压电陶瓷驱动器疲劳对变形镜校正带宽的影响

谢丽; 王家秋; 钟哲强; 张彬

doi:doi:10.3788/gzxb20194809.0912005

光子学报, 2019, 48 (9): 0912005, 网络出版: 2019-10-12

压电陶瓷驱动器疲劳对变形镜校正带宽的影响

Influence of Fatigue of Piezoelectric Ceramic Actuators on Correction Bandwidth of Deformable Mirrors

论文大纲

谢丽 ^*王家秋钟哲强张彬

作者单位

四川大学电子信息学院, 成都 610065

自适应光学变形镜压电陶瓷疲劳特性校正带宽 Adaptive optics Deformable mirror Piezoelectric ceramic Fatigue characteristics Correction bandwidth

摘要

在自适应光学波前校正过程中, 变形镜驱动器在交变电场的长期循环作用下会产生疲劳效应.根据自适应光学控制系统的误差传递函数和开环传递函数, 结合压电陶瓷驱动器的疲劳特性, 分析了压电陶瓷驱动器在产生疲劳后对变形镜延时、校正带宽和系统稳定性的影响.结果表明, 对于同一种压电陶瓷, 其压电性能、介电性能及机电耦合性能均随着循环次数的增加而下降, 其中机电耦合性能对变形镜延时影响最大.在变形镜校正畸变波前过程中, 压电陶瓷驱动器的循环使用次数越多, 变形镜延时越长, 其校正得到的误差抑制带宽和开环带宽越小, 而相位裕度变化范围表现出缓慢增大的趋势, 系统的稳定性也随之变差.

Abstract

The fatigue effect of actuators of deformable mirrors would be generated under the longterm action of the alternating electric field in the process of the wavefront correction in adaptive optics systems. According to the error and openloop transfer functions of adaptive optics control systems and the fatigue characteristics of piezoelectric ceramic actuators, the influence of the fatigue of piezoelectric ceramic actuators on the delay time, correction bandwidth of deformable mirrors and system stability was discussed. The results show that the properties of piezoelectric, dielectric and electromechanical coupling of piezoelectric ceramic all decrease with the increasing of cycle times, in which the electromechanical coupling properties have the greatest influence on the delay time of the deformable mirrors. In the process of correcting the distortion wavefront by the deformable mirrors, both the error rejection bandwidth and the openloop bandwidth decrease with the increasing of the cycle of the piezoelectric ceramic actuators and the delay time of the deformable mirrors. Meanwhile, the variation range of phase margin increases gradually, resulting in the worsening of the stability of the system.

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谢丽, 王家秋, 钟哲强, 张彬. 压电陶瓷驱动器疲劳对变形镜校正带宽的影响[J]. 光子学报, 2019, 48(9): 0912005. XIE Li, WANG Jiaqiu, ZHONG Zheqiang, ZHANG Bin. Influence of Fatigue of Piezoelectric Ceramic Actuators on Correction Bandwidth of Deformable Mirrors[J]. ACTA PHOTONICA SINICA, 2019, 48(9): 0912005.

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