Physics – Optics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jopt...16..257f&link_type=abstract
(Journal of Optics, vol. 16, no. 6, 1985, p. 257-268) ONERA, TP, no. 1986-48, 1986, 13 p. In French. DRET-supported research.
Physics
Optics
12
Adaptive Optics, Atmospheric Optics, Atmospheric Turbulence, Telescopes, Wave Fronts, Image Processing, Lenses, Optical Transfer Function, Wave Front Reconstruction
Scientific paper
For large telescopes, the fundamental limit set by the diffraction to the angular resolution can be reached if the aberrations are perfectly corrected. Two solutions are practicable: image restoration by numerical processing or real time correction by adaptive optics. These two processes require the determination of the wavefront or of the optical transfer function. New large detector arrays can be used in wavefront sensing and then allow the measurement of the wavefront in a great number of points. The general lay-out of such an instrument is given and its accuracy evaluated. The wavefront sensing contribution to numerical image processing is studied mainly in case of degradation by atmospheric turbulence. The improvement of numerical processing by a partially active correction is discussed.
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