Wavefront detection method based on multiple patterns in subapertures of Hartman wavefront detector

Abstract

The present invention belongs to the adaptive optics technical field, and relates to a wavefront reconstruction algorithm under a condition that first six Zernike patterns exist in the subapertures of a Hartmann wavefront detector. According to the ideas of the wavefront reconstruction algorithm, a back camera in the Hartmann detector is arranged on the defocus plane of a microlens array; a light spot is made to be expanded; the sub-wavefronts which go through low-order distortion are obtained through using the light intensity distribution of the light spot. Analog computation is performed on the optical response of the second Zernike pattern to the sixth Zernike pattern according to the subapertures of the Hartmann wavefront detector, which is just indicated by a figure 1 in the descriptions of the invention, and therefore, a subaperture response matrix can be obtained; the Zernike pattern response light spot array of the overall wavefronts can be measured through using a traditional method; the pattern coefficient vector of each sub-wavefront is solved through the subaperture response matrix; each pixel of the overall wavefront response matrix is composed of the pattern coefficient vectors of the sub-wavefronts; and the overall wavefront constructed by using the response matrix can maintain the high resolution of adaptive optical imaging and improve wavefront detection sensitivity.

Description

Technical field [0001] The invention belongs to the technical field of adaptive optics, and is a wavefront detection method based on Hartmann wavefront detectors. Involving the wavefront reconstruction algorithm when there is aberration outside the tilt in the subaperture of the Hartmann wavefront detector, so that multiple mode coefficients can be obtained in the subaperture, correspondingly increase the diameter of the wavefront, and improve the wavefront detection Sensitivity. Background technique [0002] When a telescope is used to observe celestial targets, due to the random interference of atmospheric turbulence, the imaging light wavefront is dynamically distorted, resulting in a decrease in the imaging resolution of the telescope. The adaptive optics system can detect and correct the distorted wavefront caused by atmospheric turbulence in real time to restore the ideal high-resolution imaging of the telescope. Hartmann wavefront detector is a wavefront detector widely ...

AI Technical Summary

Problems solved by technology

[0011] In view of the design principle of the Hartmann wavefront detector, it also constitutes the following disadvantages: 1) Since the sub-aperture divides the distorted wavefront into sub-wavefronts, the detection light energy is limited by the sub-aperture, which limits the imaging limit of the adaptive system 2) The sub-aperture is designed to be equal to the atmo

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