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Sensitivity enhancement using annealed polymer optical-fibre-based sensors for pressure sensing applications
Author(s): A. Pospori; C. A. F. Marques; D. Sáez-Rodríguez; K. Nielsen; O. Bang; D. J. Webb
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Paper Abstract

Thermal annealing can be used to induce a permanent negative Bragg wavelength shift for polymer fibre grating sensors and it was originally used for multiplexing purposes. Recently, researchers showed that annealing can also provide additional benefits, such as strain and humidity sensitivity enhancement and augmented temperature operational range. The annealing process can change both the optical and mechanical properties of the fibre. In this paper, the annealing effects on the stress and force sensitivities of PMMA fibre Bragg grating sensors are investigated. The incentive for that investigation was an unexpected behaviour observed in an array of sensors which were used for liquid level monitoring. One sensor exhibited much lower pressure sensitivity and that was the only one that was not annealed. To further investigate the phenomenon, additional sensors were photo-inscribed and characterised with regard their stress and force sensitivities. Then, the fibres were annealed by placing them in hot water, controlling with that way the humidity factor. After annealing, stress and force sensitivities were measured again. The results show that the annealing can improve the stress and force sensitivity of the devices. This can provide better performing sensors for use in stress, force and pressure sensing applications.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160E (30 May 2016); doi: 10.1117/12.2236877
Show Author Affiliations
A. Pospori, Aston Univ. (United Kingdom)
C. A. F. Marques, Aston Univ. (United Kingdom)
D. Sáez-Rodríguez, Aston Univ. (United Kingdom)
K. Nielsen, DTU Fotonik (Denmark)
O. Bang, DTU Fotonik (Denmark)
D. J. Webb, Aston Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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