Tilt-correction adaptive optical system for solar telescope of Nanjing University

A tilt-correction adaptive optical system installed at 430mm Solar Telescope at Nanjing University has been in operation. It is made up of a tip-tile mirror, a correlation tracker and an imaging CCD camera. The Absolute Difference algorithm is used in order to detect image motion in the correlation tracker. The sampling frequency of the system is 419Hz. In this paper, the configuration of the system is described. The observation results are reported. Furthermore, the performance of the system is analyzed. The residual jitter of 0.14arcsec has been achieved. The error rejection bandwidth of the system can be adjusted in the range from 5Hz to 28Hz according to the beacon size and the strength of the atmospheric turbulence.