• Fringe visibility analysis with different scale apertures in speckle photography 

    Angel, L; Tebaldi, M; Trivi, M; Bolognini, N (TAYLOR & FRANCIS LTD, 2001-09-15)
    The use of different scale aperture pupils for image recording in speckle photography is analysed. In particular a double-exposure specklegram is considered. The ensemble-average intensity in the Fourier plane is analytically ...
  • Phase-object detection by use of double-exposure fringe-modulated speckle patterns 

    Tebaldi, Myrian; Trivi, Marcelo; Bolognini, Néstor; Angel-Toro, Luciano; Tebaldi, Myrian; Trivi, Marcelo; Bolognini, Néstor; Angel-Toro, Luciano (OSA; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2003-01)
    We study the properties of a double-exposure image specklegram of a diffuse object obtained by use of a doubleaperture pupil. A phase object is placed in front of one aperture during the first or the second exposure. Also, ...
  • Soap film analysis by speckle interferometer 

    Tebaldi, M.; Ángel, L.; Trivi, M.; Bolognini, N. (SPIE-INT SOC OPTICAL ENGINEERING, 2003-01-01)
    In this paper a soap film is characterized by using a speckle interferometer. The arrangement consists of a double-exposure specklegram obtained through a double-aperture system, by introducing a wedge in front of one ...
  • Speckle interferometric technique to assess soap films 

    Ángel Toro, Luciano; Bolognini, Néstor Alberto; Tebaldi, Myrian Cristina; Trivi, Marcelo Ricardo (Elsevier B.V., 2003-10-17)
    An speckle interferometric technique to monitor the thinning process of vertical soap film before the film rupture is presented -- The interferometric arrangement consists in a double aperture pupil optical system which ...
  • Soap film analysis by speckle interferometer 

    Tebaldi, Myrian; Ángel-Toro, Luciano; Trivi, Marcelo; Bolognini, Néstor (SPIE, 2003-11-18)
    In this paper a soap film is characterized by using a speckle interferometer. The arrangement consists of a double-exposure specklegram obtained through a double-aperture system, by introducing a wedge in front of one ...
  • Improvement of performance in FFH-OCDMA systems by using strong apodized fiber Bragg gratings 

    Marulanda, JI; Torres, PI; Ramirez, CA (SPIE-INT SOC OPTICAL ENGINEERING, 2004-01-01)
    This paper shows simulations of an all-fiber fast optical code division multiple access communications system (OCDMA), using strong apodized fiber Bragg gratings (FBGs) arrays as passive encoding-decoding devices. Auto and ...
  • DC term filtering techniques in digital holography 

    Garcia-Sucerquia, J.; Ramirez, J.A.H.; Prieto, D.V. (SPIE-INT SOC OPTICAL ENGINEERING, 2004-01-01)
    In numerical hologram reconstruction like in optical holography, there exist different diffraction orders, which many times produce difficulties for the image visualizations. In numerical reconstruction, the filtering of ...
  • Analysis of vibrations in a plate using interferometric methods 

    Rueda, E.; Angel, L.; Velasquez, D. (SPIE-INT SOC OPTICAL ENGINEERING, 2004-01-01)
    In this work some frequencies and modes of vibration of a thin plate were determined using interferometric methods like: real-time holographic interferometry, time-average holographic interferometry, digital speckle pattern ...
  • Reduction of speckle noise in digital holography 

    Garcia-Sucerquia, J.; Ramirez, J.A.H.; Castaneda, R.; Prieto, D.V. (SPIE-INT SOC OPTICAL ENGINEERING, 2004-01-01)
    A fundamental problem in holography, as well optical as digital, is the presence of speckle noise in the reconstruction process. Many approaches have been carried out in order overcome such a problem, ranging from altering ...
  • Speckle interferometric technique to assess soap films 

    Tebaldi, M; Angel, L; Bolognini, N; Trivi, M (ELSEVIER SCIENCE BV, 2004-01-02)
    An speckle interferometric technique to monitor the thinning process of vertical soap film before the film rupture is presented. The interferometric arrangement consists in a double aperture pupil optical system which ...
  • EMIR optomechanics 

    Barrera, Sonia; Villegas, Alejandro; Fuentes, Javier; Correa, Santiago; Pérez, Jaime; Redondo, Pablo; R. Restrepo; Sánchez, Vicente; Tenegi, Fabio; Garzón, Francisco; Patrón, Jesus (SPIE-INT SOC OPTICAL ENGINEERING, 2004-09-01)
    EMIR is a NIR multiobject spectrograph with imaging capabilities to be used at the GTC. A general description of instrument performances, as well as the updated optical and mechanical layouts, can be found elsewhere on ...
  • EMIR mechanical design status 

