Shack-Hartmann wavefront detection method based on region detection and reconstruction

Abstract

The invention provides a Shack-Hartmann wavefront detection method based on region detection and reconstruction. The Shack-Hartmann wavefront detection method comprises the following steps: dividing amicrolens array into a plurality of detection regions, wherein each detection region comprises a plurality of detection sub-apertures; overlapping at least one row or one column of detection sub-apertures among different detection areas, so that complete coverage of the detection regions on the whole wavefront is ensured; selecting one detection sub-aperture in each detection region to serve as areference sub-aperture, enabling different detection areas to carry out correlation operation and inclination extraction on sub-aperture images in the areas based on different reference sub-apertures, and enlarging the dynamic measurement range of Shack-Hartmann on the premise that it is ensured that a correlation algorithm is effective; performing correlation operation and inclination amount extraction on other sub-aperture images in the detection regions and the reference sub-aperture image to obtain inclination of the detection wavefront; and solving the wavefront aberration according to the obtained inclination of the detection wavefront. The scheme can be applied to the field of extended target detection, and can effectively improve the dynamic measurement range of Shack-Hartmann.

Description

technical field [0001] The invention relates to the technical field of optical wavefront detection, in particular to a Shaker-Hartmann wavefront detection method based on area detection and reconstruction. Background technique [0002] Due to its simple structure, strong real-time performance, and low requirements on the working environment, the Shack-Hartmann wavefront sensor is widely used in real-time wavefront detection of adaptive optics and active optics, laser beam quality diagnosis, and surface inspection of large optical components. Shape detection, image quality detection of astronomical telescopes and ophthalmology and other fields. In the field of wavefront detection and image quality detection related to astronomical telescopes, the Shack-Hartmann wavefront sensor is mainly used for the detection of random atmospheric turbulence during the operation of the telescope or the image quality of the telescope itself due to changes in environmental factors such as grav...

AI Technical Summary

Problems solved by technology

Using the extended source as a reference target requires a correlation algorithm to calculate the offset between the sub-images, and then extract the tilt of the wavefront, and larger aberrations may cause the farther detection sub-aperture to obtain a different field of view in the extended target The structure of the sub-images is different, so it is impossible to use a unified reference sub-image to correlate other sub-images to obtain the tilt of the wavefront

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