Image selection by using an on-line fast shutter driven by tip-tilt signal

Carlo Morossi; Mariagrazia Franchini; Sergio Furlani; Roberto Ragazzoni; Enrico Marchetti

doi:10.1117/12.268970

21 March 1997 Image selection by using an on-line fast shutter driven by tip-tilt signal

Carlo Morossi, Mariagrazia Franchini, Sergio Furlani, Roberto Ragazzoni, Enrico Marchetti

Proceedings Volume 2871, Optical Telescopes of Today and Tomorrow; (1997) https://doi.org/10.1117/12.268970
Event: Optical Telescopes of Today and Tomorrow, 1996, Landskrona/Hven, Sweden

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 (r_o) is analyzed. The pros and cons of a ferroelectric liquid crystal shutter are discussed.

Citation Download Citation

Carlo Morossi, Mariagrazia Franchini, Sergio Furlani, Roberto Ragazzoni, and Enrico Marchetti "Image selection by using an on-line fast shutter driven by tip-tilt signal", Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997); https://doi.org/10.1117/12.268970

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