南极红外巡天望远镜红外背景辐射抑制方法

发布时间：2018-08-14 18:38

【摘要】：南极Dome A被认为是地球上最为优秀的天文测光、观测台址,尤其在红外波段。为了充分利用Dome A的独特天文观测优势条件以及满足系外行星观测需求和为我国未来南极更大口径望远镜的研制提供经验,提出建造1m可见/红外巡天望远镜。通过掩星法探测系外行星,至少需要万分之五的测光精度,必须很好地抑制或降低系统光机结构的自身辐射。以南极1m可见/红外巡天望远镜为例,进行南极红外望远镜杂散光抑制方法方面的探讨。由于该望远镜采用一次直接成像光学系统,光学结构简单,但无法设置冷光阑,红外背景辐射抑制效率较低。在光学系统设计上把次镜设置为孔径光阑进行优化设计,再详细介绍主镜遮光罩,次镜遮光罩,以及杜瓦瓶内冷光栏的独特设计,通过模拟仿真,自身辐射在像面上的辐照度为6.8×10-10 W/m2,为天空背景辐射在像面上的照度五分之一以下,满足天文观测三分之一要求。
[Abstract]:Antarctic Dome A is considered to be the best astronomical photometry and observational site on Earth, especially in the infrared band. In order to make full use of the unique astronomical observation advantage of Dome A, to meet the need of exoplanet observation and to provide experience for the future development of the larger Antarctic telescope in China, a 1m visible / infrared survey telescope is proposed. To detect exoplanets by occultation, at least 5/10000 photometric accuracy is required, so it is necessary to restrain or reduce the self-radiation of the optical structure of the system. Taking the Antarctic 1m visible / infrared sky survey telescope as an example, the method of suppressing stray light of the Antarctic infrared telescope is discussed. Because the telescope uses a primary direct imaging optical system, the optical structure is simple, but the cold aperture can not be set, so the infrared background radiation suppression efficiency is low. In the design of optical system, the secondary mirror is set as the aperture to optimize the design, and then the primary mirror shade, the secondary mirror shade and the unique design of the cool light bar in the Dewar bottle are introduced in detail. The irradiance of self radiation on the image plane is 6.8 脳 10 ~ (-10) W / m ~ (2), which is below 1/5 for the sky background radiation on the image surface, which meets the requirement of astronomical observation 1/3.
【作者单位】：中国科学院国家天文台南京天文光学技术研究所;中国科学院天文光学技术重点实验室;中国科学院大学;
【基金】：国家973计划(2013CB834901) 国家自然科学基金(11190011) 中国科学院天文光学技术重点实验室开放课题基金(K01)
【分类号】：TH751

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