How to monitor optimum exposure times for high resolution imaging modes?

Details How to monitor optimum exposure times for high resolution imaging modes? How to monitor optimum exposure times for high resolution imaging modes?

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..635l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 2, Jan. 1992, p. 635-640. Research supported by ESO.

Physics

Optics

10

Astrometry, Atmospheric Turbulence, Exposure, Image Resolution, Stellar Motions, Adaptive Optics, Angular Resolution

Scientific paper

A theory is developed showing that the volocity of the tilt for the angle of arrival of light at the ground level, or, equivalently, the observed image-motion velocity, is statistically related to turbulent atmosphere motions. It is shown that the method of differential image motion used for monitoring the 'Fried parameter' (Fried, 1975) can be extended to a new differential image-motion-velocity method. The method can be used as a diagnostic to estimate exposure times needed to freeze the drastic effect of the wavefront corrugation evolution in high-angular resolution imagery. This requires a growth of the sampling rate of ESO Differential Image Motion Monitor.

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