Now showing items 1-20 of 32

    • A wind-lidar buoy for offshore wind measurements: first commissioning test-phase results 

      Gutiérrez Antuñano, Miguel Ángel; Tiana Alsina, Jordi; Rocadenbosch Burillo, Francisco; Sospedra, Joaquim; Aghabi, Rajai; González Marco, Daniel (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference lecture
      Restricted access - publisher's policy
      This paper presents the development of a new commercial floating lidar system aimed to measure the wind resource and other environmental variables at candidate wind farm locations. This work describes this new lidar system ...
    • Atmospheric boundary layer height estimation using combined microwave radiometer and lidar data 

      Saeed, Umar; Tiana Alsina, Jordi; Crewell, Susanne; Rocadenbosch Burillo, Francisco (2014)
      Conference lecture
      Restricted access - publisher's policy
      The estimation of atmospheric boundary layer height (ABLH) during a full diurnal cycle using ground-based remote sensing instruments is one of the key challenges in atmospheric science. Most of these instruments such as ...
    • Atmospheric boundary layer height monitoring using a kalman filter and backscatter lidar returns 

      Lange, Diego; Tiana Alsina, Jordi; Saeed, Umar; Tomás Martinez, Sergio; Rocadenbosch Burillo, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2014-08-01)
      Article
      Restricted access - publisher's policy
      A solution based on a Kalman filter to trace the evolution of the atmospheric boundary layer (ABL) sensed by a ground-based elastic-backscatter tropospheric lidar is presented. An erf-like profile is used to model the ...
    • Atmospheric boundary-layer height estimation using a Kalman filter and a frequency-modulated continuous-wave radar 

      Lange, Diego; Rocadenbosch Burillo, Francisco; Tiana Alsina, Jordi; Frasier, Steve (Institute of Electrical and Electronics Engineers (IEEE), 2015-06-01)
      Article
      Open Access
      An adaptive solution based on an Extended Kalman Filter (EKF) is proposed to estimate the Atmospheric Boundary-Layer Height (ABLH) from Frequency-Modulated Continuous-Wave (FMCW) S-band weather-radar returns. The EKF ...
    • Characterization of speckle patterns generated by a semiconductor laser with optical feedback for speckle reduction in retinal imaging instruments 

      Halpaap, Donatus; Tiana Alsina, Jordi; Vilaseca Ricart, Meritxell; Masoller Alonso, Cristina (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2019)
      Conference lecture
      Restricted access - publisher's policy
      We study experimentally the operating conditions of a semiconductor laser diode subjected to different amounts of optical feedback in order to find a stable and cost-efficient solution for speckle reduction in double-pass ...
    • Comparing the dynamics of periodically forced lasers and neurons 

      Tiana Alsina, Jordi; Quintero Quiroz, Carlos Alberto; Masoller Alonso, Cristina (2019-10-21)
      Article
      Open Access
      Neuromorphic photonics is a new paradigm for ultra-fast neuro-inspired optical computing that canrevolutionize information processing and artificial intelligence systems. To implement practicalphotonic neural networks is ...
    • Concept design of a multiwavelength aerosol lidar system with mitigated diattenuation effects and depolarization-measurement capability 

      Comerón Tejero, Adolfo; Sicard, Michaël; Vidal Calvo, Eric; Barragán Cuesta, Rubén; Muñoz Porcar, Constantino; Rodríguez Gómez, Alejandro Antonio; Tiana Alsina, Jordi; Rocadenbosch Burillo, Francisco; García Vizcaíno, David (2015)
      Conference lecture
      Restricted access - publisher's policy
      It is known that the retrieval of aerosol extinction and backscatter coefficients from lidar data acquired through so-called total-power channels – intended to measure the backscattered power irrespective of the polarization ...
    • Distinguishing signatures of determinism and stochasticity in spiking complex systems 

      Aragoneses Aguado, Andrés; Rubido, Nicolás; Tiana Alsina, Jordi; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (2013-05-07)
      Article
      Open Access
    • Estimation of the motion-induced horizontal-wind-speed standard deviation in an offshore doppler lidar 

      Gutiérrez Antuñano, Miguel Ángel; Tiana Alsina, Jordi; Salcedo, A.; Rocadenbosch Burillo, Francisco (Multidisciplinary Digital Publishing Institute (MDPI), 2018-12-14)
      Article
      Open Access
      This work presents a new methodology to estimate the motion-induced standard deviation and related turbulence intensity on the retrieved horizontal wind speed by means of the velocity-azimuth-display algorithm applied to ...
    • Experimental characterization of the speckle pattern at the output of a multimode optical fiber 

      Halpaap, Donatus; Tiana Alsina, Jordi; Vilaseca Ricart, Meritxell; Masoller Alonso, Cristina (2019-09-30)
      Article
      Open Access
      Speckle patterns produced by coherent waves interfering with each other are undesirable in many imaging applications (for example, in laser projection systems) but on the other hand, they contain useful information that ...
    • Experimental characterization of the transition to coherence collapse in a semiconductor laser with optical feedback 

