Exploració per tema "Doppler effect"

Ara es mostren els items 1-20 de 24

    • A measure of flow vorticity with twisted beams of light 

      Belmonte Molina, Aniceto; Rosales Guzmán, Carmelo; Pérez Torres, Juan (Curran, 2016)
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      Accés restringit per política de l'editorial
      The measurement of vorticity, a parameter providing local measurements of rotation at every point in a flow, would greatly assist research fields as diverse as biology microfluidics, complex motions in the oceanic and ...

    • Aircraft localization using a passive acoustic method. Experimental test 

      Martín Román, Sara-Regina; Genesca Francitorra, Meritxell; Romeu Garbí, Jordi; Clot Razquin, Arnau (2016-01)
      Article
      Accés obert
      A passive acoustic method for aircraft localization is experimentally tested in this paper. The method relies on the Doppler effect influencing the signals received by a mesh of microphones distributed over the acoustic ...

    • Aircraft tracking by means of the Acoustical Doppler Effect 

      Martín Román, Sara-Regina; Genesca Francitorra, Meritxell; Romeu Garbí, Jordi; Pàmies Gómez, Teresa (2013-07)
      Article
      Accés restringit per política de l'editorial
      The present paper presents a passive acoustic method for aircraft tracking. The Acoustical Doppler Effect, characteristic of signals received by a mesh of spatially distributed microphones is the basis of the method. A ...

    • Analyzing Anomalous Artefacts in TDS-1 Delay Doppler Maps 

      Hu, Changjiang; Benson, Craig; Hyuk, Park; Camps Carmona, Adriano José; Li, Qiao; Rizos, Chris (2019)
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      Global Navigation Satellite System Reflectometry (GNSS-R) uses the GNSS reflected signals to study parameters of the Earth's surface such as ocean surface height, wind speed, soil moisture, sea surface target detection. ...

    • Channel maps and stochastic models in elevation based on measurements in operating networks 

      Yu, Jiwei; Yin, Xuefeng; Chen, Jiajing; Zhang, Nan; Zhong, Zhimeng; Duan, Weiming; Ruiz Boqué, Sílvia (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      In this contribution, a channel measurement campaign recently carried out in the Jiading campus of Tongji University, Shanghai, China, is introduced. The downlink signals of an active Universal Mobile Telecommunications ...

    • Confocal flowmeter based on self-mixing interferometry for real-time velocity profiling of turbid liquids flowing in microcapillaries 

      Yáñez Alvarado, Carlos René; Azcona Guerrero, Francisco Javier; Royo Royo, Santiago (2019-08-19)
      Article
      Accés obert
      We propose a new confocal device for flow profiling in microcapillaries. A viewfinder system is developed using a visible light microscope, allowing focusing with high precision an 830 nm Fabry-Perot laser diode on a ...

    • Data comparison between three acoustic doppler current profilers deployed in OBSEA platform in North-Western Mediterranean 

      Carandell Widmer, Matias; Nogueras Cervera, Marc (SARTI, 2016)
      Comunicació de congrés
      Accés obert
      Three different Acoustic Doppler Current Profilers (ADCP) have been deployed in OBSEA platform, a 20 meters depth underwater observatory cabled with a 4 km mixt cable to Vilanova i la Geltru’s coast. Two months of ...

    • Data comparison between three acoustic doppler current profilers deployed in OBSEA platform in north-western Mediterranean 

      Carandell Widmer, Matias; Nogueras Cervera, Marc; Chumbinho, Rogério; Molina, Cristiobal (2016)
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      Three different Acoustic Doppler Current Profilers (ADCP) have been deployed in OBSEA platform, a 20 meters depth underwater observatory cabled with a 4 km mixt cable to Vilanova i la Geltru’s coast. Two months of continuous ...

    • Direction-sensitive transverse velocity measurement by phase-modulated structured light beams 

      Rosales Guzmán, Carmelo; Hermosa, Nathaniel; Belmonte Molina, Aniceto; Pérez Torres, Juan (2014-09-15)
      Article
      Accés restringit per política de l'editorial
      The use of structured light beams to detect the velocity of targets moving perpendicularly to the beam's propagation axis opens new avenues for remote sensing of moving objects. However, determining the direction of motion ...

    • Evaluation of AUV-borne ADCP measurements in different navigation modes 

      Nogueras Cervera, Marc; Antonijuan Rull, Josefina; Masmitjà Rusiñol, Ivan; Río Fernandez, Joaquín del (IEEE Press, 2017)
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      Most Autonomous Underwater Vehicles (AUVs) mount an Acoustic Doppler Current Profilers (ADCP). Data from this sensor are rarely used in scientific studies due to the complexity of its processing and the lack of validation. ...

