Now showing items 466-485 of 572

    • Scanning electromyography 

      Navallas Irujo, Javier Upna; Rodríguez Falces, Javier Upna; Stålberg, Erik (InTechOpen, 2012)   Capítulo de libro / Liburuen kapitulua  OpenAccess
      The study of the anatomy and physiology of the motor unit has important implications in the diagnosis and follow-up of neuromuscular pathologies. Muscle action potentials allow the use of electrophysiological techniques ...
    • SCATTMAT: a mode matching and generalized scattering matrix code for personal computers in a windows environment 

      Liberal, Antonio; Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna (1997)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a computer aided design tool is presented to simulate symmetrical radially deformed circular waveguide microwave components. This tool works with the well-known “Mode Matching and Scattering Matrix” ...
    • SCATTMAT: herramienta C.A.D. para el análisis de componentes en guía de onda circular con variaciones simétricas del radio 

      Liberal, Antonio; Lahera, Miguel; Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna (1996)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a C.A.D. tool to simulate simmetrical radial deformation microwave devices, using the modal analysis and scattering matrix techniques is presented. The code has been developed in C++ language, working with ...
    • Sculpting metals for anomalous transmission phenomena, complex waves and negative refractive metamaterials: underlying physics and applications 

      Navarro Cía, Miguel Upna (2011)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this talk, the potential of controlling the electromagnetic propagation by periodically-textured surfaces is reviewed. It is shown that backward-wave- and slow-wave-propagation, superluminal, effective negative ...
    • Second-order non-local effects mitigation in BOTDA sensors by tracking the BFS profile 

      Mompó Roselló, Juan José Upna; Iribas Pardo, Haritz Upna; Urricelqui Polvorinos, Javier Upna; Loayssa Lara, Alayn Upna (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 ...
    • Second-order nonlocal effects mitigation in Brillouin optical time-domain analysis sensors by tracking the Brillouin frequency shift profile of the fiber 

      Mompó Roselló, Juan José Upna; Iribas Pardo, Haritz Upna; Urricelqui Polvorinos, Javier Upna; Loayssa Lara, Alayn Upna (IEEE, 2017)   Artículo / Artikulua  OpenAccess
      We report on an additional limitation that has been found in Brillouin optical time-domain analysis (BOTDA) sensors due to the so-called second-order nonlocal effects (NLE). Second-order NLE appear in BOTDA setups that ...
    • Sensing in coin discriminators 

      Carlosena García, Alfonso Upna; López Martín, Antonio Upna; Arizti, Fernando; Martínez de Guereñu, Ane; Pina Insausti, José L.; García Sayés, Miguel (IEEE, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper describes the technologies used in coin discriminator devices, stressing the improvements and novel mechanisms introduced by the authors in the past few years as a result of the cooperation with one leading ...
    • Sensitivity enhancement experimental demonstration using a low cutoff wavelength SMS modified structure coated with a pH sensitive film 

      Rodríguez-Rodríguez, W.E.; Del Villar, Ignacio Upna; Ruiz Zamarreño, Carlos Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Rodríguez Rodríguez, Adolfo Josué; Domínguez-Cruz, R.F. (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
      The multimode interference (MMI) effect in a single mode-multimode-single mode (SMS) can be used fordevelopment of wavelength shift detection based sensors. In this work, the focus is centered on obtainingwavelength shifts ...
    • Sensitivity enhancement in low cutoff wavelength long-period fiber gratings by cladding diameter reduction 

      Del Villar, Ignacio Upna; Partridge, Matthew; Rodríguez, Wenceslao; Fuentes Lorenzo, Omar Upna; Socorro Leránoz, Abián Bentor Upna; Díaz Lucas, Silvia Upna; Corres Sanz, Jesús María Upna; James, Stephen; Tatam, Ralph (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      The diameter of long-period fiber gratings (LPFGs) fabricated in optical fibers with a low cutoff wavelength was be reduced by hydrofluoric acid etching, enhancing the sensitivity to refractive index by more than a factor ...
    • Sensitivity improvement of a humidity sensor based on silica nanospheres on a long-period fiber grating 

      Viegas, Diana; Goicoechea Fernández, Javier Upna; Santos, José Luís; Araújo, Francisco Moita; Ferreira, Luis Alberto; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (MDPI, 2009)   Artículo / Artikulua  OpenAccess
      This work addresses a new configuration that improves the sensitivity of a humidity sensor based on a long-period fiber grating coated with a SiO(2)-nanospheres film. An intermediate higher refractive index overlay, ...
    • Sensitivity optimization with cladding-etched long period fiber gratings at the dispersion turning point 

