基于宽光谱条纹对比度的菲索型光干涉望远镜共相检测与控制方法

Co-Phasing Detection and Control Method Base on Broadband Spectrum Fringe Contrast for Fizeau Optical Interferometric Telescope

菲索型光干涉望远镜得到高分辨率成像的关键是消除各子镜之间相位平移误差。宽光谱条纹对比度检测法是一种检测相位平移误差的有效办法。基于物理光学的基本原理,论证了平移误差与系统点扩展函数的关系,进而仿真了共相远场条纹像,分析了共相检测与控制过程和数据预处理的方法,提出了加权对比度的算法和共相维持的方法,最终得到了共相远场像,并与仿真结果进行了对比。结果表明,实验与仿真的共相远场像能量分布形态以及数值都比较接近,该方法可以实现对子镜之间相位平移误差的检测与控制。

For Fizeau optical interferometric telescope,eliminating the relative phasing piston errors between sub-mirrors plays an important role in realizing high resolution imaging.The broadband spectrum fringe contrast detection method is effective to detect the relative phasing piston errors.In this paper,we analyze the relationship between piston errors and point spread function of system based on physical principles,and simulate the images of co-phasing far field fringe.Furthermore,we describe the experimental process of co-phasing detection and control,and the data preparation method.Besides we provide an algorithm of weighted contrast and a solution of maintaining co-phasing.Finally,co-phasing far field images are acquired and compared with simulation image.The experimental results show that power distribution and FWHM values of these two images are pretty close,and detection and control of phasing piston errors can be realized using this method.