Sun Mingzhe, Zhang Hongxin, Bu Heyang, Wang Xiaoxun, Ma Junlin, Lu Zhenwu
J Opt Soc Am A Opt Image Sci Vis. 2013 Oct 1;30(10):2140-9. doi: 10.1364/JOSAA.30.002140.
To observe the solar corona, stray light in the coronagraph, arising primarily from an external occulter and diaphragm illuminated directly by the Sun, should be strongly suppressed. A toothed occulter and diaphragm can be used to suppress stray light because they diffract much less light in the central area than a circular disk. This study develops a method of computing the light diffracted by a toothed occulter and diaphragm, obtaining the optimum shape using this method. To prove the method's feasibility, the diffracted fields of circular and rectangular disks are computed and compared with those calculated by a conventional method.
为了观测日冕，日冕仪中的杂散光主要源于直接被太阳照亮的外部遮光板和光阑，应予以强烈抑制。齿形遮光板和光阑可用于抑制杂散光，因为它们在中心区域的光衍射比圆盘少得多。本研究开发了一种计算齿形遮光板和光阑衍射光的方法，并使用该方法获得最佳形状。为证明该方法的可行性，计算了圆形和矩形圆盘的衍射场，并与传统方法计算的结果进行了比较。
