Now showing items 1-20 of 23

    • Alimentació adaptativa d'un generador d'ultrasons de potència basada en un convertidor ressonant paral.lel controlat per un DSC 

      Calduch Cobos, Rubén (Universitat Politècnica de Catalunya, 2010-12-15)
      Master thesis (pre-Bologna period)
      Open Access
      Català: Disseny i fabricació d'una font d'alimentació per a transductors d'ultrasons de potència. Font d'alimentació formada per un convertidor ressonant DC/AC i controlada per un DSC que corregeix la freqüencia de sortida ...
    • Desarrollo de un pulser / amplificador para transductores de ultrasonidos 

      Tremosa Hernández, Roger (Universitat Politècnica de Catalunya, 2020-06-29)
      Bachelor thesis
      120 months embargo
    • Design of a GUI based on the implemented IEEE1451 Standard in a Wireless Sensor Network 

      Ardanuy Comas, Xavier (Universitat Politècnica de Catalunya, 2014-07-24)
      Bachelor thesis
      Open Access
      Covenantee:   Technische Universität Berlin
      [ANGLÈS] Wireless Sensor Networks are widely used in different fields for monitoring and controling purposes. The family of standards IEEE1451 defines a set of communications interfaces between the sensors and the ...
    • Design project of a miniature load transducer. 

      Uriz Rosich, Victor (Universitat Politècnica de Catalunya, 2014-06-26)
      Bachelor thesis
      Restricted access - author's decision
      In this project the design of a compact load transducer is proposed in order to know the tensile load of wires under their operational conditions. This transducer will consist basically of two components, an elastic ...
    • Double Optical Feedback Interferomety for biomedical applications 

      Arasanz Tena, Andrés (Universitat Politècnica de Catalunya, 2013-07-19)
      Master thesis
      Open Access
      [ANGLÈS] Optical Feedback Interferometry (OFI) and Double Optical Feedback interferometry (DOFI) are studied as non-invasive techniques for biomedical measurements. Due to its compactness and cost-effectiveness, both sensors ...
    • Estudi i caracterització de la resposta elèctrica d’elements piezoelèctrics davant diferents excitacions 

      Ortega Olivares, Jordi (Universitat Politècnica de Catalunya, 2017-06)
      Bachelor thesis
      Open Access
      L’objectiu d’aquest estudi és determinar les condicions òptimes de les tensions mecàniques, vibracions, a les que estaran sotmesos els transductors piezoelèctrics del tipus PI-876.A12 per aconseguir la màxima resposta ...
    • Evaluation of trr distorting effects reduction in DCI-NPC multilevel power amplifiers by using SiC diodes and MOSFET technologies 

      Sala Caselles, Vicenç; Resano, Tomas; Romeral Martínez, José Luis; Moreno Eguilaz, Juan Manuel (Curran, 2013)
      Conference report
      Restricted access - publisher's policy
      In the last decade, the Power Amplifier applications have used multilevel diode-clamped-inverter or neutral-point-clamped (DCI-NPC) topologies to present very low distortion at high power. In these applications a lot of ...
    • High voltage pulser for NDE air-coupled lamb wave ultrasonic system 

      García Rodríguez, Mercedes; Arjones, V.; Yañez, Y.; García Hernández, Miguel J.; Salazar Soler, Jorge; Turó Peroy, Antonio; Chávez Domínguez, Juan Antonio (American Institute of Physics (AIP), 2010)
      Conference report
      Restricted access - publisher's policy
      This paper describes a high voltage pulser developed for an air-coupled ultrasonic array NDE system based on Lamb waves. Unlike the classical single pulse excitation circuits, this pulser is able to generate a bipolar ...
    • Implementación de un transponder 64QAM en FPGA mediante Simulink 

      Alonso Varela, Marc (Universitat Politècnica de Catalunya, 2016-09)
      Bachelor thesis
      Open Access
      The current evolution of communication systems has been driven by the high demand of resources that are needed to satisfy services which are dependent of the network. To contain the high requirements of current and emerging ...
    • Laser interferometric measurements of air-coupled lamb waves 

