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Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain

Polymer optical fibre Bragg grating (POFBG) sensors are of high interest due to their enhanced fracture toughness, flexibility in bending, and sensitivity in stress and pressure monitoring applications compared to silica-based sensors. The POFBG sensors can also detect humidity due to the hydrophili...

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Autores principales: Pospori, Andreas, Ioannou, Andreas, Kalli, Kyriacos
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9572418/
https://www.ncbi.nlm.nih.gov/pubmed/36236332
http://dx.doi.org/10.3390/s22197233
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author Pospori, Andreas
Ioannou, Andreas
Kalli, Kyriacos
author_facet Pospori, Andreas
Ioannou, Andreas
Kalli, Kyriacos
author_sort Pospori, Andreas
collection PubMed
description Polymer optical fibre Bragg grating (POFBG) sensors are of high interest due to their enhanced fracture toughness, flexibility in bending, and sensitivity in stress and pressure monitoring applications compared to silica-based sensors. The POFBG sensors can also detect humidity due to the hydrophilic nature of some polymers. However, multi-parameter sensing can cause cross-sensitivity issues in certain applications if the temperature and humidity measurements are not adequately compensated. In this work, we demonstrate the possibility of selectively tuning sensors’ temperature and humidity sensitivities to the desired level by applying a certain amount of fibre pre-strain. The temperature sensitivity of POFBG sensors fabricated in perfluoropolymers (CYTOP) can be selectively tuned from positive to negative values, having the option for insensitivity in specific temperature ranges depending on the amount of the applied pre-strain. The humidity sensitivity of sensors can also be changed from positive values to insensitivity. The importance of thermal annealing treatment of POFBG sensors for improved repeatability in temperature measurements is also reported. An array of 4 multiplexed POFBGs was fabricated, and each sensor was pre-strained accordingly to demonstrate the possibility of having targeted temperature and humidity sensitivities along the same fibre.
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spelling pubmed-95724182022-10-17 Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain Pospori, Andreas Ioannou, Andreas Kalli, Kyriacos Sensors (Basel) Article Polymer optical fibre Bragg grating (POFBG) sensors are of high interest due to their enhanced fracture toughness, flexibility in bending, and sensitivity in stress and pressure monitoring applications compared to silica-based sensors. The POFBG sensors can also detect humidity due to the hydrophilic nature of some polymers. However, multi-parameter sensing can cause cross-sensitivity issues in certain applications if the temperature and humidity measurements are not adequately compensated. In this work, we demonstrate the possibility of selectively tuning sensors’ temperature and humidity sensitivities to the desired level by applying a certain amount of fibre pre-strain. The temperature sensitivity of POFBG sensors fabricated in perfluoropolymers (CYTOP) can be selectively tuned from positive to negative values, having the option for insensitivity in specific temperature ranges depending on the amount of the applied pre-strain. The humidity sensitivity of sensors can also be changed from positive values to insensitivity. The importance of thermal annealing treatment of POFBG sensors for improved repeatability in temperature measurements is also reported. An array of 4 multiplexed POFBGs was fabricated, and each sensor was pre-strained accordingly to demonstrate the possibility of having targeted temperature and humidity sensitivities along the same fibre. MDPI 2022-09-23 /pmc/articles/PMC9572418/ /pubmed/36236332 http://dx.doi.org/10.3390/s22197233 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Pospori, Andreas
Ioannou, Andreas
Kalli, Kyriacos
Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain
title Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain
title_full Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain
title_fullStr Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain
title_full_unstemmed Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain
title_short Temperature and Humidity Sensitivity of Polymer Optical Fibre Sensors Tuned by Pre-Strain
title_sort temperature and humidity sensitivity of polymer optical fibre sensors tuned by pre-strain
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9572418/
https://www.ncbi.nlm.nih.gov/pubmed/36236332
http://dx.doi.org/10.3390/s22197233
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