Nonlinear response in polymer optical fibre Bragg grating based sensors

W. Zhang; D. J. Webb; G.-D. Peng

doi:10.1117/12.974937

17 October 2012 Nonlinear response in polymer optical fibre Bragg grating based sensors

W. Zhang, D. J. Webb, G.-D. Peng

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84214N (2012) https://doi.org/10.1117/12.974937
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

PMMA based polymer optical fibre Bragg gratings have been used for humidity, temperature and concentration sensing. Due to the water affinity of PMMA, the characteristic wavelength of the grating is largely modulated by the water content in the fibre. The rate of water transportation between fibre and surrounding depends on the permeability coefficient for PMMA, which is a function of surrounding temperature and humidity. This leads to increased water content with increasing humidity and temperature. Consequently the wavelength of the grating shows a nonlinear change over varying humidity and temperature. This nonlinearity needs to be calibrated prior to sensor application.

Citation Download Citation

W. Zhang, D. J. Webb, and G.-D. Peng "Nonlinear response in polymer optical fibre Bragg grating based sensors", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84214N (17 October 2012); https://doi.org/10.1117/12.974937

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