      García Rodríguez, Mercedes; Yañez, Y.; García Hernández, Miguel J.; Salazar Soler, Jorge; Turó Peroy, Antonio; Chávez Domínguez, Juan Antonio (American Institute of Physics (AIP), 2010)
      Conference report
      Restricted access - author's decision
      In this paper, experimental measurements of the vibration pattern that results when an air-coupled A0 Lamb wave mode propagates in a plate are presented. Lamb waves are generated using an air-coupled piezoelectric transducer ...
    • Low Consumption Flux-Gate Transducer 

      Román Lumbreras, Manuel; Velasco Quesada, Guillermo; Conesa Roca, Alfons; Jerez, Felipe (2009-07)
      Article
      Open Access
    • New insights into the optical control of macroscopic polarization in ferroelectric crystals 

      Páez Margarit, David (Universitat Politècnica de Catalunya, 2017-06)
      Bachelor thesis
      Open Access
    • New strategy to minimize dead-time distortion in DCI-NPC power amplifiers using COE-error injection 

      Resano, Tomas; Sala Caselles, Vicenç; Romeral Martínez, José Luis; Moreno Eguilaz, Juan Manuel (Curran, 2013)
      Conference report
      Restricted access - publisher's policy
      The DCI-NPC topology has become one of the best options to optimize energy efficiency in the world of high power and high quality amplifiers. This can use an analog PWM modulator that is sensitive to generate distortion ...
    • Novel readout techniques for nanoelectromechanical resonators 

      Fernández-Tenllado Arribas, José María (Universitat Politècnica de Catalunya, 2017-05)
      Master thesis
      Restricted access - author's decision
      Covenantee:   École polytechnique fédérale de Lausanne
      Nanoelectromechanical resonators have shown outstanding performance in mass sensing and heavy filtering applications due to their exceptional sensitivities and high quality factors, among other characteristics. The ...
    • Nueva plataforma dinamométrica para el análisis y valoración del rendimiento deportivo 

      Sánchez Lacuesta, J.; Comín, M.; Prat, J.; Soler, C.; Dejoz, R.; Peris, J. L.; Hoyos, J.V.; Vera, P. (Sociedad Ibérica de Biomecánica y Biomateriales, 1993)
      Article
      Open Access
      Un nuevo modelo de plataforma dinamométrica ha sido desarrollado por el Instituto de Biomecánica de Valencia (IBV) y se han fabricado sus primeros prototipos. Permite la medida de la fuerza de reaccipón tridimensional, en ...
    • Projecte de disseny mecànic per a una bàscula de precisió per al pesat i centrat de planadors 

      Garcia Valero, Jordi (Universitat Politècnica de Catalunya, 2017-06-20)
      Master thesis
      Restricted access - author's decision
    • Sistema de localització per ultrasons 

      Reales Ferreres, Josep (Universitat Politècnica de Catalunya, 2016-10)
      Master thesis (pre-Bologna period)
      Restricted access - author's decision
      The project aims to develop an integral hardware-software system to detect the position of an object in the near zone using a low cost ultra-wave transducer. The project will use a development board from the same author.
    • Spectral learning of general weighted automata via constrained matrix completion 

      Balle Pigem, Borja de; Mohri, Mehryar (2012)
      Conference lecture
      Open Access
      Many tasks in text and speech processing and computational biology require estimating functions mapping strings to real numbers. A broad class of such functions can be defined by weighted automata. Spectral methods based ...
    • Spectral learning of transducers over continuous sequences 

      Recasens, Adria; Quattoni, Ariadna Julieta (2013-01-01)
      External research report
      Open Access
      In this paper we present a spectral algorithm for learning weighted nite state transducers (WFSTs) over paired input-output sequences, where the input is continuous and the output discrete. WFSTs are an important tool for ...
    • Splitting of the ultrasounic beam path in clamp-on ultrasonic flowmeters due to propagation through dispersive materials 

      Millán Blasco, Oliver; Salazar Soler, Jorge; Chávez Domínguez, Juan Antonio; Turó Peroy, Antonio; García Hernández, Miguel J. (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      This article explains how a multi-frequency ultrasonic beam path is split due to passing through dispersive materials and the implications that it has in flow measurement using a Clamp-on ultrasonic flowmeter. The importance ...