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Proceedings Paper

Speckle statistics in adaptive optics images at visible wavelengths
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Paper Abstract

Residual speckles in adaptive optics (AO) images represent a well known limitation to the achievement of the contrast needed for faint stellar companions detection. Speckles in AO imagery can be the result of either residual atmospheric aberrations, not corrected by the AO, or slowly evolving aberrations induced by the optical system. In this work we take advantage of new high temporal cadence (1 ms) data acquired by the SHARK forerunner experiment at the Large Binocular Telescope (LBT), to characterize the AO residual speckles at visible waveleghts. By means of an automatic identification of speckles, we study the main statistical properties of AO residuals. In addition, we also study the memory of the process, and thus the clearance time of the atmospheric aberrations, by using information Theory. These information are useful for increasing the realism of numerical simulations aimed at assessing the instrumental performances, and for the application of post-processing techniques on AO imagery.

Paper Details

Date Published: 27 July 2016
PDF: 8 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99097P (27 July 2016); doi: 10.1117/12.2232377
Show Author Affiliations
Marco Stangalini, INAF-OAR National Institute for Astrophysics (Italy)
ADONI Adaptive Optics National Lab. of Italy (Italy)
Fernando Pedichini, INAF-OAR National Institute for Astrophysics (Italy)
ADONI Adaptive Optics National Lab. of Italy (Italy)
Filippo Ambrosino, INAF-OAR National Institute for Astrophysics (Italy)
Mauro Centrone, INAF-OAR National Institute for Astrophysics (Italy)
Dario Del Moro, Univ. of Rome Tor Vergata (Italy)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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