Spiderweb Masks for High-Contrast Imaging
Spiderweb Masks for High-Contrast Imaging
复制标题
用于高对比度成像的蜘蛛网掩模
DOI：
10.1086/374971
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
N. Kasdin
中科院分区：
文献类型：
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作者：
R. Vanderbei;D. Spergel;N. Kasdin
出于对太阳系外行星成像的愿望，我们和其他人最近的工作表明，使用特殊形状的瞳孔掩模可以实现高对比度成像。迄今为止，我们设计的掩模相对于笛卡尔坐标系是对称的，但不是旋转不变的，因此需要以围绕中心点的不同旋转角度拍摄多个图像，以便在所有方向上获得高对比度。在本文中，我们提出了一类新的面具，具有旋转对称性，并提供高对比度，在所有方向上只有一个图像。这些掩模在中心点的4λ/D（在某些情况下为3λ/D）范围内提供所需的10-10级对比度，这被认为是太阳系外行星寻找/成像所必需的。它们也非常适合在地面望远镜上使用，也许詹姆斯韦伯太空望远镜也是如此，因为它们可以容纳中心障碍物和相关的支撑蜘蛛。
Motivated by the desire to image exosolar planets, recent work by us and others has shown that high-contrast imaging can be achieved using specially shaped pupil masks. To date, the masks we have designed have been symmetric with respect to a Cartesian coordinate system but were not rotationally invariant, thus requiring that one take multiple images at different angles of rotation about the central point in order to obtain high contrast in all directions. In this paper we present a new class of masks that have rotational symmetry and provide high contrast in all directions with just one image. These masks provide the required 10-10 level of contrast to within 4λ/D, and in some cases 3λ/D, of the central point, which is deemed necessary for exosolar planet finding/imaging. They are also well suited for use on ground-based telescopes, and perhaps the James Webb Space Telescope too, since they can accommodate central obstructions and associated support spiders.