Now showing items 21-40 of 183

  • Application of CAD load-pull techniques in mixer design 

    Velázquez, A.; Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Comerón Tejero, Adolfo (2003-02)
    Article
    Open Access
    This work describes the application of a commercial CAD software to implement load-pull techniques in the design of microwave mixers. This method is used to generate conversion-loss regions when a diode is pumped and ...
  • Application of the method of decomposition of lidar signal-to-noise ratio to the assessment of laser instruments for gaseous pollution detection 

    Agishev, Ravil R.; Comerón Tejero, Adolfo; Gross, B.; Moshary, F.; Ahmed, S.; Gilerson, A.; Vlasov, V.A. (2004-07)
    Article
    Open Access
    A general methodology for rating both performance and potential of lidar systems used for detection of atmospheric trace constituents including pollutants and gas leaks is developed. By individually examining and ...
  • Assessment of capabilities of lidar systems in day-and night-time under different atmospheric and internal-noise conditions 

    Agishev, Ravil R.; Comerón Tejero, Adolfo (2017)
    Conference report
    Open Access
    As an application of the dimensionless parameterization concept proposed earlier for the characterization of lidar systems, the universal assessment of lidar capabilities in day and night conditions is considered. The ...
  • Assessment of lidar inversion errors for homogeneous atmospheres 

    Rocadenbosch Burillo, Francisco; Comerón Tejero, Adolfo; Pineda, D (1998-04)
    Article
    Restricted access - publisher's policy
    The inversion of lidar returns from homogeneous atmospheres has been done customarily through the well-known slope method. The logarithmic operation over the range-corrected and system-normalized received signal used in ...
  • Assessment of lidar inversion errors for homogeneous atmospheres 

    Rocadenbosch Burillo, Francisco; Comerón Tejero, Adolfo; Pineda Masnou, Daniel (OPTICAL SOC AMER, 1998-04-30)
    Article
    Open Access
    The inversion of lidar returns from homogeneous atmospheres has been done customarily through the well-known slope method. The logarithmic operation over the range-corrected and system-normalized received signal used in ...
  • Assimilation of lidar signals: application to aerosol forecasting in the Mediterranean basin 

    Wang, Y; Sartelet, K. N.; Bocquet, M.; Sicard, Michaël; Comerón Tejero, Adolfo; García Vizcaíno, David; Muñoz Porcar, Constantino; Rocadenbosch Burillo, Francisco (2014-11-17)
    Article
    Open Access
    This paper presents a new application of assimilating lidar signals to aerosol forecasting. It aims at investigating the impact of a ground-based lidar network on the analysis and short-term forecasts of aerosols through ...
  • Atmospheric aerosol measurement with a network of advanced lidar instruments 

    Comerón Tejero, Adolfo; Sicard, Michaël; Rocadenbosch Burillo, Francisco; Muñoz Porcar, Constantino; Rodríguez Gómez, Alejandro Antonio; García Vizcaíno, David (2013-03-11)
    Article
    Restricted access - publisher's policy
    A European network of atmosphere sensors uses multi-wavelength elastic-Raman lidar instruments in its infrastructure.
  • Atmospheric dispersion of airborne pollen evidenced by near-surface and columnar measurements in Barcelona, Spain 

    Sicard, Michaël; Izquierdo Miguel, Rebeca; Jorba i Casellas, Oriol; Alarcón Jordán, Marta; Belmonte Soler, Jordina; Comerón Tejero, Adolfo; Linares, Concha De; Baldasano Recio, José María (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2016)
    Conference report
    Open Access
    Hourly measurements of pollen near-surface concentration and lidar-derived profiles of particle backscatter coefficients and of volume and particle depolarization ratios during a 5-day pollination event observed in Barcelona, ...
  • Atmospheric-turbulence-induced power-fade statistics for a multiaperture optical receiver 

    Belmonte Molina, Aniceto; Comerón Tejero, Adolfo; Rubio, Juan Antonio; Fernández (OPTICAL SOC AMER, 1997-01-31)
    Article
    Open Access
    To estimate the probability distributions of power fades, we consider two basic types of disturbance in electromagnetic wave propagation through atmospheric turbulence: wave-front intensity fluctuations and wave-front ...
  • Atmospheric-turbulence-induced power-fade statistics for a multiaperture optical reciever 

    Belmonte Molina, Aniceto; Comerón Tejero, Adolfo; Rubio, J.A.; Bará Temes, Francisco Javier; Fernández, E. (1997-01)
    Article
    Restricted access - publisher's policy
    To estimate the probability distributions of power fades, we consider two basic types of disturbance in electromagnetic wave propagation through atmospheric turbulence: wave-front intensity fluctuations and wave-front ...
  • Averaging of collected-power fluctuations by a multiaperture receiver system 

