Sub region curvature sensing method for survey telescope with larger aperture

The large aperture sky survey telescope needs closed-loop error correction based on the feedback of its wavefront sensing system, so as to give it a better conform to its limit detection ability. In this paper, firstly, the basic theoretical expression of sub region curvature sensing is derived. Then, a joint simulation model is established. The process of sub region curvature sensing is simulated and analyzed by using a com-bination of optical design software and numerical calculation software. Finally, by setting up a desktop exper-iment, the cross-comparison of single-and multi-target curvature sensors is carried out to verify the correct-ness of the algorithm. Compared to the traditional active optical technology, the method proposed in this pa -per can improve the detection signal-to-noise ratio and sampling speed by expanding the available guide stars. For the standard wavefront, compared with the single guide star curvature sensor, the error is 0.02 oper-ating wavelengths (RMS), and the error is less than 10%, which can effectively improve the correction abil-ity of the active optical system.