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Proceedings Paper

Online image selection for the Italian Telescopio Nazionale Galileo (TNG): numerical simulation and performance evaluation
Author(s): Carlo Morossi; Mariagrazia Franchini; Sergio Furlani; Giorgio Sedmak
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Paper Abstract

The possibility of improving the image quality of the Italian “Telescopio Nazionale Galileo (TNG)” by means of on-line image selection via a fast shutter is discussed. The different performances obtainable with different shutter speeds, selection rates and sharpness criteria are derived by the analysis of temporal series of simulated short exposure images of atmospheric speckles. The speckles are obtained by drifting large format phase screens of von Kármán statistics over the telescope pupil. The phase screens are generated by FFT transforming a white noise of controlled quality and by adding subharmonics to approximate the low frequency pattern. Particular attention is devoted to the identification of the most suitable merit function(s) for on-line image selection and to the comparison of the achievable image quality improvements with those obtainable through off-line selection and co-addition post-processing techniques.

Paper Details

Date Published: 17 October 1997
PDF: 7 pages
Proc. SPIE 3126, Adaptive Optics and Applications, (17 October 1997); doi: 10.1117/12.290166
Show Author Affiliations
Carlo Morossi, Osservatorio Astronomico di Trieste (Italy)
Mariagrazia Franchini, Osservatorio Astronomico di Trieste (Italy)
Sergio Furlani, Osservatorio Astronomico di Trieste (Italy)
Giorgio Sedmak, Univ. degli Studi di Trieste (Italy)


Published in SPIE Proceedings Vol. 3126:
Adaptive Optics and Applications
Robert K. Tyson; Robert Q. Fugate, Editor(s)

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