Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2263..394w&link_type=abstract
Proc. SPIE Vol. 2263, p. 394-397, Current Developments in Optical Design and Optical Engineering IV, Robert E. Fischer; Warren J
Astronomy and Astrophysics
Astronomy
Scientific paper
With large-ground based telescopes it is not possible to achieve the theoretical diffraction- limited spatial resolution. The reason is the turbulent earth atmosphere which disturbs the light wavefronts coming from the observed astronomical objects. Due to this influence, short exposures consist of bright and dark interference patterns, and they are therefore called speckle interferograms. With correlation techniques the diffraction-limited information about the observed object can be deconvolved from a set of such speckle interferograms. The investigation of the detector accuracy, which is required for a successful working of the correlation methods, manifests this simple fact: one bit of dynamic range is enough to feasibly detect astronomical speckle interferograms for the high-resolution methods. The method of correlating interferometric data having only a dynamic range of one bit is seen to be useful for astronomical high-resolution imaging at optical wavelengths. The new detector principle was first investigated in detail in computer simulations. It is now motivated additionally by laboratory simulations which should give a more realistic view of true astronomical observations, because in them nearly all technical problems should be considered sufficiently.
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