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Logic operations by using modulated speckle
(SPIE, 2001-08-14)
An alternative image multiplexing technique is proposed. In the arrangement implemented, the input is imaged by introducing a multiple aperture pupil in the imaging lens. Then, the speckle pattern is modulated by several ...
Analysis of vibrations in a plate using interferometric methods
(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 ...
DC term filtering techniques in digital holography
(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 ...
Reduction of speckle noise in digital holography
(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 ...
Phase-difference images by digital holography applied to 3D surface contouring
(Academia Colombiana de Ciencias Exactas Físicas y Naturales, 2005-06)
The problem to determine the 3D-contour of objects with all sizes and shapes is a hot topic in diverse fields of optical research and engineering. Through the use of the numerical reconstruction of digital recorded holograms, ...
Soap film analysis by speckle interferometer
(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 ...
Double exposure specklegrams obtained by using scaled aperture pupils
(SPIE, 2001-08-14)
In speckle photography the pupil aperture is usually not modified between exposures. In our work, the change of the pupil aperture scale between exposures is analyzed on the basis of double-exposed image speckle, before ...
EMIR: The GTC NIR multi-object imager-spectrograph
(SPIE-INT SOC OPTICAL ENGINEERING, 2006-01-01)
EMIR, currently entering into its fabrication and AIV phase, will be one of the first common user instruments for the GTC, the 10 meter telescope under construction by GRANTECAN at the Roque de los Muchachos Observatory ...
Status of the EMIR mechanical system
(SPIE-INT SOC OPTICAL ENGINEERING, 2006-06-28)
EMIR is the NIR multi-object imager and spectrograph for the GTC (Gran Telescopic Canarias). The instrument ADR (Advanced Design Review) was held successfully in March 2006. During the AD phase, a number of mechanical ...
Inspection of an extended surface by an active 3D multiresolution technique
(Springer-Verlag Berlin Heidelberg, 2009-01-01)
Reliable inspection of large surfaces with low depth recovery error is needed in a wide variety of industrial applications, for example in deformation measurement or defect inspection of extended surfaces as communication ...
