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High Temperature Optical Fiber Sensor Based on Compact Fattened Long-Period Fiber Gratings
Ruth I. Mata-Chávez 1 , Alejandro Martínez-Rios, 2 Julián Moisés Estudillo-Ayala 3 , Everardo Vargas-Rodríguez, 1 Roberto Rojas-Laguna 3 , Juan C. Hernández-García 3 , Ana D. Guzmán-Chávez 1 , David Claudio-González 1 , Eduardo Huerta-Mascotte 1
1  Espintrónica y Óptica Aplicada-CA, Departamento de Estudios Multidisciplinarios, DICIS, Universidad de Guanajuato, Av. Universidad s/n, Col. Yacatitas, Yuriria, Gto, 38940, Mexico; s:(E.V.-R.);(A.D.G.-C.);(D.C.-G.);(E.H.-M.)
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; s:(J.M.E.-A.);(R.R.-L.);(J.C.H.-G.)

Published: 04 March 2013 by MDPI in Sensors
MDPI, Volume 13; 10.3390/s130303028
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: dispersion shifted fiber, electric arc, fattening, long-period fiber grating, temperature sensor, 42.81.-i
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