Diffractive optical imaging system wavefront inversion algorithm based on phase difference method

Abstract

The invention discloses a diffractive optical imaging system wavefront inversion algorithm based on a phase difference method. The algorithm comprises the following steps: 1, a diffractive optical imaging feature characterization model containing the diffractive efficiency and the spatial shift characteristics of the diffractive optical imaging system is built; 2, based on a maximum likelihood method, a phase difference wavefront inversion model for the diffractive optical imaging system is built; 3, based on a scalar diffraction theory, a defocusing diffractive phase expression and a defocusing diffractive efficiency characterization model are deduced; 4, according to the spatial shift characteristics of the diffractive imaging, based on an isoplanatic region blocking idea, a focus surface space-variant degraded image and a defocus plane space-variant degraded image are subjected to blocking processing; and 5, a simulated annealing-based particle swarm algorithm is used to carry out global optimization solution on the phase difference wavefront inversion model, and the wavefront information corresponding to different view fields is outputted. A support is provided for the space application of a future super large aperture thin film diffractive optical imaging system.

Description

technical field [0001] The invention belongs to the field of optical remote sensing imaging, and relates to a wavefront inversion algorithm for a diffractive optical imaging system, in particular to a wavefront inversion algorithm for a diffractive optical imaging system based on a phase difference method. Background technique [0002] The thin-film diffractive optical imaging system has the characteristics of super large aperture, short processing cycle, low cost, and light weight, and has become an important development direction for space payloads of high-orbit satellites in the future. However, limited by the diffraction imaging mechanism, compared with the traditional catadioptric system, the thin-film diffractive optical imaging system has various aberrations and large wavefront distortion, resulting in serious image quality degradation. High-precision inversion of wavefront distortion has scientific research significance and engineering application value for applicati...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the existing wavefront inversion method cannot be fully applied to the diffractive optical imaging system and is limited by hardware, the present invention provides a wavefront inversion algorithm based on the phase difference method for the diffractive optical imaging system

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