Now showing items 1-20 of 179

    • Multichannel refractometer based on lossy mode resonances 

      Fuentes Lorenzo, Omar Upna; Corres Sanz, Jesús María Upna Orcid; Domínguez Rodríguez, Ismel Upna Orcid; Del Villar, Ignacio Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2022)   Artículo / Artikulua
      In this work a new multiparameter sensor platform based on lossy mode resonances is presented. The structure consists of a soda-lime optical slab waveguide butt-coupled to multimode optical fibers. A variable thickness ...
    • Intelligent SDN-based multi-protocol selector for IoT-enabled NMT networks 

      Al-Rahamneh, Anas; Astrain Escola, José Javier Upna Orcid; López Iturri, Peio Upna Orcid; Picallo Guembe, Imanol Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid (IEEE, 2021)   Contribución a congreso / Biltzarrerako ekarpena
      The popularity of the Internet of Things is increasing and it is being used in many commercial sectors, using customized technologies for specific environments. Applications and protocols, and the unique requirements of ...
    • Flat lens antenna using gap waveguide technology at millimeter waves 

      Pérez, Dayan Upna Orcid; Bilitos, Christos; Ruiz-García, J.; González-Ovejero, D.; Beruete Díaz, Miguel Upna Orcid (IEEE, 2021)   Contribución a congreso / Biltzarrerako ekarpena
      In this paper, a flat lens antenna using Gap Waveguide (GW) technology working in the millimeter waves band was designed. The metamaterial lens is fed using a Groove Gap Waveguide (GGW) horn antenna in order to achieve a ...
    • Fiber-based label-free D-dimer detection for early diagnosis of venous thromboembolism 

      Zubiate Orzanco, Pablo Upna Orcid; Urrutia Azcona, Aitor Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Fernández Irigoyen, Joaquín Upna Orcid; Giannetti, Ambra; Baldini, Francesco; Díaz Lucas, Silvia Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Santamaría, Enrique; Del Villar, Ignacio Upna Orcid; Chiavaioli, Francesco (SPIE, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      D-dimer is a useful diagnostic biomarker for deep vein thrombosis or pulmonary embolism, collectively referred to as venous thromboembolism (VTE). The ability to detect in real-time the amount of D-dimer with a fast and ...
    • Effect of the inner current loop on the voltage regulation for three-phase photovoltaic inverters 

      Urtasun Erburu, Andoni Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Marroyo Palomo, Luis Upna Orcid (IEEE, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In three-phase grid-connected PV inverters, regulating the input voltage is a fundamental requirement. In order to reduce the influence of the PV non-linear behavior and ensure stability in the whole operating range, the ...
    • On the calculation of the STC power of PV generators by using typical monitoring system data 

      Muñoz Escribano, Mikel Upna; Parra Laita, Íñigo de la Upna Orcid; García Solano, Miguel Upna Orcid; Marcos Álvarez, Javier Upna Orcid; Marroyo Palomo, Luis Upna Orcid (2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The properly in-field characterization of the power at Standard Test Conditions, PSTC, of PV generators is becoming increasingly important in order to evaluate their performance and its evolution in time. Within the state ...
    • Characterization of near-ground radio propagation channel for wireless sensor network with application in smart agriculture 

      Klaina, Hicham Upna; Alejos, Ana; Aghzout, Otman; Falcone Lanas, Francisco Javier Upna Orcid (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this contribution, we present a narrowband radio channel model for a scenario wherein the radio link operates under near-ground conditions, occurring on a ZigBee wireless sensor networks applied to smart agriculture. ...
    • Title enhancement of the sensitivity of a volatile organic compounds MOF-sensor by means of its structure 

      López Torres, Diego Upna Orcid; López Aldaba, Aitor Upna; Elosúa Aguado, César Upna Orcid; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, we experimentally compare several core structures of Microstructured Optical Fibers (MOFs) for low-finesse Fabry-Pérot (FP) sensors. These sensors are designed for Volatile Organic Compounds (VOCs) measurements. ...
    • Monitoring the etching process in LPFGs towards development of highly sensitive sensors 

      Del Villar, Ignacio Upna Orcid; Cruz, José Luis; Socorro Leránoz, Abián Bentor Upna Orcid; Díaz Lucas, Silvia Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, the monitoring of the etching process up to a diameter of 30 µm of two LPFG structures has been compared, one of them had initially 125 µm, whereas the second one had 80 µm. By tracking the wavelength shift ...
    • Detection of ethanol in human breath using optical fiber long period grating coated with metal-organic frameworks 

      Acha Morrás, Nerea de Upna Orcid; Hromadka, Jiri; Tokay, Begum; Correia, Ricardo; Elosúa Aguado, César Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Morgan, Stephen P.; Korposh, Sergiy (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      An optical fiber sensor for ethanol detection in exhaled breath has been developed. It has been fabricated by functionalizing a Long Period Grating with a metal-organic framework, ZIF-8. The sensor’s response was tested ...
    • Etched and nanocoated SMS fiber sensor for detection of salinity concentration 

