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Annealing effects on strain and stress sensitivity of polymer optical fibre based sensors

Pospori, A. ; Marques, C. ; Zubel, M. ; Saez-Rodriguez, D. ; Nielsen, K. ; Bang, O. ; Webb, D. J.

Annealing effects on strain and stress sensitivity of polymer optical fibre based sensors, Proc SPIE Photonics Europe, Brussels, Belgium, Vol. Proc. SPIE 9886, Micro-Structured and Specialty Optical Fibres IV, pp. 98860V - 98860V-7, April, 2016.

Digital Object Identifier: 10.1117/12.2227473

Abstract
The annealing effects on strain and stress sensitivity of polymer optical fibre Bragg grating sensors after their photoinscription
are investigated. PMMA optical fibre based Bragg grating sensors are first photo-inscribed and then they
were placed into hot water for annealing. Strain, stress and force sensitivity measurements are taken before and after
annealing. Parameters such as annealing time and annealing temperature are investigated. The change of the fibre
diameter due to water absorption and the annealing process is also considered. The results show that annealing the
polymer optical fibre tends to increase the strain, stress and force sensitivity of the photo-inscribed sensor.