Humidity sensor based on a long-period fiber grating coated with a hydrophobic thin film

A. Urrutia; P. J. Rivero; J. Goicoechea; F. J. Arregui; I. R. Matías

doi:10.1117/12.865753

8 September 2010 Humidity sensor based on a long-period fiber grating coated with a hydrophobic thin film

A. Urrutia, P. J. Rivero, J. Goicoechea, F. J. Arregui, I. R. Matías

Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 765320 (2010) https://doi.org/10.1117/12.865753
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal

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.

Citation Download Citation

A. Urrutia, P. J. Rivero, J. Goicoechea, F. J. Arregui, and I. R. Matías "Humidity sensor based on a long-period fiber grating coated with a hydrophobic thin film", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 765320 (8 September 2010); https://doi.org/10.1117/12.865753

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