Large-field-of-view survey telescope wavefront curvature sensing method, device and equipment, and medium

Abstract

The invention discloses a large-field-of-view survey telescope wavefront curvature sensing method, device and equipment, and a medium. The large-field-of-view survey telescope wavefront curvature sensing method comprises the steps of: carrying out coarse alignment on a large-caliber main focus assembly, and carrying out imaging through using staggered curvature sensors located at two sides of a focal plane to obtain an out-of-focus star point graph; acquiring the boundary of the out-of-focus star point graph, and segmenting the out-of-focus star point graph into a plurality of sub-aperture regions, wherein each sub-aperture region is divided into a pure internal region without a boundary and a boundary-containing region; in the pure internal regions, solving wavefront curvatures corresponding to the pure internal regions; in the boundary-containing regions, solving the wavefront curvatures and the wavefront slopes corresponding to the boundary-containing regions, and estimating the parameters of the constrained wavefront slopes by using the maximum likelihood; and carrying out comprehensive arrangement and analysis on the solved wavefront curvatures and the constrained wavefront slopes to obtain wavefront phase information of the telescope. In this way, the finally solved wavefront sensing result is more accurate, the correction time is shortened, and the correction precision is improved.

Description

technical field [0001] The invention relates to the technical field of telescopes, in particular to a wavefront curvature sensing method, device, equipment and medium of a large-field survey telescope. Background technique [0002] The increase of the telescope caliber can not only effectively improve the resolution ability of nearby targets, but also improve the light-gathering ability of the telescope with the square law, which can effectively improve the signal-to-noise ratio of faint target imaging, expand the limit detection capability, and finally realize the detection of the farther-reaching universe. exploration. Therefore, large-aperture and large-field telescopes are the key to verifying the latest theories of cosmology and increasing the academic discourse power in the fields of time-domain astronomy in the future. [0003] The large aperture and large field of view telescope has developed rapidly in the past two decades. In order to obtain higher sky survey effi...

AI Technical Summary

Problems solved by technology

However, for large field of view sky survey systems, the single aberration range of the phase difference technology is less than one wavelength, which makes it unable to effectively target the edge field of view with large aberrations of the survey telescope; at the same time, the skylight background and vignetting caused Non-uniform illumination of the pupil will also affect the accuracy of phase recovery

Therefore, there are still many limiting factors for the application of phase difference technology in the wavefront sensing system of active optical telescopes for sky surveys

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