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Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

101
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
101

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科学领域:

  • 原子,分子和光学物理学
  • 激光光谱学 激光光谱学
  • 控制系统工程 控制系统工程

背景情况:

  • 激光频率稳定对于高分辨率光谱和精度测量至关重要.
  • 传统的模拟伺服模块提供了强大的性能,但缺乏灵活性.
  • 现场可编程门阵 (FPGA) 技术为先进的,可适应的控制系统提供了机会.

研究的目的:

  • 为了比较基于FPGA的数字伺服模块与传统模拟伺服模块的性能,用于激光频率稳定.
  • 评估在数字和模拟平台上实施的比例-积分-导数 (PID) 控制的有效性.
  • 评估FPGA模块对于低相噪声激光应用的适用性.

主要方法:

  • 数字 (FPGA) 和模拟PID伺服模块的特征传输功能.
  • 用光学节拍检测测稳定激光器的相位噪声测量单侧带功率光谱密度.
  • 在1120nm和665nm波长使用了两个低相噪声二极管激光器.
  • 使用高精度的光学空洞进行激光频率锁定.

主要成果:

  • 基于FPGA的数字伺服模块表现出与模拟对应器可比的性能.
  • 实现的集成相位噪声水平低至30mrad,相对噪声功率为10−3.3.
  • 在sub-kHz模式下确定激光线宽,主要受光腔限制.
  • 通过开源修改验证了STEMlab FPGA模块的多功能性.

结论:

  • 基于FPGA的数字伺服模块是激光频率稳定模拟系统的可行替代品.
  • 这些数字模块为低相噪声应用提供了出色的性能.
  • FPGA模块的灵活性使它们适合用于原子,分子和光学物理学和激光光谱学的远程控制实验.