Acta Photonica Sinica, Volume. 48, Issue 9, 912005(2019)
Influence of Fatigue of Piezoelectric Ceramic Actuators on Correction Bandwidth of Deformable Mirrors
The fatigue effect of actuators of deformable mirrors would be generated under the longterm action of the alternating electric field in the process of the wavefront correction in adaptive optics systems. According to the error and openloop 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 openloop 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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XIE Li, WANG Jiaqiu, ZHONG Zheqiang, ZHANG Bin. Influence of Fatigue of Piezoelectric Ceramic Actuators on Correction Bandwidth of Deformable Mirrors[J]. Acta Photonica Sinica, 2019, 48(9): 912005
Received: May. 10, 2019
Accepted: --
Published Online: Oct. 12, 2019
The Author Email: Li XIE (363366255@qq.com)