Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1130...29p&link_type=abstract
IN: New technologies for astronomy; Proceedings of the Meeting, Paris, France, Apr. 25, 26, 1989 (A90-37976 16-89). Bellingham,
Astronomy and Astrophysics
Astronomy
Angular Resolution, Atmospheric Turbulence, Image Processing, Telescopes, Wave Front Deformation, High Resolution, Signal To Noise Ratios, Speckle Interferometry
Scientific paper
In the present high-resolution technique, which yields higher S/N than speckle interferometry, data obtained at both the focal and aperture planes are simultaneously processed. A wavefront sensor is conjugated with the aperture in order to determine the wavefront simultaneously with the image. This makes it possible to calculate the instantaneous optical transfer function, including its atmospheric component. Spatial frequencies which have not yet been eliminated from the image can then be corrected. Since lost spatial frequencies are different for each recorded image due to the random temporal evolution of the turbulence, the entire object frequency spectrum can be restored from a sufficiently large set of short-exposure images and associated wavefronts.
Fontanella Jean-Claude
Marais T.
Primot Jerome
Rousset Gabriel
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