考虑拼接望远镜子镜之间保持共相位可使拼接镜达到衍射极限，本文建立了一套主动光学实验系统来测量和调整拼接镜子镜之间的相位差和精度以实现子镜之间的共相位。拼接镜由3块正六边形球面子镜组成，子镜对边长为300 mm，曲率半径为2 000 mm。首先，使用Shack-Hartmann传感器和高精度微位移平移台使子镜之间精确共焦，使用球径仪调整子镜之间的高度差到微米量级；然后，运用白光斐索干涉原理对子镜高度差进行调整；最后，运用子孔径衍射原理测量子镜之间的高度差，并调整使其共相位。为了验证标定效果，对光纤光束进行了成像实验，受光纤直径的限制，拼接镜上用于成像的口径为100 mm。实验结果显示，白光斐索干涉的测量精度优于100 nm，子孔径衍射的测量精度优于16 nm，共相位标定后，系统能够实现衍射极限成像，表明提出的方法适用于拼接望远镜的共相位标定。

The segmented telescope can realize the diffraction-limited imaging when segmented-mirrors are in co-phase. Therefore, an active optical experiment system was built to measure and adjust the phase difference between the two segmented mirrors. The segmented telescope is consists of three hexagonal segments with the side lengths of 300 mm and the radius of curvature of 2 000 mm. Firstly, a Shack-Hartmann sensor and high accuracy micro-positioning stages were used to make the segments co-focused in a high accuracy. Then, a spherometer was used to piston the phase difference between the two segments to a few micrometer level and the principle of white light Fizeau interferometry was utilized to adjust the phase difference. Finally, the sub-aperture diffraction method was taken to measure the phase difference and to piston the mirror to reduce the phase difference to near zero. To verify the calibration effects, an imaging experiment was carried out for an optical bundle, the experimental results show that the measurement accuracy of white light Fizeau interferometry is better than 100 nm, and that of sub-aperture diffraction method is better than 16 nm, which demonstrates that the methods introduced are suitable for the co-phase calibration of segmented telescopes.