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Grazing-incidence telescope-spectrograph for space solar-imaging spectroscopy

机译：空间太阳成像光谱的掠入射望远镜光谱仪

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摘要

The design of a stigmatic grazing-incidence instrument for space applications to solar-imaging spectros-copy is presented. It consists of a double telescope and a spectrograph: Telescope I consists of a single cylindrical mirror with parabolic section, focusing the radiation on the entrance slit of the spectrograph in the spectral dispersion plane; telescope II consists of two cylindrical mirrors with aspherical section in a Wolter configuration, focusing the radiation on the spectrograph focal plane in the direction perpendicular to the spectral dispersion plane. The spectrograph consists of a grazing-incidence spherical variable-line-spaced grating with flat-field properties. Telescope II is crossed with respect to the grating and telescope I;i.e., it is mounted with its tangential planes coincident with the grating equatorial plane. The spectrum is acquired by a detector mounted at near-normal incidence with respect to the direction of the exit beam. The spectral resolution is also preserved for off-axis angles. The effective collecting area of the instrument can be preserved by adoption of a nested configuration for telescope II without degradation of the spectral resolution.
机译：提出了一种用于空间成像和太阳成像光谱学的散光掠入射仪器的设计。它由一个双筒望远镜和一个光谱仪组成：望远镜I由一个具有抛物线形截面的圆柱镜构成，它将辐射聚焦在光谱色散平面中光谱仪的入口狭缝上。望远镜II由两个非球面的圆柱镜组成，呈Wolter形状，将辐射沿垂直于光谱色散平面的方向聚焦在光谱仪的焦平面上。光谱仪由具有平场特性的掠入射球形可变线距光栅组成。望远镜II相对于光栅和望远镜I交叉;即安装时，其切线平面与光栅赤道平面重合。光谱是由安装在相对于出射光束方向接近法线入射的检测器获取的。对于离轴角也保留光谱分辨率。可以通过采用望远镜II的嵌套配置来保留仪器的有效收集区域，而不会降低光谱分辨率。

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