Examinando por Autor "Velásquez, D."

Mostrando 1 - 8 de 8
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    Ítem
    A computational method to acquired hogel images used in full parallax holographic stereograms
    (OSA - The Optical Society, 2016-01-01) Sánchez, A.M.; Velásquez, D.; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica Aplicada
    Holographic stereogram displays require 2D image sequences with a distribution of multiple perspectives of the object. This paper propose a computational method to generate the required images to record full parallax holographic stereograms. © OSA 2016.
  • Miniatura
    Ítem
    Diffraction efficiency adjustment to record high quality color holograms
    (Universidad EAFIT, 2015-08-06) Velásquez, D.; Giraldo, L.M.; Universidad EAFIT; Karlsruhe Institute of Technology
  • No hay miniatura disponible
    Ítem
    Obtaining relief structures in silver halide materials
    (Sociedad Espanola de Optica, 2013-01-01) Giraldo, L.M.; Velásquez, D.; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica Aplicada
    Diffraction transmission gratings were recorded in AGFA-8E75 film, chemically treated under processes with D-19 + potassium ferrocyanide and a chemical processing technique proposed for PE-2 film to obtain embossed stripes. Holographic structures were measured topographically by the technique of atomic force microscopy in noncontact mode (NC-AFM) and we observe changes in the depths under variations in exposures and used photochemistry. We find that the best performance in terms of relief depth obtained is given by the conventional process which reached depths between 0.15 µm and 0.3 µm for spatial frequencies of the order of 400
  • No hay miniatura disponible
    Ítem
    Obtención de estructuras de relieve en materiales de registro de haluros de plata
    (Sociedad Española de Óptica, 2013-01) Giraldo, L.M; Velásquez, D.; Giraldo, L.M; Velásquez, D.; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica Aplicada
    Diffraction transmission gratings were recorded in AGFA-8E75 film, chemically treated under processes with D-19 + potassium ferrocyanide and a chemical processing technique proposed for PE-2 film to obtain embossed stripes. Holographic structures were measured topographically by the technique of atomic force microscopy in noncontact mode (NC-AFM) and we observe changes in the depths under variations in exposures and used photochemistry. We find that the best performance in terms of relief depth obtained is given by the conventional process which reached depths between 0.15 m and 0.3 m for spatial frequencies of the order of 400
  • No hay miniatura disponible
    Ítem
    Optical design of a high-power LED-based solar simulator
    (SPIE-INT SOC OPTICAL ENGINEERING, 2016-01-01) Toro, Veronica; Velasquez, Alejandro; Velásquez, D.; Acevedo, David Felipe; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica Aplicada
    The optical design of a High-Power LED based Solar Simulator was made in order to reach the AM1.5G spectrum standards. An optical model of the light emitted by the LEDs was made and used for spectral intensities calculations and the light intensity uniformity was optimized. A class AAA solar simulator was designed using a hexagonal LED distribution.
  • No hay miniatura disponible
    Ítem
    Optical design of a high-power LED-based solar simulator
    (SPIE-INT SOC OPTICAL ENGINEERING, 2016-01-01) Toro, Veronica; Velasquez, Alejandro; Velásquez, D.; Acevedo, David Felipe
    The optical design of a High-Power LED based Solar Simulator was made in order to reach the AM1.5G spectrum standards. An optical model of the light emitted by the LEDs was made and used for spectral intensities calculations and the light intensity uniformity was optimized. A class AAA solar simulator was designed using a hexagonal LED distribution.
  • No hay miniatura disponible
    Ítem
    Optical design of a high-power LED-based solar simulator
    (SPIE-INT SOC OPTICAL ENGINEERING, 2016-01-01) Toro, Veronica; Velasquez, Alejandro; Velásquez, D.; Acevedo, David Felipe; Toro, Veronica; Velasquez, Alejandro; Velásquez, D.; Acevedo, David Felipe; Universidad EAFIT. Departamento de Ciencias; Electromagnetismo Aplicado (Gema)
    The optical design of a High-Power LED based Solar Simulator was made in order to reach the AM1.5G spectrum standards. An optical model of the light emitted by the LEDs was made and used for spectral intensities calculations and the light intensity uniformity was optimized. A class AAA solar simulator was designed using a hexagonal LED distribution.
  • No hay miniatura disponible
    Ítem
    Optical design of a high-power LED-based solar simulator
    (SPIE-INT SOC OPTICAL ENGINEERING, 2016-01-01) Toro, Veronica; Velasquez, Alejandro; Velásquez, D.; Acevedo, David Felipe; Toro, Veronica; Velasquez, Alejandro; Velásquez, D.; Acevedo, David Felipe; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecatrónica y Diseño de Máquinas
    The optical design of a High-Power LED based Solar Simulator was made in order to reach the AM1.5G spectrum standards. An optical model of the light emitted by the LEDs was made and used for spectral intensities calculations and the light intensity uniformity was optimized. A class AAA solar simulator was designed using a hexagonal LED distribution.