基于主动吸振控制的神光装置打靶偏差研究  

Target Deviation of SG Facility Based on Active Vibration Absorption Control

作　　者：崔文辉 朱健强[1] 何媛琦 刘志刚[1] 樊全堂[1] 林炜恒 董子铭 Cui Wenhui;Zhu Jianqiang;He Yuanqi;Liu Zhigang;Fan Quantang;Lin Weiheng;Dong Ziming(Joint Laboratory on High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《中国激光》2021年第24期19-31,共13页Chinese Journal of Lasers

基　　金：中国科学院国际合作局对外合作重点项目(181231KYSB20170022);中国科学院战略性先导科技专项(A类)(XDA25020304)。

摘　　要：为了解决由振动引起的神光Ⅱ系列装置光束指向精度变差的问题,提出光机耦合主动吸振理论,实现了控制参数的自适应调控和打靶偏差的更小输出。建立神光Ⅱ系列装置全链路光束传输系统模型,搭建空间滤波器光机耦合主动吸振系统,设计自适应模糊PID控制器,分析主动控制参数对输出光角响应峰值的影响并优化控制参数,分析各装置空间滤波器打靶偏差在自适应模糊PID控制主动阻尼动力吸振作用后的控制效果。结果表明,当主动阻尼动力吸振器调谐到最优阻尼时,其打靶偏差较传统方法降低了75.9%,同时被动阻尼动力吸振器也具有降低打靶偏差的功能,其打靶偏差较传统方法降低了31%左右。主动阻尼动力吸振器可根据打靶偏差大小调节速度反馈增益,使控制效率在31.0%~75.9%范围内变化,实现了自适应调节的反馈功能,实验结果与预期一致。Objective The high power laser facility for inertial confinement fusion(ICF)is a large scientific project with ultraprecision,long optical path,and many precision components.Any optical interference caused by environmental vibration,acoustic vibration,or thermal gradient reduces the aiming accuracy and success rate.The confocal lens pair in the spatial filter is the most important component of SG-Ⅱseries devices.Considering the phenomenon where the beam propagation of the confocal lens pair of the long optical path spatial filter deviates from the ideal optical axis and causes poor pointing stability,the existing solutions involve processing the optical elements with higher accuracy or using the beam stabilization technology.Neither of the two solutions starts from the root,and the vibration response of the optomechanical structure affects the beam-pointing stability.The beam-pointing stability has been analyzed by assuming that the structure’s vibration is known but the structure’s transmission characteristics under excitation have not been analyzed.Further,active damping dynamic vibration absorption can be used to analyze the pointing stability of the ICF facility,but the theoretical analysis has not been reported.Therefore,studying the beam-pointing convergence accuracy from the perspective of optical mechanical structure vibration control is necessary.Methods The full link beam propagation model of SG-Ⅱseries facilities was established,and an optomechanical coupling system of spatial filter based on active damping dynamic vibration absorption principle was provided.The peak value formula of the spatial filter’s output optical angular response was derived,and an adaptive fuzzy proportional-integral-derivative(PID)active controller was designed to realize control parameter self-tuning.The influence of active control parameters on the peak value of output optical angular response was analyzed.The control efficiency was defined,and the control parameters were optimized.The adaptive fuzzy PID control alg

关 键 词：物理光学 光机耦合 动力吸振 神光Ⅱ 打靶偏差 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]