      Panozzo, M.; Quintero Quiroz, Carlos Alberto; Tiana Alsina, Jordi; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (Institute of Physics (IOP), 2017-11-01)
      Article
      Open Access
      Semiconductor lasers with time-delayed optical feedback display a wide range of dynamical regimes, which have found various practical applications. They also provide excellent testbeds for data analysis tools for characterizing ...
    • Experimental study of different LFF regimes in semiconductor lasers with an external cavity 

      Aragoneses Aguado, Andrés; Zamora Munt, Jordi; Tiana Alsina, Jordi; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (2011)
      Conference lecture
      Restricted access - publisher's policy
    • Experimental study of modulation waveforms for entraining the spikes emitted by a semiconductor laser with optical feedback 

      Tiana Alsina, Jordi; Quintero Quiroz, Carlos Alberto; Panozzo, M.; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (2018-04-02)
      Article
      Open Access
      The entrainment phenomenon, by which an oscillator adjusts its natural rhythm to an external periodic signal, has been observed in many natural systems. Recently, attention has focused on which are the optimal conditions ...
    • Experimental study of speckle patterns generated by low-coherence semiconductor laser light 

      Halpaap Halpaap, Herbert Donatus; Marconi, Mathias; Yacomotti, Alejandro M.; Tiana Alsina, Jordi; Masoller Alonso, Cristina (Institute of Physics (IOP), 2020-06-01)
      Article
      Restricted access - publisher's policy
      Speckle is a wave interference phenomenon that has been studied in various fields, including optics, hydrodynamics, and acoustics. Speckle patterns contain spectral information of the interfering waves and of the scattering ...
    • Extrinsic behaviour of PZT ceramics near the morphotropic phase transition 

      Albareda Tiana, Alfonso; Pérez Pérez, Rafael; García García, José Eduardo; Tiana Alsina, Jordi; Pérez Codina, Estel (2005-09)
      Article
      Open Access
      The aim of this work is to study the dependence of the linear and non-linear dielectric, piezoelectric and mechanical coefficients on the Ti fraction in PZT ceramic compositions near the morphotropic phase boundary. The ...
    • Extrinsic coefficient characterisation of PZT ceramics near the morphotropic phase boundary 

      Albareda Tiana, Alfonso; Pérez Pérez, Rafael; García García, José Eduardo; Tiana Alsina, Jordi; Pérez Codina, Estel; Gorri Ochoa, José Antonio (2006-05)
      Article
      Open Access
      El comportamiento extrínseco de las cerámicas PZT, relacionado con el movimiento de las paredes de los dominios, comporta efectos no lineales grandes. Esta correspondencia entre efectos extrínsecos y no linealidades puede ...
    • Lag alternance in unidirectional coupled semiconductor lasers 

      Tiana Alsina, Jordi; García López, J.H.; Torrent Serra, Maria del Carmen; García Ojalvo, Jordi (2009)
      Conference report
      Open Access
    • Motion compensation study for a floating Doppler wind lidar 

      Tiana Alsina, Jordi; Gutiérrez Antuñano, Miguel Ángel; Würth, Inés; Puigdefàbregas Sagristà, Joan; Rocadenbosch Burillo, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Restricted access - publisher's policy
      This paper addresses a cardanic frame as mechanical-compensation device for a Doppler-wind lidar installed on a floating sea buoy as the “moving” lidar. From the methodological point of view, the horizontal wind speed (HWS) ...
    • Multi-wavelength aerosol LIDAR signal pre-processing: practical considerations 

      Rodríguez Gómez, Alejandro Antonio; Rocadenbosch Burillo, Francisco; Sicard, Michaël; Lange, Diego; Barragán Cuesta, Rubén; Batet Torrell, Óscar; Comerón Tejero, Adolfo; López Márquez, Miguel Ángel; Muñoz Porcar, Constantino; Tiana Alsina, Jordi; Tomás Martínez, Sergio (2015-12)
      Article
      Open Access
      Elastic lidars provide range-resolved information about the aerosol content in the atmosphere. Nevertheless, a number of pre-processing techniques need to be used before performing the inversion of the detected signal: ...
    • Multi-wavelength aerosol LIDAR signal pre-processing: practical considerations 

      Rodríguez Gómez, Alejandro Antonio; Rocadenbosch Burillo, Francisco; Sicard, Michaël; Lange Vega, Diego; Barragán Cuesta, Rubén; Batet Torrell, Óscar; Comerón Tejero, Adolfo; López Márquez, Miguel Ángel; Muñoz Porcar, Constantino; Tiana Alsina, Jordi; Tomás Martínez, Sergio (Institute of Physics (IOP), 2015)
      Conference report
      Open Access
      Elastic lidars provide range-resolved information about the aerosol content in the atmosphere. Nevertheless, a number of pre-processing techniques need to be used before performing the inversion of the detected signal: ...