Now showing items 42-61 of 72

    • Micro-drilled optical fiber for enhanced laser strain sensors 

      Pérez Herrera, Rosa Ana Upna Orcid; Bravo Acha, Mikel Upna Orcid; Roldán Varona, Pablo; Leandro González, Daniel Upna Orcid; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna Orcid (SPIE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, we present an experimental measurement of temperature and strain sensitivities of a micro-drilled optical fiber (MDOF). The MDOF consisted of a quasi-randomly distributed reflector along a single mode fiber ...
    • Microstructured optical fiber sensor for soil moisture measurements 

      López Aldaba, Aitor Upna; López Torres, Diego Upna Orcid; Campo-Bescós, Miguel Upna Orcid; López Rodríguez, José Javier Upna Orcid; Yerro Lizarazu, David; Elosúa Aguado, César Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna Orcid (Optical Society of America, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A discrete sensor based on a Sn0₂-FP (Fabry-Pérot) cavity is presented and characterized in real soil conditions. Results are compared, for the first time to our knowledge, with a commercial capacitive sensor and gravimetric ...
    • MIMO based decoupling strategy for grid connected power converters controlled in the synchronous reference frame 

      Samanes Pascual, Javier Upna Orcid; Gubía Villabona, Eugenio Upna Orcid; López Taberna, Jesús (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Power converters are frequently connected to the grid through a LCL filter, controlling its power transfer through a current control loop in the synchronous reference frame. In this reference frame, cross coupling terms ...
    • Modulated fiber ring laser and its application in high-sensitivity temperature sensors 

      Pérez Herrera, Rosa Ana Upna Orcid; Tainta Ausejo, Santiago Upna Orcid; Erro Betrán, María José Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (SPIE, 2016)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This work presents an experimental demonstration of a scheme based on an internally modulated fiber ring laser for high-sensitivity temperature sensing. The attained temperature resolution has been as low as ± 2pm even ...
    • 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 ...
    • Multiplexing optical fiber Fabry-Perot interferometers based on air-microcavities 

      Pérez Herrera, Rosa Ana Upna Orcid; Novais, Susana; Bravo Acha, Mikel Upna Orcid; Leandro González, Daniel Upna Orcid; Silva, Susana; Frazão, Orlando; López-Amo Sáinz, Manuel Upna Orcid (SPIE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work we demonstrate the multiplexing capability of new optical fiber Fabry-Perot interferometers based on airmicrocavities using a commercial FBG interrogator. Three optimized air-microcavity interferometer sensors ...
    • Multisampled-capacitor-voltage active damping for parallel interleaved grid connected voltage source converters with LCL filter 

      Samanes Pascual, Javier Upna Orcid; Gubía Villabona, Eugenio Upna Orcid (IEEE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Parallel interleaved converters for high power renewable energy systems present stability issues at the LCL resonance frequency. A multisampled measurement and filtering strategy is proposed to stabilize the system based ...
    • New hexagonal CORPS-BFN for multibeam antenna applications 

      Biurrun Quel, Carlos Upna Orcid; Montesano, Antonio; Ederra Urzainqui, Íñigo Upna Orcid; Iriarte Galarregui, Juan Carlos Upna Orcid; Río Bocio, Carlos del Upna Orcid (IEEE, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This work presents a new topology of a Coherently Radiating Periodic Structure - Beam Forming Network (CORPS-BFN) and its application for multibeam systems. A unit cell, consisting of a transition from a coaxial input to ...
    • On the influence of admissible orders in IVOVO 

      Uriz Martín, Mikel Xabier Upna; Paternain Dallo, Daniel Upna Orcid; Bustince Sola, Humberto Upna Orcid; Galar Idoate, Mikel Upna Orcid (Springer, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      It is known that when dealing with interval-valued data, there exist problems associated with the non-existence of a total order. In this work we investigate a reformulation of an interval-valued decomposition strategy for ...
    • On the influence of interval normalization in IVOVO fuzzy multi-class classifier 

