Design of optical axis jitters rejecting controller with lag compensator

摘要

Due to the thermal effects, the airflow disturbance and the platform vibration, the random jitters of laser axis are caused, which have a serious impact on the laser coherent combining. If the conventional PID controller is used to reject the disturbance, the control bandwidth will be lager, but the high frequency noise of the system will be significantly amplified, so that the control error increases. The open-loop disturbance data spectrum is analyzed to add a lag compensator. The results show that the system has a good effect on rejecting the jitters of the middle-and-low frequency optical axis, while the high frequency noise has on amplification effect, which decreases the control error of the system.