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Range-balancing the Large Binocular Telescope

机译：大型双筒望远镜的距离平衡

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The Large Binocular Telescope (LBT) consists of two 8.4 m telescopes mounted on a common alt-az gimbal. The telescope has various modes of operation, including prime-focus, bent- and direct-Gregorian modes. The telescopes can feed independent instruments or their light can be combined in one of two interferometric instruments, giving an interferometric baseline of over 22 m. With all large telescopes, including the LBT, collimation models or modeled values for hexapod positions, are required to maintain reasonable optical alignment over the working range of temperatures and telescope elevations. Unlike other telescopes, the LBT has a highly asymmetric mechanical structure, and as a result the collimation models are required to do a lot more "work", than on an equivalent aperture monocular telescope that are usually designed to incorporate a Serurrier truss arrangement. LBT has been phasing in science operations over the last 5 years, with first light on the prime-focus cameras in 2006, and first light in Gregorian mode in 2008. In this time the generation of collimation models for LBT has proven to be problematic, with large departures from a given model, and large changes in pointing, being the norm. A refined approach to generating collimation models, "range balancing", has greatly improved this situation. The range-balancing approach to generating collimation models has delivered reliable collimation and pointing in both prime focus and Gregorian modes which has led to greatly increased operational efficiency. The details of the range-balancing approach, involving the removal of pointing "contamination" from collimation data, are given in this paper.
机译：大型双筒望远镜（LBT）由两个8.4 m望远镜组成，它们安装在一个普通的alt角万向节上。望远镜具有多种操作模式，包括基本聚焦，弯曲和直接格里高利模式。望远镜可以馈送独立的仪器，或者它们的光可以组合在两个干涉仪中的一个中，从而提供超过22 m的干涉基线。对于包括LBT在内的所有大型望远镜，都需要准直模型或六脚架位置的建模值，以在温度和望远镜标高的工作范围内保持合理的光学对准。与其他望远镜不同，LBT具有高度不对称的机械结构，因此，与通常设计为包含Serurrier桁架装置的等效孔径单眼望远镜相比，准直模型需要做更多的“工作”。在过去的5年中，LBT一直在逐步进入科学运作阶段，2006年第一光束聚焦在定焦相机上，2008年第一光进入格里高利模式。在这个时候，LBT准直模型的产生被证明是有问题的，与给定模型大相径庭，指向也发生较大变化，这是常态。生成准直模型的改进方法“范围平衡”极大地改善了这种情况。生成准直模型的距离平衡方法在主要聚焦和格里高利模式下均提供了可靠的准直和指向，从而大大提高了运行效率。本文给出了距离平衡方法的详细信息，其中涉及从准直数据中删除指向的“污染”。

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