    Fuentes, F. J; Sánchez, Vicente; Barrera, Sonia; Correa, Santiago; Pérez, Jaime; Redondo, Pablo; R. Restrepo; Tenegi, Fabio; Villegas, Alejandro; Patrón, Jesus; Garzón, Francisco (SPIE-INT SOC OPTICAL ENGINEERING, 2004-09-01)
    EMIR is the NIR multi-object imager and spectrograph for the GTC (Gran Telescopio Canarias). The instrument PDR phase was held successfully in March 2003, and we are at present in the middle of the ADR (Advanced Design ...
  • EMIR: the GTC NIR multi-object imager spectrograph 

    Garzón, Francisco; Abreu, David; Barrera, Sonia; Correa, Santiago; Díaz, Jose; Fragoso, Ana; Fuentes, F.J; Gago, Fernando; Gonzalez, Carlos; López, Pablo; Manescau, Antonio; Patrón, Jesus; Pérez, Jaime; Redondo, Pablo; R. Restrepo; Sánchez, Vicente; Villegas, Alejandro (SPIE-INT SOC OPTICAL ENGINEERING, 2004-09-01)
    We present the final global design and performances of EMIR, the NIR multi-object spectrograph of the GTC, as well as the plan for its early scientific exploitation.
  • Structural and thermal analysis of EMIR 

    Correa, Santiago; R. Restrepo; Tenegi, Fabio; Fuentes, F.J; Sanchez, Vicente; Barrera, Sonia; Pérez, Jaime; Redondo, Pablo; Villegas, Alejandro; Garzón, Francisco; Patrón, Jesus (SPIE-INT SOC OPTICAL ENGINEERING, 2004-09-30)
    This paper shows the different design concepts and techniques employed in the structural and thermal analysis of EMIR (Espectrografo Multiobjeto Infrarrojo), nowadays under development at the Instituto de Astrofisica de Canarias.
  • Analysis of vibrations in a plate using interferometric methods 

    Ángel-Toro, Luciano; Prieto, Daniel Velasquez; Rueda Muñóz, Edgar Alberto (SPIE, 2004-10-21)
    In this work some frequencies and modes of vibration of a thin plate were determined using interferometric methods like: real-time holographic interferometry, time-average holographic interferometry, digital speckle pattern ...
  • Reduction of speckle noise in digital holography 

    Velásquez-Prieto, Daniel; García Sucerquia, Jorge Iván; Castañeda Sepúlveda, Román; Herrera Ramírez, Jorge Alexis (SPIE, 2004-10-21)
    A fundamental problem in holography, as well optical as digital, is the presence of speckle noise in the reconstruction process -- Many approaches have been carried out in order overcome such a problem, ranging from altering ...
  • DC term filtering techniques in digital holography 

    Velásquez-Prieto, Daniel; García Sucerquia, Jorge Iván; Herrera Ramírez, Jorge Alexis (SPIE, 2004-10-21)
    In numerical hologram reconstruction like in optical holography, there exist different diffraction orders, which many times produce difficulties for the image visualizations. In numerical reconstruction, the filtering of ...
  • Improvement of the signal-to-noise ratio in digital holography 

    Garcia-Sucerquia, J.; Ramírez, J.H.; Prieto, D.V. (Sociedad Mexicana de Fisica, 2005-01-01)
    A fundamental problem in optical and digital holography is the presence of speckle noise in the reconstruction process, which essentially diminishes the signal to noise ratio (SNR). For many applications, that reduction ...
  • Reduction of speckle noise in digital holography by using digital image processing 

    Garcia-Sucerquia, J; Ramirez, JAH; Prieto, DV (ELSEVIER GMBH, URBAN & FISCHER VERLAG, 2005-01-01)
    A fundamental problem in optical and digital holography is the presence of speckle noise in the reconstruction process. Many approaches have been carried out in order to overcome such a problem ranging from modifying the ...
  • Improvement of the signal-to-noise ratio in digital holography 

    Velásquez-Prieto, Daniel; Herrera Ramírez, Jorge Alexis; García Sucerquia, Jorge Iván; Velásquez-Prieto, Daniel; Herrera Ramírez, Jorge Alexis; García Sucerquia, Jorge Iván (Sociedad Mexicana de Física; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2005-02)
    A fundamental problem in optical and digital holography is the presence of speckle noise in the reconstruction process, which essentially diminishes the signal to noise ratio (SNR). For many applications, that reduction ...