Verroi Enrico, Frassetto Fabio, Naletto Giampiero
Department of Information Engineering, University of Padova, Via Gradenigo, 6/B-I-35131 Padova, Italy.
J Opt Soc Am A Opt Image Sci Vis. 2008 Jan;25(1):182-9. doi: 10.1364/josaa.25.000182.
A technique is described for the calculation of the intensity of the light diffracted by the occulter of an externally occulted solar coronagraph. This technique can be applied to an occulter of generic shape, but the attention is here focused on a specific application; that is, the case of a giant space solar coronagraph, in which the occulter is located at 100 m from the telescope aperture. By means of the code developed, it has been possible to simulate the effects of various shapes of the occulter edge with the aim of analyzing in detail the best apodization for the coronagraph. The results obtained show that an occulter with a circular serrated edge allows a remarkable reduction of the amount of diffracted light on the coronagraph's entrance aperture with respect to a simpler circular disk case.
本文描述了一种用于计算外部掩星式太阳日冕仪中掩星所衍射光强度的技术。该技术可应用于任意形状的掩星，但本文重点关注一种特定应用；即巨型空间太阳日冕仪的情况，其中掩星位于距望远镜孔径100米处。通过所开发的代码，能够模拟掩星边缘各种形状的效果，以便详细分析日冕仪的最佳变迹处理。所得结果表明，相对于简单的圆盘情况，具有圆形锯齿边缘的掩星可显著减少日冕仪入口孔径上的衍射光量。
