压电变形镜的率相关迟滞建模与补偿

The multi-object adaptive optics is a powerful technical tool for the observation of the high red-shift galaxies formation and evolution. The deformable mirrors is open-loop controlled in multi-object adaptive optics. It requires more accurate model of the deformable mirrors. In this project, the wiping-out property of rate-dependent hysteresis of the piezoelectric deformable mirrors will be investigated. In order to reduce the shape tracking error of a piezoelectric deformable mirror, the piezoelectric deformable mirror will be accurately modeled, and a feed-forward compensation scheme based on the inverse model will be proposed. These researches provide technical support for the development of the multi-object adaptive optics.

多目标自适应光学是研究高红移星系形成与演化的有力技术手段。该技术的难点在于可变形镜为开环控制，这对可变形镜的建模与控制技术提出了更高的要求。本项目拟探明率相关迟滞的擦除机制，为压电变形镜的迟滞特性建立一种新的率相关模型。并采用逆模型前馈补偿的控制方案，提高压电变形镜的开环控制精度，为发展多目标自适应光学提供技术储备。

压电变形镜是自适应光学系统中常用的执行器件，其存在迟滞等非线性特性。不同于传统的控制方法将其当做线性环节处理，本项目对其迟滞特性进行了相关研究。对单个压电促动器建立了迟滞模型，模型预测与实测位置基本符合；对压电变形镜进行迟滞补偿控制，对比传统控制可获得更高的斯特列尔比。为发展自适应光学对高红移星系等天文现象进行观测提供了技术储备。