      Cardona-Maya, Yamile; Del Villar, Ignacio Upna Orcid; Socorro Leránoz, Abián Bentor Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Botero-Cadavid, Juan F. (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      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 ...
    • Compensation of forecast error in large PV plants with battery storage: associated strategies 

      Marcos Álvarez, Javier Upna Orcid; Parra Laita, Íñigo de la Upna Orcid; Muñoz Escribano, Mikel Upna; García Solano, Miguel Upna Orcid; Marroyo Palomo, Luis Upna Orcid (2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      As penetration rates of utility-scale photovoltaics (PV) increases, large PV plants will participate in the daily wholesale electricity market in the same way that wind farms. Then, PV plant owner can receive some kind of ...
    • Brillouin optical time-domain analyzer for extended sensing range using probe dithering and cyclic coding 

      Iribas Pardo, Haritz Upna Orcid; Loayssa Lara, Alayn Upna Orcid; Sauser, Florian; Llera, Miguel; Le Floch, Sébastien (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We present an enhanced performance Brillouin optical time-domain analysis sensor that uses dual probes waves with optical frequency modulation and cyclic coding. The frequency modulation serves to increase the probe power ...
    • Enhancement of signal-to-noise ratio in Brillouin optical time domain analyzers by dual-probe detection 

      Iribas Pardo, Haritz Upna Orcid; Loayssa Lara, Alayn Upna Orcid; Sauser, Florian; Llera, Miguel; Le Floch, Sébastien (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We demonstrate a simple technique to enhance the signal-to-noise ratio (SNR) in Brillouin optical time-domain analysis sensors by the addition of gain and loss processes. The technique is based on the shift of the pump ...
    • Detrimental effects in Brillouin distributed sensors caused by EDFA transient 

      Feng, Cheng; Iribas Pardo, Haritz Upna Orcid; Mariñelarena Ollacarizqueta, Jon Upna Orcid; Schneider, Thomas; Loayssa Lara, Alayn Upna Orcid (Optical Society of AmericaIEEE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We investigate the deleterious effect and the error in Brillouin optical time-domain analyzers induced by the combination of a low extinction ratio pulse generation with the transient behavior of erbium-doped fiber amplifiers.
    • Zuntz optikoan oinarritutako sentsoreen prestazioen muga-efektu berria, egituren egoera monitorizatzea helburu 

      Iribas Pardo, Haritz Upna Orcid; Mariñelarena Ollacarizqueta, Jon Upna Orcid; Loayssa Lara, Alayn Upna Orcid (Udako Euskal Unibertsitatea, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Brillouin denbora-eremu optikoaren analisian (BOTDA) oinarritutako sentsoreak estruktura handien (120 km luzerako estrukturak) deformazioa eta tenperatura neurtzeko gaitasuna dute, metro bateko bereizmen espazialarekin. ...
    • Second-order non-local effects mitigation in BOTDA sensors by tracking the BFS profile 

      Mompó Roselló, Juan José Upna; Iribas Pardo, Haritz Upna Orcid; Urricelqui Polvorinos, Javier Upna Orcid; Loayssa Lara, Alayn Upna Orcid (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We demonstrate a technique to mitigate the residual second-order non-local effects in Brillouin optical time-domain analysis (BOTDA) sensors in which the Brillouin frequency shift (BFS) profile is not uniform along the ...
    • Random fiber lasers: application to fiber optic sensors networks 

      López-Amo Sáinz, Manuel Upna Orcid; Leandro González, Daniel Upna Orcid; Miguel Soto, Verónica de Upna Orcid; Bravo Acha, Mikel Upna Orcid; Fernández Vallejo, Montserrat Upna; Pérez Herrera, Rosa Ana Upna Orcid (IEEE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Recently, random mirrors have been proposed as a method to create fiber laser cavities. This kind of cavity is based on cooperative Rayleigh scattering, which is generated along a fiber due to the material inhomogeneities ...
    • Influence of saturable absorbers on fiber ring laser sensors 

      Rodríguez Cobo, L.; Quintela, M. A.; Ruiz Lombera, Rubén; Pérez Herrera, Rosa Ana Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; López Higuera, José Miguel (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, a fiber ring laser sensor has been employed to analyze the influence of passive Er-doped fiber acting as saturable absorber. Lasing modes of fiber ring lasers can be reduced by properly locating a saturable ...
    • Interferometric vs wavelength selective optical fiber sensors for cryogenic temperature measurements 

      Miguel Soto, Verónica de Upna Orcid; Leandro González, Daniel Upna Orcid; López Aldaba, Aitor Upna; Beato López, Juan Jesús Upna Orcid; Pérez de Landazábal Berganzo, José Ignacio Upna Orcid; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna Orcid (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, a preliminary study of the behavior of two different interferometric fiber optic sensors and two different wavelength selective fiber optic sensors is performed. A photonic cristal fiber Fabry-Pérot interferometer, ...