Artículos y presentaciones en Congresos
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Examinando Artículos y presentaciones en Congresos por Autor "Angel, Luciano"
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Acceso Abierto Phase-object analysis with a speckle interferometer(2002) Angel, Luciano; Tebaldi, Myrian C.; Trivi, Marcelo Ricardo; Bolognini, NéstorWe describe the characteristics of a double-exposure specklegram obtained through a double-aperture system, by introduction of a wedge in front of one aperture in one exposure. It is assumed that a uniform displacement of the diffuser is produced between exposures. The average intensity distribution and visibility of the interferometric fringes in the Fourier plane are analyzed. An alternative interferometric technique for phase-object detection is proposed. - Artículo
Acceso Abierto Speckle photography with different pupils in a multiple-exposure scheme(2000) Angel, Luciano; Tebaldi, Myrian C.; Bolognini, Néstor; Trivi, Marcelo RicardoThe use of different multiple aperture pupils for recording each image in speckle photography is proposed. The introduction of suitable spatial frequency carriers, by internally modulating imaged speckles, allows one to selectively isolate or combine the spectral content of different images into spatially separated regions in the Fourier plane. Theoretical and experimental results extend the speckle photography technique to the depic tion of several specklegrams of multiple uniform in plane displacements. In this case, because different pu pils are considered for recording, the cross correlation functions for the amplitudes and intensities in the image plane are calculated on the basis of the statistical properties of the object. Also, the ensemble average inten sity in the Fourier plane is analytically derived, and fringe visibility is investigated.