Laboratory testing and calibration of the upgraded MMT adaptive secondary mirror
Laboratory testing and calibration of the upgraded MMT adaptive secondary mirror
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升级版MMT自适应副镜的实验室测试和标定
DOI：
10.1117/12.2576352
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Gacon, Frank
中科院分区：
文献类型：
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作者：
Vaz, Amali;Morzinski, Katie M.;Montoya, Manny;Fellows, Chuck;Ford, John;Gardner, Andrew;Durney, Olivier;West, Grant;Harrison, Lori;Gacon, Frank
MMT自适应光学系外行星表征系统（MAPS）是对6.5米MMT天文台AO仪器的广泛检修和升级，从可变形次镜，通过可见光和近红外的金字塔波前传感器，到改进的科学相机。MAPS是一个由NSF MSIP资助的项目，其最终目标是为系外行星表征优化设施。在这里，我们描述了一个MAPS组件的实验室测试和校准：翻新的MMT自适应次镜（ASM）。新的ASM包括对电子设备和执行器的全面重新设计，包括简化的集线器级电子设备和集成到执行器本身的数字电子设备。重新设计将总功率从原始系统的1800 W降低到1000 W，这反过来又使我们能够在不损失性能的情况下消除集线器的液体冷却。我们目前的测试策略，结果和经验教训，从实验室的经验与地图ASM。我们首先讨论校准的水平上的个别致动器，包括电容位置传感，力响应函数，和个人的闭环位置控制与改进的控制律。然后，我们描述调查到完整的ASM系统-枢纽，执行器，薄壳，和人类-了解如何优化组件之间的相互作用，使用前馈矩阵的动态形状控制。最后，我们提出了我们的结果的前馈矩阵和控制律参数的形式，成功地产生了所需的镜面在1毫秒的建立时间。
The MMT Adaptive optics exoPlanet characterization System (MAPS) is a broad overhaul and upgrade of AO instrumentation at the 6.5-m MMT observatory, from deformable secondary mirror, through pyramid wavefront sensors in both the visible and near-infrared, to improved science cameras. MAPS is an NSF MSIP-funded program whose ultimate goal is a facility optimized for exoplanet characterization. Here we describe the laboratory testing and calibration of one MAPS component: the refurbished MMT adaptive secondary mirror (ASM). The new ASM includes a complete redesign of electronics and actuators, including simplified hub-level electronics and digital electronics incorporated into the actuators themselves. The redesign reduces total power to ⪅300W, from the original system’s 1800W, which in turn allows us to eliminate liquid cooling at the hub with no loss of performance. We present testing strategies, results, and lessons learned from laboratory experience with the MAPS ASM. We discuss calibrations first on the level of individual actuators, including capacitive position sensing, force response function, and individual closed-loop position control with an improved control law. We then describe investigations into the full ASM system – hub, actuators, thin shell, and human – to understand how to optimize interactions between components for dynamical shape control using a feedforward matrix. Finally, we present our results in the form of feedforward matrix and control law parameters that successfully produce a desired mirror surface within 1ms settling time.
MAPS（MMT AO 系外行星表征系统）的发展和现状
DOI：
--
发表时间：
2020
期刊：
Astronomical Telescopes + Instrumentation
影响因子：
--
作者：
K. Morzinski;M. Montoya;C. Fellows;O. Durney;J. Ford;G. West;Andrew Gardner;A. Vaz;N. Anugu;Emily A. Mailhot;Jared Carlson;L. Harrison;Frank Gacon;E. Downey;P. Hinz;T. Jones;J. Patience;S. Sivanandam;Shaojie Chen;M. Lamb;A. Butko;Siqi Liu;T. Hardy;B. Jannuzi
通讯作者：
B. Jannuzi