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抑制光束抖动的压电倾斜镜高带宽控制
引用本文:凡木文,黄林海,李梅,饶长辉.抑制光束抖动的压电倾斜镜高带宽控制[J].物理学报,2016,65(2):24209-024209.
作者姓名:凡木文  黄林海  李梅  饶长辉
作者单位:1. 中国科学院自适应光学重点实验室, 成都 610209; 2. 中国科学院光电技术研究所, 成都 610209; 3. 中国科学院大学, 北京 100049
摘    要:提出了一种抑制光束平台抖动和压电倾斜镜机械谐振的方法从而提高系统校正带宽和跟瞄精度.通过分析双二阶滤波器参数对频率特性的影响,提出了一种双二阶滤波器的设计方法,并把这种设计方法结合比例积分(PI)控制算法用于抑制光束平台抖动和压电倾斜镜机械谐振.最后,对经典PI控制算法和增加了双二阶滤波器的PI控制算法进行了实验比较,在相同的条件下,增加了双二阶滤波器的PI控制带宽比经典PI控制带宽提高了近1倍,对平台抖动控制精度提高了5倍以上.实验结果表明:增加了双二阶滤波器的PI控制算法对抑制光束平台抖动和压电倾斜镜机械谐振简单有效,可以提高系统校正带宽和跟瞄精度.

关 键 词:自适应光学  光束抖动  压电倾斜镜  滤波器
收稿时间:2015-07-16

High-bandwidth control of piezoelectric steering mirror for suppression of laser beam jitter
Fan Mu-Wen,Huang Lin-Hai,Li Mei,Rao Chang-Hui.High-bandwidth control of piezoelectric steering mirror for suppression of laser beam jitter[J].Acta Physica Sinica,2016,65(2):24209-024209.
Authors:Fan Mu-Wen  Huang Lin-Hai  Li Mei  Rao Chang-Hui
Institution:1. Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; 2. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:Laser beam steering or pointing, which stabilizes the beam direction, is critical in many areas, such as optical communication systems, astronomy and directed-energy systems etc. However, the disturbances including atmospheric turbulence and mechanical jitter on platform may degrade the pointing accuracy. A proportional-integral (PI) feedback control commonly has been used in the track loop with a fast steering mirror. To compensate dynamic disturbance effectively, the laser beam steering control system must have a larger bandwidth than the disturbance bandwidth. But the control bandwidth is limited by the noise of the sensor, computing latency, and the light energy. So, a simple proportional-integral (PI) feedback controller of a piezoelectric fast steering mirror (PFSM) can only compensate the broadband disturbance of the atmospheric turbulence, but cannot effectively compensate a larger amplitude narrowband jitter because of the low control bandwidth. Moreover, when the control bandwidth is tuned to high, the mechanical resonance of the PFSM can cause the instability of the system. An improved dual two-order filter assisted high-bandwidth control algorithm to improve the pointing accuracy and error attenuation capability is proposed. This method can control a PFSM for suppression of laser beam jitter. The influence of filter parameters on frequency characteristics is analyzed, and then, a practical design method is proposed. The dual two-order filter can combine the characteristics of traditional notch filter and two-order low-pass filter, and can also obtain any desired amplitude in the interesting frequency ragion with little influence on the others. The principle of the proposed filter for suppressing the mechanical resonance of the PFSM and the narrowband disturbance is elaborated. And then, the different dual two-order filters are designed according to the frequency content of the PFSM and the narrowband disturbance. Finally, the proposed dual two-order filter assisted PI control algorithm and classic PI control algorithm are compared with each other. Experimental results show that, in the same conditions, the pointing accuracy of the proposed two-order filter assisted PI control algorithm is nearly 5 times better than that of the classic PI control algorithm, and the error attenuation bandwidth is one time higher. It also indicates that the proposed algorithm does not need an additional sensor; it is simple and effective for the suppression of the mechanical resonance of a PFSM and that of the narrowband disturbance, hence it improves the system error attenuation bandwidth and the beam pointing accuracy.
Keywords:adaptive optics  laser beam jitter  piezoelectric fast steering mirror  filter
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