基于两级高速倾斜镜闭环控制的光束稳定技术研究

在光束稳定系统中, 受到传输介质和平台振动等因素的影响, 通常同时存在能量与频率成反比特性的宽带扰动和平台机械谐振引起的在某个特定频率点出现的窄带扰动。为了解决光束稳定系统中由大幅度、高频率窄带扰动和宽带扰动引起光束抖动的问题, 设计了基于两级高速倾斜镜串联控制的光束稳定系统, 提出了利用前级光束稳定系统校正窄带扰动, 后级光束稳定系统校正宽带扰动的控制算法, 实现了对大幅度高频率窄带扰动和宽带扰动的同时抑制。在相同条件下, 对比了传统的控制方法和两级高速倾斜镜联合校正控制系统的残余误差。仿真和实验表明, 提出的系统结构和控制方法能够有效地抑制光束稳定系统中存在的扰动。

Abstract

In the laser beam stabilizing system, there are the broadband disturbance where energy is inversely proportional to the frequency and the narrowband disturbance at a particular frequency because of the transfer medium and vibration of the optical platform. In order to reduce the laser beam jitter caused by both kinds of disturbance, the control structure of fast steering mirrors (FSM) in series was put forward, and the control algorithm was presented, in which the first laser beam stabilizing system aimed to the narrowband disturbance, and the second laser beam stabiliting system resolved the broadband disturbance. So the disturbance can be restrained at the same time. The residual errors are compared between the proposed method and the classic control algorithm, and the simulation results and experimental results verify the availability of the proposed method.

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周睿, 李新阳, 沈锋, 李梅. 基于两级高速倾斜镜闭环控制的光束稳定技术研究[J]. 光学学报, 2016, 36(12): 1214002. Zhou Rui, Li Xinyang, Shen Feng, Li Mei. Laser Beam Stabilizing System Based on Close Loop Control of Two Fast Steering Mirrors in Series[J]. Acta Optica Sinica, 2016, 36(12): 1214002.

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