Upgrading the Keck AO wavefront controllers
Upgrading the Keck AO wavefront controllers
复制标题
升级 Keck AO 波前控制器
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
D. Pescoller
中科院分区：
文献类型：
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作者：
E. Johansson;M. V. van Dam;P. Stomski;J. Bell;J. Chin;Roger C. Sumner;P. Wizinowich;R. Biasi;M. Andrighettoni;D. Pescoller
本文描述了W.M.Keck天文台自适应光学(AO)系统最近进行的升级，其中波前传感器和波前控制器被基于新技术的部件所取代。升级后的系统的性能提高了极限引导星等，激光引导星(LGS)和自然引导星(NGS)模式的Strehl比都增加了，而且与原系统相比，可靠性和可维护性有了显著提高。此外，控制器是可扩展的，允许根据需要进行未来的升级和改进。我们概述了该项目；描述了新的波前传感器和控制器的基本架构；讨论了系统的一些独特功能，包括闭环镜定位系统、定制的波前传感器光学系统和全帧速率遥测服务器；最后总结了新控制器在Keck II AO系统上的工程和科学测试结果。
This paper describes the recent upgrade performed on the W. M. Keck Observatory Adaptive Optics (AO) systems, in which the wavefront sensors and wavefront controllers were replaced with components based on new technology. The performance of the upgraded system has yielded an increase in limiting guide star magnitude, an increased Strehl ratio for both Laser Guide Star (LGS) and Natural Guide Star (NGS) modes, and has significantly improved reliability and maintainability compared to the original system. Moreover, the controller is scalable, allowing for future upgrades and improvements as needed. We present an overview of the project; describe the basic architecture of the new wavefront sensor and controller; discuss some of the unique features of the system, including the closed loop mirror positioning system, custom wavefront sensor optics, and full-frame-rate telemetry server; and conclude with results from engineering and science tests of the new controller on the Keck II AO system.