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Proceedings Paper

Humidity sensor based on a long-period fiber grating coated with a hydrophobic thin film
Author(s): A. Urrutia; P. J. Rivero; J. Goicoechea; F. J. Arregui; I. R. Matías
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Paper Abstract

In this work it is proposed a novel fiber optic humidity sensor based on a functionally coated long-period fiber grating (LPG). The coating is composed of tetraorthosilicate matrix functionalized with perfluorooctyltriethoxysilane and its fabrication was performed by the sol-gel technique using a dip coating process using the LPG as substrate. This technique allows to fabricate sensitive films in a fast and simple way compared to other overlay fabrication techniques. The fabricated sensor was tested in a programmable temperature and climatic chamber. Relative humidity (RH) was varied in range from 20%RH to 80%RH at room temperature. The results showed a smooth exponential-like wavelength shift of the LPG attenuation band.

Paper Details

Date Published: 8 September 2010
PDF: 4 pages
Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 765320 (8 September 2010); doi: 10.1117/12.865753
Show Author Affiliations
A. Urrutia, Univ. Pública de Navarra (Spain)
P. J. Rivero, Univ. Pública de Navarra (Spain)
J. Goicoechea, Univ. Pública de Navarra (Spain)
F. J. Arregui, Univ. Pública de Navarra (Spain)
I. R. Matías, Univ. Pública de Navarra (Spain)

Published in SPIE Proceedings Vol. 7653:
Fourth European Workshop on Optical Fibre Sensors
José Luís Santos; Brian Culshaw; José Miguel López-Higuera; William N. MacPherson, Editor(s)

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