Abstract: A collimator was required to qualify the Advanced Land Imager (ALI) instrument of the EO-1 new millennium satellite for focus, MTF measurements, and distortion. It was used during assembly of the instrument and during thermal cycling while the instrument was in a vacuum tank. It had to be diffraction-limited over a 3 $MUL 3 degree field of view and over a waveband of 400 to 2500 nm, have no obstruction, and have a virtual exit pupil that could be imaged onto the entrance pupil of the telescope. To satisfy these requirements the collimator, external to the vacuum tank, was built comprising a spherical mirror with exit pupil at its center of curvature, a full-aperture beamsplitter in collimated space, and a single lens to flatten the field. The optical layout and method of verifying collimation will be presented as well as optical performance, of interest since no corrector plate could be used as in the usual Schmidt camera configuration. !0
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机译：摘要：需要使用准直仪来对EO-1新千年卫星的Advanced Land Imager（ALI）仪器进行聚焦，MTF测量和失真验证。它在仪器组装过程中以及在仪器处于真空罐中的热循环过程中使用。它必须在3 $ MUL 3度的视野和400至2500 nm的波段上受到衍射限制，没有障碍，并且具有可以成像到望远镜的入射光瞳上的虚拟出射光瞳。为了满足这些要求，在真空箱外部建立了一个准直仪，它包括一个球面镜，在其曲率中心处有出射光瞳，在准直空间中有一个全孔径分束器，以及一个用于平整视场的单透镜。由于没有像通常的施密特相机配置那样可以使用校正板，因此将介绍光学布局和验证准直的方法以及光学性能。 ！0
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