Utilising thermal annealing for multiplexing and sensitivity enhancement of polymer optical fibre sensors

A. Pospori*, C. A.F. Marques, G. Sagias, H. Lamela-Rivera, D. Sáez-Rodríguezd, K. Nielsen, O. Bang, D. J. Webb

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

Thermal annealing was initially introduced for multiplexing purposes, since it can induce a permanent negative Bragg wavelength shift for polymer fibre grating sensors. At a later stage, it is shown that annealing can also provide additional benefits, such as strain and humidity sensitivity enhancement and augmented temperature operational range. In this paper, we report additional usage of thermal annealing on PMMA fibre Bragg grating sensors. We show the possibility to tune Bragg wavelengths to longer wavelengths permanently by stretching the polymer optical fibre during the thermal annealing process. An array of sensors fabricated with only one phase-mask, demonstrates the concept by having Bragg wavelengths below and above the original inscribed spectral position. In addition, we report that thermal annealing can be also used to enhance the performance of sensors when used for stress and force monitoring.

Original languageEnglish
Title of host publicationProceedings of SPIE
EditorsKyriacos Kalli, Gilberto Brambilla, Sinead O'Keeffe
Number of pages5
Volume11199
PublisherSPIE - International Society for Optical Engineering
Publication date1 Jan 2019
Article number111993E
ISBN (Electronic)9781510631236
DOIs
Publication statusPublished - 1 Jan 2019
Event7th European Workshop on Optical Fibre Sensors, EWOFS 2019 - Limassol, Cyprus
Duration: 1 Oct 20194 Oct 2019

Conference

Conference7th European Workshop on Optical Fibre Sensors, EWOFS 2019
Country/TerritoryCyprus
CityLimassol
Period01/10/201904/10/2019
SponsorOZ Optics Ltd.
SeriesProceedings of SPIE - The International Society for Optical Engineering
Volume11199
ISSN0277-786X

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