机械制冷机是红外探测器组件的重要组成部分，它为红外探测器提供精确、稳定的低温工作环境。机械制冷机普遍采用PID温度控制算法。工程应用中，PID参数的整定大多依赖于调试者的经验，缺少PID参数设计的理论分析。结合制冷机的控制模型，根据波特图和Nyquist稳定判据，分析了PID控制参数的频域设计方法。仿真结果表明，该方法可靠有效，可为机械制冷机PID温度控制参数的在线整定提供指导。

A mechanical cryocooler is one of the important parts of an infrared detector. It provides a precise and stable low temperature operation environment for the infrared detector. In the engineering applications, the tuning of Proportion Integration Differentiation (PID) parameters is mostly dependent on the experience of engineers. Thus, the theoretical analysis of PID parameter design is lacked. The frequency-domain design method of PID control parameters is analyzed according to the Bode diagram, the Nyquist stable criterion and the control model of the cryocooler. The simulation results show that this method is reliable and effective and can provide guidance for the online tuning of PID temperature control parameters of mechanical cryocoolers.