Free Access

Fig. 1


Imaging a single star through atmospheric turbulence: while the angular resolution of a long exposure image (top left) is limited by the strength of the atmospheric turbulence (commonly quantified by Fried’s parameter ro), a short exposure image (bottom left) encapsulates information up to the diffraction-limited upper frequency bound which is proportional to the diameter D of the telescope’s primary mirror. The right panel shows the radial averaged modular transfer function (MTF) for diffraction-limited, short and long exposure imaging. While the long exposure MTF falls to nearly zero at ro/λ, the average short exposure MTF reaches intermediate levels up to the diffraction limited upper frequency bound. The short exposure MTF was averaged over 5000 trials. The simulation was performed for D/ro = 13.3.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.