Issues with external occultation of a coronagraph

Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/5341

Title:	Issues with external occultation of a coronagraph
Authors:	Bayanna, A. R Mathew, S. K Sankarasubramanian, K Venkatakrishnan, P Singh, J Prasad, B. R
Keywords:	Solar coronagraph Coronagraph Occultation Vignetting ZEMAX
Issue Date:	Apr-2011
Publisher:	Springer
Citation:	Experimental Astronomy, Vol. 29, No. 3, pp. 145-153
Abstract:	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.
Description:	Restricted Access The original publication is available at springerlink.com
URI:	http://hdl.handle.net/2248/5341
Appears in Collections:	IIAP Publications

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