Ruiz ZamarreƱo, Carlos
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Ruiz ZamarreƱo
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Carlos
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IngenierĆa ElĆ©ctrica, ElectrĆ³nica y de ComunicaciĆ³n
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ISC. Institute of Smart Cities
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Publication Open Access Optical fiber thermo-refractometer(Optica, 2022) Imas GonzĆ”lez, JosĆ© Javier; Ruiz ZamarreƱo, Carlos; Del Villar, Ignacio; Cardozo da Silva, Jean Carlos; Oliveira, V.; MatĆas Maestro, Ignacio; IngenierĆa ElĆ©ctrica, ElectrĆ³nica y de ComunicaciĆ³n; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio IngeniaritzarenThis work presents the implementation of a thermo-refractometer, which integrates the measurement of both refractive index and temperature in a single optical fiber structure. To this purpose, a lossy mode resonance (LMR)-based refractometer is obtained by means of the deposition of a titanium dioxide (TiO2) thin film onto a side-polished (D-shaped) single mode fiber. Measurement and subsequent temperature compensation are achieved by means of a fiber Bragg grating (FBG) inscribed in the core of the D-shaped region. The LMR wavelength shift is monitored in transmission while the FBG (FBG peak at 1533 nm) displacement is observed in reflection. The LMR is sensitive to both the surrounding refractive index (SRI), with a sensitivity of 3725.2 nm/RIU in the 1.3324-1.3479 range, and the temperature (- 0.186 nm/Ā°C); while the FBG is only affected by the temperature (32.6 pm/Ā°C in the 25Ā°C - 45Ā°C range). With these values, it is possible to recover the SRI and temperature variations from the wavelength shifts of the LMR and the FBG, constituting a thermo-refractometer, where it is suppressed the effect of the temperature over the refractometer operation, which could cause errors in the fourth or even third decimal of the measured SRI value.Publication Open Access Low cutoff wavelength etched SMS structures towards verification of the quality of automotive antifreeze(IEEE, 2020) RodrĆguez RodrĆguez, Wenceslao Eduardo; RodrĆguez RodrĆguez, Adolfo JosuĆ©; Ruiz ZamarreƱo, Carlos; Del Villar, Ignacio; ZĆŗƱiga AlanĆs, Manuel; IngenierĆa ElĆ©ctrica, ElectrĆ³nica y de ComunicaciĆ³n; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Gobierno de Navarra / Nafarroako Gobernua, 2019 904 116; Universidad PĆŗblica de Navarra / Nafarroako Unibertsitate Publikoa, PJUPNA26Optical fiber single mode-multimode-single mode (SMS) structures can be used as wavelength detection-based sensors. In this work, we focus on the performance at short wavelengths, where optical sources and detectors are less expensive. Here, a self-image band with a high transmission power is monitored in this short-wavelength range. In addition, the diameter and the length of the SMS structure have been optimized in order to improve the sensitivity of the device. In this sense, a maximum refractive index sensitivity of 305 nm/RIU was achieved by an etched SMS with a diameter of 34Ī¼ m. Furthermore, the obtained devices were used for testing the quality of automotive coolant and antifreeze liquid.Publication Open Access Copper oxide coated D-shaped optical fibers for the development of LMR refractometers(IEEE, 2020) Ozcariz Celaya, Aritz; Vitoria Pascual, Ignacio; Arregui San MartĆn, Francisco Javier; Ruiz ZamarreƱo, Carlos; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; IngenierĆa ElĆ©ctrica, ElectrĆ³nica y de ComunicaciĆ³n; Universidad PĆŗblica de Navarra / Nafarroako Unibertsitate Publikoa, PJUPNA26Lossy mode resonance (LMR) based refractometers obtained by means of copper oxide thin-films fabricated onto side-polished (D-shaped) are presented in this work. The high refractive index of copper oxide combined with the propagation mode isolation capabilities of D-shaped fibers allows for the observation of narrow (30 nm) and high sensitive (10,336 nm per refractive index unit) LMRs, which could enable to improve the performance of LMR-based refractometers as well as provide an alternative label-free sensing platform for LMR-based sensors.Publication Open Access Alfalfa quality detection by means of VIS-NIR optical fiber reflection spectroscopy(IEEE, 2022) Ruiz ZamarreƱo, Carlos; Gracia MoisĆ©s, Ander; Vitoria Pascual, Ignacio; Imas GonzĆ”lez, JosĆ© Javier; CastaƱo de EgĆ¼Ć©s, Lorena Yveth; Avedillo de la Casa, Amaia; MatĆas Maestro, Ignacio; IngenierĆa ElĆ©ctrica, ElectrĆ³nica y de ComunicaciĆ³n; Institute of Smart Cities - ISC; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Universidad PĆŗblica de Navarra / Nafarroako Unibertsitate PublikoaA first approach study for the classification of alfalfa (medicago sativa) quality has been performed by means of VIS-NIR optical fiber reflection spectroscopy. Reflection spectral data has been obtained from alfalfa samples comprising six different qualities. Obtained data has been classified and organized to feed supervised self-learning algorithms. Neural networks have been used in order to differentiate the quality level of the samples. Obtained results permit to validate the proposed approach with 72% of the samples properly classified. In addition, proposed solution was implemented in a low cost automated detection prototype suitable to be used by non-qualified operators. Obtained equipment consist of a first step towards its utilization in quality monitoring and classification of many other products in the agri-food field.