基于色散条纹传感器的拼接镜面共相的实验研究  

Experimental Study of Segmented Mirrors Co-Phase Using Dispersed Fringe Sensor

作　　者：张勇[1,2] 张靓[1,2,3] 刘根荣[1,2] 王跃飞[1,2] 张亚俊[1,2] 曾裔中[1,2] 李烨平[1,2] 

机构地区：[1]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [2]中国科学院天文光学技术重点实验室,江苏南京210042 [3]中国科学院研究生院,北京100049

出　　处：《光学学报》2011年第2期76-81,共6页Acta Optica Sinica

基　　金：国家自然科学基金(10703008;11073035);中国科学院知识创新工程重要方向项目(KJCX-YW-T17)资助课题

摘　　要：研制极大望远镜的拼接主镜时,为使得望远镜系统成像质量达到衍射极限,子镜的定位精度需要满足共相位要求,那么必须对子镜之间的平移误差进行实时精确检测和校正。在对色散条纹检测和色散哈特曼检测原理分析的基础上,建造了一台色散条纹传感器,并在室内拼接镜面主动光学实验系统上开展检测实验,验证了检测信号和平移误差之间存在确定的函数关系,可实现对平移误差的间接测量。针对实验结果分析了误差产生的原因,总结了影响检测精度的主要因素有:条纹对比度、光谱曲线定标、非线性最小二乘法,并提出了解决方案,以完善数据处理的计算方法。在±15μm的测量范围内,可达到20 nm的检测精度。Abstract For segmented primary mirror of extremely large telescope, in order to make the image quality of telescope system reach the diffraction limit, sub-mirrors positioning accuracy requires to meet the requirements of co-phase. So the piston errors between sub-mirrors need accurate measurements and corrections in real time. On the basis of analyzing dispersed fringe sensing （DFS） and disperse Hartmann sensing （DHS） principles, a dispersed fringe sensor was built and some detection experiments on an indoor segmented mirror active optics experimental system were carried out. A certain relation is confirmed between the sensing result and relative piston error value of sub-mirrors. So piston errors can be detected indirectly. And experimental results were analyzed for error factors, which affect the measurement accuracy greatly. They are fringe visibility, spectral curve calibration, nonlinear least squares and so on. During the real test experiments, solutions are also proposed to improve the data processing. The results indicate that the present measurement accuracy is up to 20 nm in the range of ±15 μm.

关 键 词：主动光学 平移误差 色散条纹传感器 拼接镜面 子镜共相 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]