论文标题
分段后视镜的偏光表征
Polarimetric characterization of segmented mirrors
论文作者
论文摘要
我们研究了光轴周围轴向对称性的损失对望远镜的极化特性，当每个片段都存在于不同的老化阶段时，望远镜的望远镜具有分段的主反射镜。在时间中取代的每个节段的不同氧化阶段导致不可忽略的串扰项。该作用取决于波长，主要取决于反射材料的性质。对于铝涂层，发现可见的蓝色部分是由于氧化而导致的最差偏振行为。相反，正如这项工作中的建模一样，灰尘并不能显着改变光学系统的极化行为。根据望远镜的不同，可能会有细分替代序列强烈削弱这种仪器极化。
We study the impact of the loss of axial symmetry around the optical axis on the polarimetric properties of a telescope with segmented primary mirror when each segment is present in a different aging stage. The different oxidation stage of each segment as they are substituted in time leads to non-negligible crosstalk terms. This effect is wavelength dependent and it is mainly determined by the properties of the reflecting material. For an aluminum coating, the worst polarimetric behavior due to oxidation is found for the blue part of the visible. Contrarily, dust -- as modeled in this work -- does not significantly change the polarimetric behavior of the optical system . Depending on the telescope, there might be segment substitution sequences that strongly attenuate this instrumental polarization.
