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

Urrutia Azcona, AitorRivero Fuente, Pedro J.Goicoechea Fernández, JavierArregui San Martín, Francisco JavierMatías Maestro, Ignacio2022-05-092022-05-092010https://academica-e.unavarra.es/handle/2454/42871Póster presentado al 4th European Workshop on Optical Fibre Sensors. Oporto, 2010.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.application/pdfengOptical fibre sensorsHumiditySuperhidrophobicityHumidity sensor based on a long-period fiber grating coated with a hydrophobic thin filminfo:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/openAccess