Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt.........8p&link_type=abstract
Ph.D. Thesis - Paris-Sud Univ., 1989 European Space Agency, Paris (France). Transl. into ENGLISH of Application des Techniques
Astronomy and Astrophysics
Astronomy
Angular Resolution, Atmospheric Turbulence, Image Analysis, Image Reconstruction, Optical Data Processing, Wave Fronts, Astronomy, High Resolution, Imaging Techniques, Optical Transfer Function, Signal To Noise Ratios, Speckle Interferometry, Telescopes
Scientific paper
The angular resolution of large terrestrial telescopes is essentially limited to approximately one arc second by atmospheric turbulence, regardless of the diameter of the entrance pupil. Various techniques for postprocessing images recorded at the output of the telescope have already been suggested so as to recover its theoretical resolving power. The originality of the method described here resides in the fact that data from the pupil and focal planes are processed simultaneously. To do this, a second wavefront sensing channel is placed in parallel with the conventional degraded image recording channel. It then permits continuous evaluation of the optical transfer function. From this information, the spatial frequencies of the object which were not totally masked by the turbulence can be corrected. The complete processsing of a set of (image, associated transfer function) pairs is described. The limits of the method are characterized and it was possible to carry out a laboratory experiment so as to prove its efficiency. The signal to noise ratio evaluated for this technique allowed it to be placed with respect to the techniques of speckly interferometry and interferometry in pupil plane for various luminance levels of the observed object.
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