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Proceedings Paper

Strongly coupled multi-core fiber-based interferometer for high temperature sensing
Author(s): Josu Amorebieta; Gaizka Durana; Angel Ortega-Gomez; Rubén Fernández; Javier Velasco; Idurre Sáez de Ocáriz; Joseba Zubia; Enrique Antonio-Lopez; Axel Schülzgen; Rodrigo Amezcua-Correa; Joel Villatoro
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Paper Abstract

The design and performance evaluation of an innovative, small size, compactly packaged high temperature interferometric optical sensor for harsh environments is reported. The sensor was built with a short segment of strongly coupled multi-core optical fiber (MCF) spliced to a typical single mode fiber (SMF). Matlab MathWorks and PhotonDesign simulation programs were used to design the sensor to monitor the widest temperature range possible with a commercial sensor interrogator. The SMF-MCF structure was protected by two temperature-resistant tubes: an inner ceramic tube with an internal hole that matched the MCF diameter in order keep it tightly in axial direction to avoid the effects of bending and/or vibrations that could be misinterpreted as temperature measurements, and an outer metallic tube to provide protection against impacts. The calibration of our packaged MCF sensor was carried out in a high temperature furnace at the facilities of the Aeronautical Technologies Center (CTA) and a calibrated standard K-type thermocouple was used as a reference. The calibration was performed repeatedly in the range from 200 to 950 °C and the gathered spectra were processed entirely by a custom program made in Matlab MathWorks. Our sensor responded lineally in the tested range with an average temperature sensitivity of 29.1 pm/°C and showed high robustness against vibrations. Results indicate that our MCF sensor is as accurate as the K-type thermocouple with the advantage of its appropriate passiveness for harsh environmental industrial applications.

Paper Details

Date Published: 15 April 2019
PDF: 8 pages
Proc. SPIE 11029, Micro-structured and Specialty Optical Fibres VI, 110290R (15 April 2019); doi: 10.1117/12.2520711
Show Author Affiliations
Josu Amorebieta, Univ. del País Vasco (Spain)
Gaizka Durana, Univ. del País Vasco (Spain)
Angel Ortega-Gomez, Univ. del País Vasco (Spain)
Rubén Fernández, Univ. del País Vasco (Spain)
Javier Velasco, Aeronautical Technologies Ctr. (Spain)
Idurre Sáez de Ocáriz, Aeronautical Technologies Ctr. (Spain)
Joseba Zubia, Univ. del País Vasco (Spain)
Enrique Antonio-Lopez, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Axel Schülzgen, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Rodrigo Amezcua-Correa, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Joel Villatoro, Univ. del País Vasco (Spain)
IKERBASQUE - Basque Foundation for Science (Spain)

Published in SPIE Proceedings Vol. 11029:
Micro-structured and Specialty Optical Fibres VI
Kyriacos Kalli; Alexis Mendez; Pavel Peterka, Editor(s)

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