红外倾翻感测:空中经验、教训和未解决的问题
Infrared tip-tilt sensing: on-sky experience, lessons learned and unsolved problems
摘要:
在三种不同的激光导星自适应光学(AO)系统上,利用三种不同的望远镜分别安装了红外倾斜敏感器(ITTS)。这些红外TTS受益于高阶环路PSF锐化在近红外,因此,他们提供了一个低的倾斜残留和良好的天空覆盖。然而,这些IR TTS具有挑战性,并且它们在AO中的使用是有限的。在本文中,我们概述了现有的红外TTS,提供对天空的性能结果,并描述了我们的经验,使用红外TTS,以及在不久的将来的计划。本文的第二部分讨论了IR文语转换系统面临的挑战。这些包括算法和环路稳定性在低斯特列尔制度,使用红外TTS测量高阶模式和指导多个指南星与不同的幅度。
英文摘要:
Infrared tip-tilt sensors (IR TTSs) have been deployed on three different laser guide star adaptive optics (AO) systems on three different telescopes. These IR TTS benefit from the high-order loop PSF sharpening in the near infrared, hence they provide a low tip-tilt residual and a good sky coverage. Nevertheless, these IR TTS are challenging and their use in AO is limited. In this paper, we outline existing IR TTS, provide on-sky performance results and describe our experience using IR TTS and along with plans for the near future. The second part of the paper deals with unresolved challenges for IR TTS. These include algorithms and loop stability in the low Strehl regime, using IR TTSs to measure higher-order modes and guiding on multiple guide stars with different magnitudes.
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