地基日冕仪杂散光抑制的关键技术研究

发布时间：2018-01-20 00:12

本文关键词： 内掩式透射地基日冕仪杂散光结构性遮拦二次成像　出处：《中国科学院研究生院（长春光学精密机械与物理研究所）》2012年硕士论文　论文类型：学位论文

【摘要】：为了实现在地面上对太阳日冕的连续观测,地基日冕仪的出现满足了人类的这种需求。地基日冕仪是人为通过仪器的结构遮拦造成类似日全食影像的成像仪器。本文设计的内掩式透射地基日冕仪视场为±1.1-3R(?),约为±48’,系统工作波段为530-555nm,口径120mm,系统F数为8.2,系统总长1800mm,其中光学系统长1700mm,焦距为987mm,分辨率为2.8"/pixel,分辨线宽13.5μm。日冕仪观测的目标为日冕,日冕的亮度对主要来自太阳光球层的可见光而言极其微弱,所以地基日冕仪光学系统的关键就是消除来自外界及自身杂散光的影响。日冕仪对杂散光有非常高的抑制要求。为了提高日冕仪的杂散光抑制水平及成像质量,本文分析了地基日冕仪的光学设计结构及三类主要的杂光,分别为太阳直射光、入射口径光阑的边缘衍射光、物镜组内表面多次反射光及光学材料的内部杂质和折射率不均匀性引入的杂散光。运用二次成像理论及光阑的共轭关系,并结合超光滑加工实现对以上主要杂散光的高效能抑制。基于日冕仪杂散光的成像及遮拦理论,并结合超净间中的模拟成像实验对主要的杂散光抑制部件进行定量分析。实验与理论结果很好的吻合,当三类主要杂散光都得到抑制后,实验能够实现了对10-6量级日冕目标的观测,说明了日冕仪系统光学结构设计的可行性及结构遮拦的有效性,满足了日冕仪的设计要求。
[Abstract]:In order to realize the continuous observation of the solar corona on the ground. The appearance of the ground-based coronometers satisfies the needs of human beings. The ground-based coronometers are an imaging instrument which creates a similar image of the total solar eclipse by means of the structure of the apparatus. The field of view of the ground-based coronometers designed in this paper is 卤. 1.1-3R (. ? The operating band of the system is 530-555nm, the aperture is 120mm, the F number of the system is 8.2, the total length of the system is 1800mm, and the optical system length is 1700mm. The focal length is 987 mm, the resolution is 2.8 "pixel, the resolution is 13.5 渭 m. The corona is the object of the corona, and the brightness of the corona is extremely weak for the visible light, which comes mainly from the solar photosphere. Therefore, the key of the optical system of the ground-based coronometers is to eliminate the influence of the stray light from the outside world and their own. The coronal apparatus has a very high demand for the suppression of stray light. In order to improve the level of stray light suppression and the imaging quality of the coronal instrument. In this paper, the optical design structure of the ground-based coronometers and three main types of stray light are analyzed, which are the direct solar light and the edge diffracted light of the incident aperture aperture. Multiple reflections from the internal surface of the objective group and stray light from the internal impurity and refractive index inhomogeneity of the optical material. The theory of secondary imaging and the conjugate relation of the aperture are used. Combined with ultra-smooth processing, the high performance suppression of the main stray light above can be realized. Based on the imaging and blocking theory of coronal stray light, and combined with the simulation imaging experiment in super-clean space, the main stray light suppression components are quantitatively analyzed. The experimental results are in good agreement with the theoretical results. When the three kinds of main stray light are suppressed, the experimental results show the feasibility of the optical structure design of the coronal instrument system and the effectiveness of the structure blocking. The design requirements of coronal apparatus are satisfied.
【学位授予单位】：中国科学院研究生院（长春光学精密机械与物理研究所）
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH753.12

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