investigaciones en Óptica, Loma del Bosque 115, Col. Lomas del Campestre, León, Guanajuato, 37150, Mexico
3
Optoelectrónica-CA, Departamento de Electrónica, DICIS, Universidad de Guanajuato, Carr. Salamanca-Valle Km 3.5 + 1.8, Palo Blanco, Salamanca, Gto, 36855, Mexico
*
Author to whom correspondence should be addressed.
Received: 5 January 2013 / Revised: 15 February 2013 / Accepted: 22 February 2013 / Published: 4 March 2013
(This article belongs to the Special Issue Laser Sensing and Imaging)
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Abstract

A compact high temperature fiber sensor where the sensor head consists of a short fattened long period fiber grating (F-LPFG) of at least 2 mm in length and background loss of −5 dBm is reported. On purpose two different F-LPFGs were used to measure temperature variations, taking advantage of their broad spectrum and the slope characteristics of the erbium light source. This approach affected the spectrum gain as the linear band shifting took place. The measured sensitivity of the long period fiber gratings were about 72 pm/°C in a range from 25 to 500 °C. Here, the temperature rate of the experiment was 0.17 °C/s and the temperature response time was within 3 s. Moreover, temperature changes were detected with an InGaAs photodetector, where a sensitivity of 0.05 mV/°C was achieved.
Keywords: long-period fiber grating; temperature sensor; electric arc; dispersion shifted fiber; fattening long-period fiber grating; temperature sensor; electric arc; dispersion shifted fiber; fattening
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Mata-Chávez, R.I.; Martínez-Rios, A.; Estudillo-Ayala, J.M.; Vargas-Rodríguez, E.; Rojas-Laguna, R.; Hernández-García, J.C.; Guzmán-Chávez, A.D.; Claudio-González, D.; Huerta-Mascotte, E. High Temperature Optical Fiber Sensor Based on Compact Fattened Long-Period Fiber Gratings. Sensors 2013, 13, 3028-3038.

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