| 关于摄谱仪中畸象系统的若干讨论 |
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| 引用本文： | 路声东,蒋世仰.关于摄谱仪中畸象系统的若干讨论[J].中国天文和天体物理学报,1988(2). |
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| 作者姓名： | 路声东 蒋世仰 |
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| 作者单位： | 中国科学院北京天文台
(路声东)，中国科学院北京天文台(蒋世仰) |
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| 摘 要： | 本文讨论了摄谱仪中若干畸象系统,它们的作用是缩放入射狭缝的象单在高或宽的方向的尺寸,这等效于在狭缝前、后单在子午面内或弧矢面(色散方向面)内改变光束的孔径角,也等效于准直光束单在子午面或弧矢面内缩放光束宽度,在讨论中指出了准直畸象系统优于非准直畸象系统。 在着重讨论和分析准直畸象系统的不同形式时,我们提出了棱镜系统,它具有许多优点,是最为可行的方案。
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| 关 键 词： | 仪器设备 摄谱仪 畸象光学 |
Some Discussions about Anamorphotic Optical Systems used in Astronomical Spectrograph |
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| Lu Shengdong Jiang Shiyang.Some Discussions about Anamorphotic Optical Systems used in Astronomical Spectrograph[J].Chinese Journal of Astronomy and Astrophysics,1988(2). |
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| Authors: | Lu Shengdong Jiang Shiyang |
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| Abstract: | Some anamorphotic optical systems used in astronomical spectrograph are discussed in this paper. The systems are used to take the anamorphotic slit image.In previous works (including the author's work), non-collimated anamorphotic systems were presented. Here, we present the collimated anamorphotic systems, especially, the prism system.Discussions suggest that the collimated anamorphotic systems are more advantageous than the non-collimated ones. And the prism system is the most attractive and feasible among all the mentioned anamorphotic systems (both collimated and non-collimated) because of its simple structure, easy manufacture, adjustment and alignment, and finally cheap cost.There are three forms of collimated anamorphotic systems:1. Reflecting form-off-axis cylindrical Mersenne system (Fig. 1);2. Refracting form (1)-cylindrical lens system (Fig. 2);3. Refracting form (2)-prism system (Fig. 3).In Wynne's non-collimated anamorphotic system, cylindrical lenses is inserted in front of spectrograph slit to reduce beam angle in sagittal plane, in order to reduce sagittal monochromatic apperture and solve the difficult problem encountered in design of the spectrograph camera with very large relative apperture. Jiang Shiyang first presents the concept of super-wide grating, and uses cylindrical lenses after the slit to vary beam angle in meridian plane. These lenses are combined to another anamorphotic system. The abovementioned systems can lie replaced by the prism anamorphotic system, which yields a simple solution. |
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| Keywords: | Instrumentation-spectrograph-anamorphotic optics |
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