Issues with external occultation of a coronagraph

Details Issues with external occultation of a coronagraph Issues with external occultation of a coronagraph

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011exa....29..145b&link_type=abstract

Experimental Astronomy, Volume 29, Issue 3, pp.145-153

Astronomy and Astrophysics

Astronomy

Solar Coronagraph, Coronagraph, Occultation, Vignetting, Zemax

Scientific paper

This paper addresses some of the issues related to externally occulted solar coronagraph; vignetting and achievable resolution due to an external occulter. The analytical expression by Evans (J Opt Soc Am 38:1083-1085, 1948) is used to perform the initial calculations. An expression for the vignetting for a given external occulter and field angle is derived. The values obtained with the derived expression are verified with those obtained by ZEMAX an Optical design software. The degradation in angular resolution of the system due to vignetting is also presented and an empirical relation to calculate the normalized resolution for a given amount of vignetting is obtained.

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