An optical chopper is described that has comparable performance to commercially available units. The new chopper is built within the frame of a hard disk drive, and uses the existing motor and its disk for operation. The rotation speed is measured using a photo-interrupter and is adjusted with a microcontroller. Chopping frequencies from 150 Hz to 1650 Hz with phase jitter less than 0.38 degrees per revolution have been demonstrated. The hardware design and control algorithm are described, and results showing the phase jitter characteristics are presented. The performance of this new design is comparable to that of commercial optical choppers, and can be built for a fraction of their cost.

中文翻译：

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低抖动，低成本的光学斩波器

描述了一种光学斩波器，其具有与市售单元相当的性能。新的斩波器内置在硬盘驱动器的框架内，并使用现有的电动机及其磁盘进行操作。旋转速度使用光电断路器测量，并通过微控制器进行调整。已经证明了从150 Hz到1650 Hz的斩波频率，每转的相位抖动小于0.38度。描述了硬件设计和控制算法，并给出了显示相位抖动特性的结果。这种新设计的性能可与商用光学斩波器相媲美，并且仅需花费其一小部分即可制造。