基于宽光谱干涉系统的拼接主镜共相位检测技术

 针对拼接式大口径望远镜主镜，提出一种基于迈克尔逊干涉原理基础上的宽带光谱（白光）干涉检测方法，对拼接子镜间相位误差进行实时检测，进而对失调子镜进行相应校正，以实现拼接子镜的共面排布。子镜间相位误差通过干涉图形间的不匹配性进行提取。应用双中心波长组合白光源来提高白光中心条纹的可见度，通过理论仿真，对不同中心波长组合的白光中心条纹可见度进行比较，结果表明：该双中心波长组合白光源系统的应用，可以提高白光干涉中心条纹的信号分辨能力，借以提高检测精度，使得该白光干涉检测系统对拼接子镜间的相位失调误差进行高精度提取。

Detection technology for co-phasing segmented primary mirrors based on broadband interferometric system

A broadband (white-light) interferometric detection method based on the Michelson interferometer principle was put forward to detect the phasing error between the segmented mirrors,and subsequently correct the misaligned segments correspondingly to achieve mirror coplanarity. The phase error between the segments was extracted from the interferograms mismatching. Double-center-wavelength combinations of broadband light sources were applied to raise the center-fringe visibility. Theoretical simulation was carried out to compare different center-fringe visibility for different wavelength combinations. The result shows that the application of the double-central-wavelength combination is effective in raising the ability of signal distinguishing of the white-light center-fringe,improving the measurement accuracy,enabling the broadband interferometric detection system to extract the phase error with high precision.