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为了实现对拼接镜的共焦调整,建立了拼接镜主动光学共焦实验系统。实验中,拼接镜由3块对边长300mm的正六边形子镜组成,子镜为球面,曲率半径为2000mm。采用Shack-Hartmann传感器进行共焦测量,用6个微位移平移台对两块子镜的离焦和倾斜进行调整。每个子镜对应Shack-Hartmann传感器的36个子孔径,用子孔径产生的像点位置偏移计算子镜之间的共焦误差。通过微位移平台调整,可控制子镜的轴向离焦误差优于1μmrms,倾斜误差在两维方向上均优于0.02″rms。实验表明,该方法适用于大型拼接镜面望远镜的共焦标定和实时调整。
In order to realize the confocal adjustment of the splice mirror, a confocal mirror active optical confocal experimental system was established. In the experiment, the stitching mirror consists of three regular hexagonal sub-mirrors with a length of 300 mm on each side. The sub-mirror is a spherical surface with a radius of curvature of 2000 mm. Confocal measurements were made using a Shack-Hartmann sensor, and the defocus and tilt of the two sub-mirrors were adjusted using six micro-displacement stages. Each sub-mirror corresponds to 36 sub-apertures of the Shack-Hartmann sensor and the confocal error between the sub-mirrors is calculated using the pixel point position offset generated by the sub-apertures. The axial defocusing error of the sub-mirror can be controlled to be better than 1μmrms through the micro-displacement platform adjustment, and the tilt error is better than 0.02 "rms in both directions. Experiments show that this method is suitable for the confocal calibration of large splicing mirror telescope Real-time adjustment.