Abstract: In order to cope with the problem of secondary mirror misalignment due to structural deflection and deformation of the large aperture telescope and the degradation of the image quality, we came up with a strategy that collimated light is proposed to construct artificial star points, and the Shark Hartman wavefront sensor is used to detect wavefront of sub-aperture. We use local distorted wavefront to calculate the secondary mirror misalignment and combine the precise hexapods to realize the real-time correction. Based on the actual parameters of the 1 m aperture off-axis Gregory solar telescope under development, the optical software simulation and mathematical simulation methods are used to analyze the feasibility of wavefront detection of sub-aperture. The simulation results show that when the local aperture of 200 mm is selected and the detection accuracy of the centroid offset reaches 0.01 μm, the wave aberration information can be extracted effectively, so that the telescope meets optical quality after the real-time correction.

Key words: large solar telescope, secondary lens misalignment, distorted wavefront, Shark-Hartman wavefront sensor, simulation analysis