    • Experimental detection of transverse particle movement with structured light 

      Rosales Guzmán, Carmelo; Hermosa, Nathaniel; Belmonte Molina, Aniceto; Pérez Torres, Juan (MACMILLAN PUBLISHERS LIMITED, 2013-10-02)
      Article
      Accés obert
      One procedure widely used to detect the velocity of a moving object is by using the Doppler effect. This is the perceived change in frequency of a wave caused by the relative motion between the emitter and the detector, ...

    • First Delay Doppler Maps obtained with the Microwave Inteferometric Reflectometer (MIR) 

      Pascual, Daniel; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Alonso Arroyo, Alberto; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      This work presents the first Delay Doppler Maps (DDMs) obtained with the Microwave Interferometric Reflectometer (MIR) airborne instrument. MIR is a GNSS Reflectometer (GNSS-R) which uses the conventional (cGNSS-R) and ...

    • First Delay Doppler Maps obtained with the Microwave Interferometric Reflectometer (MIR) 

      Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Alonso Arroyo, Alberto; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      The use of Global Navigation Satellite System (GNSS) signals for mesoscale altimetry was first proposed in [1]. Since then, many experiments and a couple of space missions have been carried out to validate the concept in ...

    • Improvement of PAU/PARIS end-to-end performance simulator (P2EPS): land scattering including topography 

      Hyuk, Park; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Alonso Arroyo, Alberto; Querol Borràs, Jorge; Onrubia Ibáñez, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      This work presents an improvement of the P2EPS end-to-end simulator to assess the performances of Global Navigation Satellite System Reflectometry (GNSS-R) space missions over land. Beyond the single specular reflection ...

    • Measurement of flow vorticity with helical beams of light 

      Belmonte Molina, Aniceto; Rosales Guzmán, Carmelo; Torres, Juan P. (Optical Society of American (OSA), 2015-11-20)
      Article
      Accés obert
      It is possible to devise an experiment in which the local vorticity of a flow can be estimated by probing the fluid with Laguerre–Gauss (LG) beams, i.e., optical beams that show an azimuthal phase variation that is the ...

    • Medición confocal de la velocidad con que una emulsión fluye en el centro de un capilar utilizando interferometría realimentada 

      Yáñez Alvarado, Carlos René; Royo Royo, Santiago (Asociación Científica de Óptica y Fotónica de Santiago, 2017)
      Comunicació de congrés
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      En este trabajo se presenta un novedoso sistema confocal de flujometría láser Doppler. Por medio de una técnica de interferometría realimentada, se infiere la frecuencia Doppler relativa a la velocidad con que fluye una ...

    • On cosmological expansion and local physics 

      Pons Ràfols, Josep Maria; Talavera Sánchez, Pedro (2021-11)
      Article
      Accés obert
      We find an exact convergence in the local dynamics described by two supposedly antagonistic approaches in modern cosmology: one starting from an expanding universe perspective such as FLRW, the other based on a local model ...

    • On the choice of the number of samples in laser Doppler anemometry signal processing 

      Dios Otín, Víctor Federico; Comerón Tejero, Adolfo; García Vizcaíno, David (2001-05)
      Article
      Accés obert
      The minimum number of samples that must be taken from a sinusoidal signal affected by white Gaussian noise, in order to find its frequency with a predetermined maximum error, is derived. This analysis is of interest in ...

    • Optical feedback flowmetry: impact of particle concentration on the signal processing method 

      Atashkhooei, Reza; Ramírez Miquet, Evelio E.; Moreira, Raul da Costa; Quotb, Adam; Royo Royo, Santiago; Perchoux, Julien (2017-12-11)
      Article
      Accés obert
      IEEE Optical feedback interferometry (OFI) based flowmetry enables simple, robust, self-aligned and low cost systems to measure the fluid flow velocity with reasonable accuracy. The particle concentration in the fluid ...

    • Passive acoustic method for aircraft states estimation based on the Doppler effect 

      Martín Román, Sara-Regina; Genesca Francitorra, Meritxell; Romeu Robert, Jordi; Arcos Villamarín, Robert (2014-04-01)
      Article
      Accés restringit per política de l'editorial
      A passive acoustic method to locate moving sound sources is applied to maneuvering aircraft. The advantages of the method are that it is suitable for all kinds of aircraft, not only propeller-driven, and is not restricted ...