Physics – Optics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jopt...16...21h&link_type=abstract
Journal of Optics (ISSN 0150-536X), vol. 16, Jan.-Feb. 1985, p. 21-26. In French.
Physics
Optics
14
Angular Resolution, Astronomical Photography, Frame Photography, Imaging Techniques, Exposure, High Resolution, Solar Observatories, Space Observations (From Earth)
Scientific paper
Capturing short exposures of celestial objects with a ground-based telescope avoids the image blurring inherent in longer exposures due to atmospheric turbulence and rotation of the earth. Techniques for calculating the probability that any short exposure will have a phase shift of less than a square radian in a given percentage of the exposures are derived. It is shown that a selection of 10 percent of the images, recentered and added, can double the resolution if the ratio of the diameter of the main aperture/the Fried (1966) parameter for atmospheric turbulence is around 15 and also double for a selection of 1 percent of the exposures when the ratio is close to 20. Data from solar observations indicate that the resolution gains are only diffraction limited.
Coupinot Gerard
Hecquet Josette
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