Del Villar, IgnacioGoñi Carnicero, JaimeVicente Gómara, AdriánArregui San Martín, Francisco JavierMatías Maestro, Ignacio2020-03-202020-05-102019I. Del Villar, J. Goñi, A. Vicente, F. J. Arregui and I. R. Matias, 'Etched and Nanocoated Single-Mode Multimode Single-Mode (SMS) Fibers for Detection of Wind Turbine Gearbox Oil Degradation,' in Journal of Lightwave Technology, vol. 37, no. 18, pp. 4665-4673, 15 Sept.15, 2019. doi: 10.1109/JLT.2019.29159660733-872410.1109/JLT.2019.2915966https://academica-e.unavarra.es/handle/2454/36538The application of an etching process in a single-mode multimode single-mode (SMS) fiber allows monitoring the change of refractive index of wind turbine gearbox oil due to temperature and degradation with a limitation at short temperatures, where the transmission and attenuation bands in the optical spectrum fade. The application of a black tin oxide nanocoating solves this issue and allows tuning the refractive index region where the sensitivity is maximum. The SMS was designed for operating at short wavelengths, where the setup is less expensive. The experimental results were contrasted with a theoretical analysis developed with FIMMWAVE, which allowed understanding better the phenomena involved in the experiments.9 p.application/pdfeng© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other work.Optical fiber sensorsSingle-mode multimode single-mode (SMS)Low cutoff single-mode fiberThin filmsWind turbine prognosisinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess