基于纳米磁性液体驱动的液态变形镜系统研究  

Research on magnetic fluid based liquid deformable mirrors

作　　者：吴智政[1] 孔祥会[1] 吴君秋 刘梅[1] 谢少荣[1] 

机构地区：[1]上海大学精密机械工程系,上海200072

出　　处：《仪器仪表学报》2016年第7期1509-1516,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(51205245);上海市自然科学基金(15ZR1415800);上海市教委创新重点项目(14ZZ092)项目资助

摘　　要：波前校正器对自适应光学系统的性能起着关键性的作用。以纳米磁性液体为驱动载体,提出了一种新型液态波前校正器设计方法。与传统的固态变形镜相比,磁液变形镜具有镜面连续光滑、变形幅度大、制造成本低和驱动器易于扩展等优点。首先阐述了磁液变形镜系统的设计结构,提出了一种磁液表面银纳米薄膜自组装制备方法,用以提高磁液变形镜镜面反射率;然后结合建立的磁液变形镜镜面动力学模型,提出了一种镜面分布式PID控制方法;最后基于制作的磁液变形镜原型样机,搭建自适应光学实验平台对变形镜性能进行了实验验证,结果表明所设计的液态变形镜及其镜面控制方法能有效控制镜面变形,从而实现期望的光波校正性能。Wavefront correctors play a very elementary role in the performance of the adaptive optics（ AO） system. In this paper,a new liquid deformable mirror is proposed based on the actuation of the magnetic fluid. Compared with solid deformable mirrors,the magnetic fluid deformable mirror（ MFDM） has some major advantages such as extremely smooth surfaces that naturally follow the equipotential surfaces created by magnetic fields,large stroke,low cost per actuator and easy actuator expansion,etc. In this work,the design structure of the liquid mirror is first introduced and the self-assembly method for the preparation of the silver liquid-like film is used to improve the reflectivity of the mirror surface. Then the model of the magnetic fluid deformable mirror is established and a distributed PID control method is proposed for the mirror surface shape control. Finally,based on the fabricated prototype of the liquid deformable mirror,an experimental AO system is set upto evaluate the performance of the deformable mirror,which shows the proposed control method can effectively control the surface of the liquid mirror,thus,the desired wavefront can be obtained.

关 键 词：纳米磁性液体 液态变形镜 银纳米薄膜 多场耦合 分布式PID控制器 

分 类 号：TH74[机械工程—光学工程]