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Proceedings Paper

Image selection by using an on-line fast shutter driven by tip-tilt signal
Author(s): Carlo Morossi; Mariagrazia Franchini; Sergio Furlani; Roberto Ragazzoni; Enrico Marchetti
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Paper Abstract

The possibility of improving the image quality of the Italian Telescopio Nazionale Galileo (TNG) by means of real-time on- line image selection by using a fast shutter is studied. The tip-tilt signal is checked against a user defined threshold to trigger on rejection of those images which would significantly degrade the long-exposure point spread function because of jitter broadening. The dependency of the achievable improvements on the rejection threshold, on the shutter opening and closing times, and on the atmosphere conditions (ro) is analyzed. The pros and cons of a ferroelectric liquid crystal shutter are discussed.

Paper Details

Date Published: 21 March 1997
PDF: 8 pages
Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997); doi: 10.1117/12.268970
Show Author Affiliations
Carlo Morossi, Trieste Astronomical Observatory (Italy)
Mariagrazia Franchini, Trieste Astronomical Observatory (Italy)
Sergio Furlani, Trieste Astronomical Observatory (Italy)
Roberto Ragazzoni, Osservatorio Astronomico di Padova (Italy)
Enrico Marchetti, Ctr. for Studies and Space Activities (Italy)


Published in SPIE Proceedings Vol. 2871:
Optical Telescopes of Today and Tomorrow
Arne L. Ardeberg, Editor(s)

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