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Space-qualified liquid-crystal variable retarders for wide-field-of-view coronagraphs
(SPIE-INT SOC OPTICAL ENGINEERING, 2011-01-01)
Liquid-crystal variable retarders (LCVRs) are an emergent technology for space-based polarimeters, following its success as polarization modulators in ground-based polarimeters and ellipsometers. Wide-field double nematic ...
Consumed fatigue life assessment of composite material structures by optical surface roughness inspection
(Trans Tech Publications Ltd., 2013-01-01)
A strong knowledge of the fatigue state of highly advanced carbon fiber reinforced polymer composite (CFRP) structures is essential to predict the residual life and optimize intervals of structural inspection, repairs, ...
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 ...
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 ...
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 ...
Improvement of performance in FFH-OCDMA systems by using strong apodized fiber Bragg gratings
(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
(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 ...
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 ...
HIPAE helicopter-borne in-situ pollution assessment experiment: Plataforma alternativa para la medición de contaminantes en capas verticales
(Institute of Electrical and Electronics Engineers Inc., 2019-01-01)