      Uriz Martín, Mikel Xabier Upna; Paternain Dallo, Daniel Upna Orcid; Bustince Sola, Humberto Upna Orcid; Galar Idoate, Mikel Upna Orcid (Springer, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      IVOVO stands for Inverval-Valued One-Vs-One and is the combination of IVTURS fuzzy classifier and the One-Vs-One strategy. This method is designed to improve the performance of IVTURS in multi-class problems, by dividing ...
    • On the limits of the capacitor-voltage active damping for grid-connected power converters with LCL filter 

      Samanes Pascual, Javier Upna Orcid; Gubía Villabona, Eugenio Upna Orcid (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Active damping strategies are widely extended to avoid stability issues at the LCL filter resonant poles in grid-connected voltage source converters. The capacitor voltage derivative active damping effectively damps the ...
    • On the on-site measurement of the degradation rate of crystalline silicon PV modules at plant level 

      Pascual Miqueleiz, Julio María Upna Orcid; Berrueta Irigoyen, Alberto Upna Orcid; Marcos Álvarez, Javier Upna Orcid; García Solano, Miguel Upna Orcid; Marroyo Palomo, Luis Upna Orcid (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper proposes a method for measuring the degradation rate of crystalline silicon PV modules at plant level in two different ways as a form of verification. As actual levels of degradation rate have been observed to ...
    • On the requirements of the power converter for second-life lithium-ion batteries 

      Berrueta Irigoyen, Alberto Upna Orcid; San Martín Biurrun, Idoia Upna Orcid; Pascual Miqueleiz, Julio María Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The use of lithium-ion batteries is increasing year after year, especially in the automotive sector. Given the high requirements of electric vehicles, their energy storage systems are discarded when they still have around ...
    • Optical fiber immunosensors optimized with cladding etching and ITO nanodeposition 

      Cardona-Maya, Yamile; Del Villar, Ignacio Upna Orcid; Socorro Leránoz, Abián Bentor Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Botero-Cadavid, Juan F. (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Etched optical fiber immunosensors, with and without ITO nanodeposition, have been developed. The performance of these immunosensors has been assessed implementing an immunoassay. The sensitivity of the mmnunosensor increased ...
    • Optical fiber vacuum sensor based on modal interferometer and PDMS coating 

      Ascorbe Muruzabal, Joaquín Upna Orcid; Fuentes Lorenzo, Omar Upna; Corres Sanz, Jesús María Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This work studies the behavior of polydimethylsiloxane (PDMS) as a transducer for optical vacuum pressure measurements. The optical structure chosen for this device is a modal interferometer achieved by splicing a coreless ...
    • Optimal strain gauge configurations for the estimation of mechanical loads in the main shaft of HAWT 

      Iriarte Goñi, Xabier; Aginaga García, Jokin; Lerga Valencia, Francisco Javier; Gainza González, Gorka; Ros Ganuza, Javier; Bacaicoa Díaz, Julen (IOP Publishing, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In Structural Health Monitoring of wind turbines, measuring the mechanical loads is a key issue. The customary techniques for this task use a full-bridge strain gauge configuration to measure each of the six load components ...
    • 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 ...
    • Ransomware encrypted your files but you restored them from network traffic 

      Berrueta Irigoyen, Eduardo Upna Orcid; Morató Osés, Daniel Upna Orcid; Magaña Lizarrondo, Eduardo Upna Orcid; Izal Azcárate, Mikel Upna Orcid (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
      In a scenario where user files are stored in a network shared volume, a single computer infected by ransomware could encrypt the whole set of shared files, with a large impact on user productivity. On the other hand, medium ...
    • Relative humidity multi-point optical sensors system based on Fast Fourier multiplexing technique 

      López Aldaba, Aitor Upna; López Torres, Diego Upna Orcid; Elosúa Aguado, César Upna Orcid; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; Arregui San Martín, Francisco Javier Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a new multipoint optical fiber system for relative humidity measurements based on Sn02-FP (Fabry-Pérot) sensing heads and an optical interrogator as single active device is presented and characterized. The ...
    • Sensorless active damping strategy for parallel interleaved voltage source power converters with LCL filter 

      Samanes Pascual, Javier Upna Orcid; Gubía Villabona, Eugenio Upna Orcid (IEEE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Grid-connected pulse-width modulation converters with LCL filters are widely extended as an interface for renewable energy generating systems. Those filters arise stability issues due to the filter resonance, which, must ...