Abstract: Spatial chopping is a technique widely used in infrared(IR) astronomy to improve the signal-to-noise ratio ofweak IR sources. The W. M. Keck Ten Meter Telescope,currently the world's largest telescope, uses anactively controlled secondary mirror to perform its twoaxis spatial chopping. This 0.5 m gold plated berylliummirror must execute extremely precise motions over awide range of amplitude, frequency, duty cycle, andchop orientation. This paper describes the design,implementation, and test of the mirror drive andcontrol system. Details of the drive electromechanicaldesign, reaction cancelling system, gravityoff-loading, and operations of its unique adaptivecontrol system are presented. Laboratory test data areshown and discussed, and a short video of the mirrorsystem in operation (shown at the conference) is alsobriefly described. !0
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机译：摘要：空间斩波是一种在红外天文学中广泛使用的技术，用于提高弱红外源的信噪比。 W. M. Keck十米望远镜是目前世界上最大的望远镜，它使用主动控制的辅助反射镜进行两轴空间斩波。这款镀金铍合金镜面的直径为0.5 m，必须在幅度，频率，占空比和斩波方向的广泛范围内执行极其精确的运动。本文介绍了反光镜驱动和控制系统的设计，实现和测试。详细介绍了驱动机电设计，反作用消除系统，重力卸载以及其独特的自适应控制系统的操作。显示并讨论了实验室测试数据，还简要描述了运行中的镜系统的简短视频（在会议上显示）。 ！0
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