提出一种双边缘测风激光雷达法布里-珀罗(F-P)干涉仪鉴频器的非线性比例-积分-微分(PID)控制方法。该方法利用发射激光在鉴频器校正通道的透过率作反馈进行F-P干涉仪鉴频器的稳定控制。首先给出F-P干涉仪鉴频器透过率的控制模型,由气压波动、温度变化和振动等引起的外界扰动被等效为施加在致动压电陶瓷上的扰动外力。为了进行扰动补偿,用新增的反正切函数设计了非线性PID控制器,提高了经典PID控制方法的反馈增益。仿真结果显示,与经典的PID控制相比,新的非线性控制方法可以使F-P干涉仪鉴频器在更短的时间达到稳定状态,并且稳态误差约减小到原来的1/20。

The paper demonstrates a nonlinear design of the stabilization system of Fabry-Perot(F-P) interferometer which is a frequency discriminator used in double-edge wind lidar. First,a nonlinear model is set up to describe the F-P interferometer transmission peak locking problem. The disturbance caused by air pressure fluctuation,temperature change or mechanical vibration is characterized by the unknown external force acting on piezoelectric ceramics. For such a disturbance rejection problem,the nonlinear proportional-integral-derivative(PID) control is developed by utilizing arctan function to improve the feedback gain of the typical PID control design. The results show that,with the new controller,the discriminator can be stabilized much faster,and the steady-state error is approximately 1/20 of that with the classic PID control.