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Optical alignment of the Galileo telescope: results and on-sky test before active optics final tuning

机译：伽利略望远镜的光学对准：在主动光学最终调整之前的结果和空中测试

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Abstract: Optical alignment is a crucial step in the commitment of a telescope. The accuracy in which it is accomplished has a deep impact in the future life of the telescope. The Galileo Telescope, sited in La Palma, is a 3.58 meters telescope with active optics and has recently undergone its final optical alignment. The result of the alignment, obtained in the so-called 'passive' mode, that is just before switching- on the active optics system, are here presented. The alignment consisted in the definitions of the mechanical axes of the structure and mirrors supports and of the optical axis of the entire telescope, using three high precision alignment telescopes and their relative targets. The final step has been to take some images on the sky looking at point like objects and to measure the point spread function in terms of full width at half maximum. The first star imaged in our 'passive alignment' test on the sky had a FWHM of 0.8 arcsec, well inside the range of the active optics system correction, making it totally usable for the following fine-tuning of the optics. !1
机译：摘要：光学对准是望远镜开发中至关重要的一步。完成精度对望远镜的未来寿命有深远的影响。伽利略望远镜位于拉帕尔玛（La Palma），是一台具有主动光学功能的3.58米望远镜，最近已进行了最终的光学对准。这里介绍了在所谓的“被动”模式下获得的对准结果，即在接通主动光学系统之前。对准包括使用三个高精度对准望远镜及其相对目标来定义结构和反射镜支架的机械轴以及整个望远镜的光轴。最后一步是在天空中拍摄一些图像，以观察物体之类的点，并以半峰全宽来测量点扩展函数。在我们的“被动对准”测试中，成像的第一颗恒星的FWHM为0.8 arcsec，处于主动光学系统校正的范围之内，使其完全可用于随后的光学微调。 ！1

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