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Parabola-doublet aplanat becomes anastigmatic when second doublet is inserted near focus

机译:当在焦点附近插入第二个双峰时,抛物线-双峰降平

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摘要

A doublet of choice glasses may be located in the converging focal cone of the infinity-focused parabola to yield an aplanatic telescope or camera. The resulting angular field is limited by high astigmatism but is significantly larger than that of the coma-limited parabola. The spherical and chromatic aberrations are so well corrected and the coma so well balanced that the doublet may be used unaltered with a parabola of arbitrary focal length and speed with excellent results for the unvignetted rays. A second doublet nearer to the focus and designed independently of the first corrects the system's astigmatism while preserving its aplanaticism. It may also be designed for flattening the field. This arrangement may allow for greater flexibility in the placing of optical elements than does Wynne's triplet for modest-aperture systems. Equations are presented for choosing candidate glasses for the first doublet from the very limited manifold of solving glasses.
机译:可以在无限聚焦的抛物线的会聚焦锥中放置双选眼镜,以产生非球面望远镜或照相机。所产生的角场受到高度散光的限制,但远大于昏迷受限抛物线的角场。球差和色差得到了很好的校正,彗形象差得到了很好的平衡,以至于双合透镜可以与任意焦距和速度的抛物线一起使用,并且对未渐晕的光线具有出色的效果。第二个双焦点靠近焦点并且独立于第一个而设计,可以校正系统的像散,同时保留其无规性。它也可能被设计用于平整场。这种布置可以为光学元件的放置提供比温尼光圈系统的Wynne三联体更大的灵活性。给出了用于从非常有限的求解眼镜流形中为第一对偶选择眼镜的方程式。

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  • 来源
    《Applied optics》 |2004年第22期|共6页
  • 作者

    Rick Blakley;

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  • 正文语种 eng
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