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Effect of the internal modulation of speckles in displacement measurements in optical vortex metrology
(SPIE, 2013-11-08)
The Optical Vortex Metrology is based on the possibility of characterizing, through topological and morphological parameters, each one of the vortices existing in the phase of the optical field, or in a pseudo-phase obtained ...
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 ...
Analysis of vibrations in a plate using interferometric methods
(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 ...
Features on photorefractive registered speckles
(SPIE, 1999-04-29)
The recording and read-out of a volume speckle pattern is investigated for transmission geometry. The modulation of the 3D speckle grains appears when the image of a coherently illuminated random diffusor is formed onto ...
Electronic speckle pattern interferometry technique for the measurement of complex mechanical structures for aero-spatial applications
(SPIE-INT SOC OPTICAL ENGINEERING, 2010-01-01)
Using the electronic speckle pattern interferometry (ESPI) technique in the in-plane arrangement, the coefficient of thermal expansion (CTE) of a composite material that will be used in a passive focusing mechanism of an ...
Effect of the internal modulation of speckles in displacement measurements in optical vortex metrology
(SPIE-INT SOC OPTICAL ENGINEERING, 2013-01-01)
The Optical Vortex Metrology is based on the possibility of characterizing, through topological and morphological parameters, each one of the vortices existing in the phase of the optical field, or in a pseudo-phase obtained ...
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 ...
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 ...
Soap film analysis by speckle interferometer
(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 ...
Reduction of speckle noise in digital holography
(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 ...
