Aperture synthesis imaging through turbulence with the aid of lucky imaging

Details Aperture synthesis imaging through turbulence with the aid of lucky imaging Aperture synthesis imaging through turbulence with the aid of lucky imaging

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7072e..16w&link_type=abstract

Optics and Photonics for Information Processing II. Edited by Awwal, Abdul Ahad Sami; Iftekharuddin, Khan M.; Javidi, Bahram. P

Physics

Optics

Scientific paper

Aperture synthesis allows a number of small apertures to operate cooperatively in the synthesis of a large full aperture telescope. For earth-based systems, the effects of atmospheric turbulence, which introduces time-varying aberrations, must somehow be corrected if good imagery is to be obtained. One correction scheme relies on a comparison, in a range of overlap, of correctly-phased spatial frequency components with new components that are in error by unknown piston (constant) and tip-tilt (linear) phase terms. Normally this method requires that the subapertures employed in the synthesis be sufficiently small that phase aberrations beyond piston and tip-tilt be ignorable. Through the exploitation of lucky imaging conditions, however, larger apertures can be used, with a subsequent increase in resolution and light-gathering power for the optical system.

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