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.
|Journal||Proceedings of SPIE - International Society for Optical Engineering|
|Publication status||Published - 28 Aug 2019|
|Event||Seventh European Workshop on Optical Fibre Sensors (EWOFS 2019) - Limassol, Cyprus|
Duration: 1 Oct 2019 → 4 Oct 2019
Bibliographical noteCopyright 2019 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Funding: People Programme (Marie Curie Actions) of the
European Union's Seventh Framework Programme FP7/2007-2013/ under REA grant agreement No. 608382, Marie Curie Intra European Fellowships included in the 7th Framework Program of the European
Union (projects PIEF-GA-2013-628604 and PIEF-GA-2011-302919), Horizon 2020 programme of European Union (Marie Skłodowska-Curie Actions - Individual Fellowships) under REA
grant agreement No. 844618 (project POSPORI).