Humidity sensor based on a long-period fiber grating coated with a SiO2-nanosphere film

D. Viegas; J. Goicoechea; J. M. Corres; J. L. Santos; L. A. Ferreira; F. M. Araújo; I. R. Matias

doi:10.1117/12.786059

16 May 2008 Humidity sensor based on a long-period fiber grating coated with a SiO₂-nanosphere film

D. Viegas, J. Goicoechea, J. M. Corres, J. L. Santos, L. A. Ferreira, F. M. Araújo, I. R. Matias

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70044O (2008) https://doi.org/10.1117/12.786059
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

This work addresses a humidity sensor using long-period fiber gratings (LPG) coated with silica nanospheres film. SiO₂-nanospheres coating is deposited onto the LPG using the electrostatic self-assembly technique (ESA). The polymeric overlay changes its optical properties when exposed to different humidity levels, resulting in a shift of the resonance wavelength of the LPG. The obtained results are accordant with the theoretical simulations. Wavelength shifts up to 12nm in a humidity range from 20% to 80% are reported, maintaining the same dependence at different temperatures.

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D. Viegas, J. Goicoechea, J. M. Corres, J. L. Santos, L. A. Ferreira, F. M. Araújo, and I. R. Matias "Humidity sensor based on a long-period fiber grating coated with a SiO₂-nanosphere film", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70044O (16 May 2008); https://doi.org/10.1117/12.786059

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