A coronagraph system with unbalanced nulling interferometer : progress of optics and control method
A coronagraph system with unbalanced nulling interferometer : progress of optics and control method
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带有不平衡归零干涉仪的日冕仪系统：光学和控制方法的进展
DOI：
10.1117/12.2055636
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Takashi
中科院分区：
文献类型：
--
作者：
Nishikawa;Jun;Oya;Masahito;Horie;Masaaki;Sato;Kazuma;Fukase;Masao;Murakami;Naoshi;Kotani;Takayuki;Kumagai;Shiomi;Tamura;Motohide;Tanaka;Yosuke;Kurokawa;Takashi
我们研究了一个带有非平衡零位干涉仪（UNI）的日冕仪系统。一个重要的特征是在UNI阶段将星星光预减少到1/100，这使得能够增强最终的对比度。从另一个角度来看，UNI平台放大了波前像差，这导致我们补偿超出AO系统能力的波前像差。它由UNI、自适应光学和日冕仪组成。在我们的实验中，我们已经观察到的额外的散斑减少优于0.07的UNI系统的优势。为了获得更好的对比度，我们计划重建所有的光学系统，其中使用UNI与4 QPM，冠状动脉与8 OPM或VVM，双反馈控制方法，和波前校正内UNI的上游AO。
We have studied a coronagraph system with an unbalanced nulling interferometer (UNI). An important characteristic is a pre-reduction of the star light to 1/100 at the UNI stage which enables to enhance the final contrast. In other point of view, the UNI stage magnifies the wavefront aberrations, which lead us to compensate for the wavefront aberrations beyond the AO systems capabilities. It consists of the UNI, adaptive optics, and a coronagraph. In our experiments, we have observed the extra speckle reduction of better than 0.07 by the advantage of the UNI system. In order to obtain better contrast, we planned to reconstruct all of the optics, which use UNI with 4QPM, a coronagraph with 8OPM or VVM, a dual feedback control method, and a wavefront correction inside the UNI by an upstream AO.