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Proceedings Paper

Humidity sensor based on a long-period fiber grating coated with a SiO2-nanosphere film
Author(s): D. Viegas; J. Goicoechea; J. M. Corres; J. L. Santos; L. A. Ferreira; F. M. Araújo; I. R. Matias
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Paper 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.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70044O (16 May 2008); doi: 10.1117/12.786059
Show Author Affiliations
D. Viegas, Univ. do Porto (Portugal)
INESC Porto (Portugal)
J. Goicoechea, Univ. Pública de Navarra (Spain)
J. M. Corres, Univ. Pública de Navarra (Spain)
J. L. Santos, Univ. do Porto (Portugal)
INESC Porto (Portugal)
L. A. Ferreira, INESC Porto (Portugal)
F. M. Araújo, INESC Porto (Portugal)
I. R. Matias, Univ. Pública de Navarra (Spain)

Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors

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