Cardona-Maya, YamileDel Villar, IgnacioSocorro Leránoz, Abián BentorCorres Sanz, Jesús MaríaArregui San Martín, Francisco JavierBotero-Cadavid, Juan F.2017-11-152017-11-1520172504-390010.3390/proceedings1040333https://academica-e.unavarra.es/handle/2454/26133Trabajo presentado en la Eurosensors 2017 Conference. París, 3–6 de septiembre de 2017.An optical fibre refractometer has been developed by etching and deposition of a thin film of indium tin oxide (ITO) on a single-mode-multimode-single-mode (SMS) fibre structure. The interference between modes in this structure is sensitive to the refractive index changes of the surrounding medium, achieving sensitivities of up to 7000 nm/RIU in the 1.333–1.338 RIU range. A salinity sensor has been implemented as a practical application of this proposed structure. Fast Fourier transform (FFT) analysis and tracking of an interference dip were used to monitor the interference between modes obtaining sensitivities of 0.99 nm/PSU and 0.025 rad/PSU, respectively.4 p.application/pdfeng© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.EtchingOptic fibre sensorRefractive indexSingle-mode–multimode–single-mode (SMS)Thin-filmsSalinityinfo:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/openAccess