    Belmonte Molina, Aniceto; Comerón Tejero, Adolfo; Bará Temes, Francisco Javier; Antonio, Juan Rubio (1996-10)
    Article
    Restricted access - publisher's policy
    When a large aperture is used to collect light propagated through the atmosphere, it performs an average operation on the irradiance fluctuations, resulting in collected-power fluctuations that are not as large as those ...
  • Averaging of collected-power fluctuations by a multiaperture receiver system 

    Belmonte Molina, Aniceto; Comerón Tejero, Adolfo; Bará Temes, Francisco Javier; Rubio, Juan Antonio (SPIE-INT SOCIETY OPTICAL ENGINEERING, 1996-10-31)
    Article
    Open Access
    When a large aperture is used to collect light propagated through the atmosphere, it performs an average operation on the irradiance fluctuations, resulting in collected-power fluctuations that are not as large as those ...
  • Cálculo teórico de la relación señal a ruido en función del tamaño de la apertura receptora de un anemómetro láser doppler (LDA) 

    García Vizcaíno, David; Recolons Martos, Jaume; Dios Otín, Víctor Federico; Comerón Tejero, Adolfo (2004-09)
    Conference report
    Open Access
    From the expressions by Adrian and Earley (Proceeding of Minessota Symposium on Laser Anemometry, University of Minessota, Dept. of Conference, Minneapolis, 1976), we have calculated the signal-to-noise ratio of a Laser ...
  • Calibration of Raman lidar water-vapor mixing ratio measurements using zenithal measurements of diffuse sunlight and a radiative transfer model 

    Muñoz Porcar, Constantino; Comerón Tejero, Adolfo; Sicard, Michaël; Barragán Cuesta, Rubén; García Vizcaíno, David; Rodríguez Gómez, Alejandro Antonio; Rocadenbosch Burillo, Francisco; Granados Muñoz, María José (Institute of Electrical and Electronics Engineers (IEEE), 2018-07-20)
    Article
    Open Access
    Among the different techniques available for measuring the atmospheric water vapor content, Raman lidars stand out as accurate instruments providing detailed profiles with high temporal and altitude resolution. Their ...
  • Caracterización de los pulsos generados mediante q-switching en un transmisor laser 

    Fabrega, F J; Puente Baliarda, Carles; Rocadenbosch Burillo, Francisco; Comerón Tejero, Adolfo (Publicaciones de la Universidad de Valladolid, 1995)
    Conference report
    Open Access
    In this paper, a model to characterizc Q-switched laser pulses is described. In the power cycle this model takes into account two different equations, one for the time rate of change of the photon density within the small ...
  • Caracterización de transistores de Microoendas mediante la técnica de Calibrción TRL 

    Pradell i Cara, Lluís; Sabater, C; Artal, E; Comerón Tejero, Adolfo; Corbella Sanahuja, Ignasi (-, 1989)
    Conference report
    Open Access
  • Caracterización de transistores de microondas mediante la técnica de calibración TRL 

    Pradell i Cara, Lluís; Artal, Eduardo; Comerón Tejero, Adolfo; Corbella Sanahuja, Ignasi; Sabater, C. (1989)
    Conference report
    Open Access
    In this paper, the design of a Microstrip Test Fixture for TRL calibration is described. Experimental results for S-parameters measurement of a GaAs FET chip in the 3-22 GHz frequency range are presented. Repeatability of ...
  • CI de microondas. Aplicaciones y mercado 

    Artal, Eduardo; Comerón Tejero, Adolfo; Corbella Sanahuja, Ignasi (1988-10)
    Article
    Restricted access - publisher's policy
  • CI de microondas. Tecnologías 

    Artal, Eduardo; Comerón Tejero, Adolfo; Corbella Sanahuja, Ignasi (1988-09)
    Article
    Restricted access - publisher's policy
    Los circuitos integrados monolíticos de microondas presentan ventajas potenciales respecto de los circuitos híbridos habituales en cuanto a fiabilidad, reducido tamaño y peso, banda ancha y bajo coste. Se describe el estado ...
  • Compact and Simple X 3 (9 to 27 GHz) Pll Frequency Multiplier Using Harmonic Phase Detection 

    Berenguer Sau, Jordi; Comerón Tejero, Adolfo (1987)
    Conference report
    Open Access
    Frequency multiplication in the microwave and millimeter-wave range can be performed in compact form using harmonic phase detectors, in which the veo phase is directly compared to a multiple of the reference frequency ...