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arXiv 1708.05892physics.ins-det
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基于FPGA的原子、分子和光学物理实验数字伺服系统的性能和局限性

The performance and limitations of FPGA-based digital servos for atomic, molecular, and optical physics experiments

Shi Jing Yu, Emma Fajeau, Lin Qiao Liu, David J. Jones, Kirk W. Madison

摘要:

在这项工作中,我们解决的优点,局限性和技术的微妙之处,采用基于FPGA的数字伺服高带宽反馈控制的激光器在原子,分子和光学(AMO)物理实验。具体来说,我们提供的基准性能测试的结果,在实验设置,包括噪声,带宽和动态范围的两个数字伺服内置低,中档价格的FPGA开发平台。将数字伺服结果与使用相同的控制装置(强度稳定)从市售的最先进的模拟伺服获得的结果进行比较。数字伺服系统的反馈带宽为2.5 MHz,受总信号延迟的限制,我们展示了超越模拟伺服系统提供的传递函数的改进,包括具有相位补偿的三极滤波器和两极滤波器,以抑制谐振。我们还讨论了我们的FPGA伺服实现的局限性和设计和使用数字伺服时的一般考虑。

英文摘要:

In this work we address the advantages, limitations, and technical subtleties of employing FPGA-based digital servos for high-bandwidth feedback control of lasers in atomic, molecular, and optical (AMO) physics experiments. Specifically, we provide the results of benchmark performance tests in experimental setups including noise, bandwidth, and dynamic range for two digital servos built with low and mid-range priced FPGA development platforms. The digital servo results are compared to results obtained from a commercially available state-of-the-art analog servo using the same plant for control (intensity stabilization). The digital servos have feedback bandwidths of 2.5 MHz, limited by the total signal latency, and we demonstrate improvements beyond the transfer function offered by the analog servo including a three pole filter and a two pole filter with phase compensation to suppress resonances. We also discuss limitations of our FPGA-servo implementation and general considerations when designing and using digital servos.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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