17 October 1997 Online image selection for the Italian Telescopio Nazionale Galileo (TNG): numerical simulation and performance evaluation
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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.
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Carlo Morossi, Carlo Morossi, Mariagrazia Franchini, Mariagrazia Franchini, Sergio Furlani, Sergio Furlani, Giorgio Sedmak, Giorgio Sedmak, } "Online image selection for the Italian Telescopio Nazionale Galileo (TNG): numerical simulation and performance evaluation", Proc. SPIE 3126, Adaptive Optics and Applications, (17 October 1997); doi: 10.1117/12.290166; https://doi.org/10.1117/12.290166
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