      Del Villar, Ignacio Upna; Cruz, José Luis; Socorro Leránoz, Abián Bentor Upna; Corres Sanz, Jesús María Upna; Matías Maestro, Ignacio Upna (Optical Society of America, 2016)   Artículo / Artikulua  OpenAccess
      This work presents a refractive index sensor based on a long period fiber grating (LPFG) made in a reduced cladding fiber whose low order cladding modes have the turning point at large wavelengths. The combination of ...
    • Sensors based on thin-film coated cladding removed multimode optical fiber and single-mode multimode single-mode fiber: a comparative study 

      Del Villar, Ignacio Upna; Socorro Leránoz, Abián Bentor Upna; Hernáez Sáenz de Zaitigui, Miguel Upna; Corres Sanz, Jesús María Upna; Ruiz Zamarreño, Carlos Upna; Sánchez Zábal, Pedro Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (Hindawi Publishing Corporation, 2015)   Artículo / Artikulua  OpenAccess
      Two simple optical fibre structures that do not require the inscription of a grating, a cladding removed multimode optical fibre (CRMOF) and a single-mode multimode single-mode structure (SMS), are compared in terms of ...
    • Signal processing in ocean bottom seismographs for refraction seismology 

      Rodríguez Barbarin, Iban Upna; Mànuel Lázaro, Antonio; Carlosena García, Alfonso Upna; Bermúdez, Antoni; Río, Joaquín del; Panahi, Shahram Shariat (IEEE, 2006)   Artículo / Artikulua  OpenAccess
      This paper presents some experimental results on the application of signal processing techniques to underwater seismic signals. The novelty of this paper stems from the fact that it is the first paper, to the best of the ...
    • Simple modelling of DGS to design 1D-PBG low-pass filters 

      Garde Irigoyen, Ieltxu Aitor Upna; Yábar, Miguel Javier; Río Bocio, Carlos del Upna (Wiley, 2003)   Artículo / Artikulua  OpenAccess
      The use of defected ground structures (DGS) is being intensively explored by the microwave filter designer community. The DGSs are one possible implementation of a 1D Photonic Band Gap (1D-PBG) where some defect structures ...
    • Simplified Brillouin sensor for structural health monitoring applications based on passive optical filtering 

      Iribas Pardo, Haritz Upna; Urricelqui Polvorinos, Javier Upna; Mariñelarena Ollacarizqueta, Jon Upna; Sagüés García, Mikel Upna; Loayssa Lara, Alayn Upna (SPIE, 2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We present a simplified configuration for distributed Brillouin optical time domain analysis sensors. The technique is based on passive optical filtering of the spectral components generated in an RF-pulse-modulated optical ...
    • Simplifying the feeding network for multi-beam circular antenna arrays by using corps 

      Panduro, Marco A.; Río Bocio, Carlos del Upna (EMW Publishing, 2011)   Artículo / Artikulua  OpenAccess
      An innovative way to analyze the design of beam-forming networks (BFN) for scannable multi-beam circular antenna arrays using the CORPS (Coherently Radiating Periodic Structures) concept is introduced. This design of ...
    • Simultaneous and quasi-independent strain and temperature sensor based on microstructured optical fiber 

      López Aldaba, Aitor Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a new sensor system for simultaneous and quasi-independent strain and temperature measurements is presented. The interrogation of the sensing head has been carried out by monitoring the FFT phase variations ...
    • Simultaneous measurement of humidity and temperature based on a partially coated optical fiber long period grating 

      Urrutia Azcona, Aitor Upna; Goicoechea Fernández, Javier Upna; Ricchiuti, Amelia L.; Barrera, D.; Arregui San Martín, Francisco Javier Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      A humidity and temperature optical fiber sensor based on a long-period grating (LPG), which can provide simultaneous response to both magnitudes, is proposed and demonstrated via experiments. Previously, the LPG was fully ...
    • Simultaneous measurement of humidity and vibration based on a nanowire sensor system using Fast Fourier Transform technique 

      Rota Rodrigo, Sergio Upna; López Aldaba, Aitor Upna; Pérez Herrera, Rosa Ana Upna; López Bautista, María del Carmen; Esteban, Óscar; López-Amo Sáinz, Manuel Upna (IEEEOptical Society of America, 2016)   Artículo / Artikulua  OpenAccess
      This paper presents a new sensor system for vibration and relative humidity measurements based on its interaction with the evanescent field of a microwire. The interrogation of the sensing head is carried out by monitoring ...
    • Simultaneous measurement of strain and temperature based on clover microstructured fiber loop mirror 

      Pérez Herrera, Rosa Ana Upna; André, R. M.; Silva, S. F.; Becker, M.; Schuster, K.; Kobelke, J.; López-Amo Sáinz, Manuel Upna; Santos, José Luís; Frazão, Orlando (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
      In this work, two all-fiber loop mirrors using a clover microstructured fiber for the simultaneous measurement of temperature and strain are presented. The sensing heads are formed by a short piece of clover microstructured ...