新型高带宽高空间频率复合式压电变形镜研究

项目名称： 新型高带宽高空间频率复合式压电变形镜研究

项目编号： No.11303019

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 马剑强

作者单位： 宁波大学

项目金额： 27万元

中文摘要： 自适应光学系统控制变形镜实时校正大气湍流引起的波前畸变，可大幅提高望远镜的成像分辨率。单压电片变形镜具有结构简单、变形量大、低成本等优点，在8-10米级天文望远镜中有广阔的应用前景。本项目针对单压电片变形镜规模扩大导致带宽下降的矛盾及制备中的技术难题，提出一种由低空间频率压电驱动器阵列和高空间频率单压电片变形镜组成的新型高带宽变形镜，并对其设计与制备过程中所涉及的关键科学问题进行深入研究。主要研究内容包括：分析大气湍流波前畸变的时空特性及波前校正对变形镜的要求；建立变形镜的镜面变形与驱动电压之间的耦合关系；分析变形镜结构参数与校正性能之间的内在联系；解决千级单元变形镜制备过程中的关键技术问题。本项目提出的复合式变形镜结构和结合微系统技术的制备方法具有新意。本项目的实施可为望远镜中低成本高性能变形镜的设计与制备提供新的思路与解决方法，为后续应用奠定理论和技术基础。

中文关键词： 变形镜；自适应光学；天文望远镜；波前校正；压电器件

英文摘要： Adaptive optics system (AO) using a deformable mirrors (DM) improves the resolution of the astronomical telescope significantly by correcting the aberrations introduced by atmospheric turbulence in real time. Unimorph DM has the advantages of simple structure, large stroke, and low cost, making this technology very attractive for 8-10m diameter telescopes. For unimorph DM, up-scaling will degrade its bandwidth. Additionally, the fabrication of unimorph DM with good planarity represents a rather unpleasant technological problem. Considering these practical situations, we proposes a new high-bandwidth DM consisting of a low-spatial-frequency piezoelectric actuators array and a high-spatial-frequency unimorph DM. And the design and preparation of the DM will be investigated. The major investigation issues are summarized as follows. The spatial and temporal characteristics of the atmospheric turbulence wavefront distortion and how it drives the requirements imposed on DMs will be investigated. The coupling model between DM deformation and the drive voltages will be build. The intrinsically relationship between DM structure parameters and correction performance will be explored for DM optimization. The preparation technology of one thousand channels DM will be developed. The proposed composite DM structure and the f

英文关键词： Adaptive optics system (AO) using a deformable mir；adaptive optics；telescope；wavefront correction；piezoelectric device