Large-view-field wavefront detection method based on focal plane Hartmann wavefront sensor

Abstract

The invention discloses a large-view-field wavefront detection method based on a focal plane Hartmann wavefront sensor, and the method comprises the steps: recording the spatial information through alight spot array image detected by a CCD detector in the focal plane Hartmann wavefront sensor, and recording the phase information through a microlens array, i.e., incident light waves of different view fields or angles. Based on the special optical structure, wavefront information of multiple fields of view can be measured at a time, and therefore the effect of a large field of view is achieved.However, a traditional wavefront detector generally has a small field of view or a zero-degree field of view and can only detect a middle field of view. According to the invention, the problem of wavefront error large-view-field measurement is solved, and under the condition that the detection caliber of the wavefront detector is fixed, the view field range of wavefront information which can be restored by single exposure is increased, and the image restoration precision is enhanced.

Description

technical field [0001] The invention belongs to the technical field of wavefront restoration, and in particular relates to a large-field-of-view wavefront restoration method based on a focal plane Hartmann wavefront sensor. Background technique [0002] The density of air in the atmosphere varies in random ways, perturbing the wavefronts of light collected by large ground-based telescopes. Wavefront sensors detect these wavefront perturbations and can be used to drive adaptive optics to compensate for the atmosphere in real time. Alternatively, through computer post-processing, the wavefront detection results can be used to deconvolve the acquired image. The commonly used wavefront sensors mainly include shear interferometer, Shaker-Hartmann wavefront sensor (SH-WFS) and wavefront curvature detector, among which the Shaker-Hartmann wavefront sensor is the most widely used wavefront sensor. front sensor. However, these traditional wavefront detectors are devices with a sma...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: none of the traditional wavefront distortion measurement methods can meet the application requirements of large field of view image clarity. The present invention provides a large field of view wavefront based on the focal plane Hartmann wavefront sensor. The detection method obtains the wavefront information of multiple fields of view through a single detection to restore the blurred image caused by the wavefront disturbance and make the collected image details clearer

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