Research On Aberration Measurement And Correction Technology Of Aerial Remote Sensing Imaging System Based On Computational Imaging

With the development of science and technology,people have higher and higher requirements on the imaging quality of optical imaging systems.The imaging systems based on geometric optics lose a lot of information such as phase,polarization and spectrum during the imaging process,and the imaging quality is easily affected by aperture,atmosphere and imaging distance.In order to improve imaging quality,some imaging systems begin to introduce adaptive optics,which can measure and correct system aberrations in real time.However,the introduction of Hartmann sensor and corrector will complicate the imaging optical path and cost is high,so it is difficult to be widely used in miniaturized equipment.In order to improve the imaging quality of optical systems and meet the requirements of simple structure and low cost,an aberration correction method for coherent imaging systems is proposed based on the phase recovery technology of computational imaging.This method does not need to introduce additional hardware in the optical path.The optical intensity information of the focal plane and the defocusing plane is obtained by defocusing the CCD sensor.Based on the optical intensity distribution of the two planes,the phase recovery algorithm is used to solve the aberration in the frequency domain of the exit pupil,and the phase distribution of the aberration in the frequency domain of the exit pupil is obtained.In the process of solving the aberration in the frequency domain of exit pupil,it is necessary to use the optimization algorithm to optimize the evaluation function of the phase recovery algorithm.FR conjugate gradient method and genetic algorithm are respectively used to solve the problem.In order to restrain the "precocious" phenomenon of the genetic algorithm,this paper makes some improvements on the classical genetic algorithm,adopts the strategy of dual competition and parallel recombination,and introduces the catastrophe model.After the above improvement,the phenomenon of "precocious" is effectively inhibited.In order to verify the feasibility of the proposed method,simulation and experimental studies were carried out based on the parallel optical path.The results showed that the energy gradient function value of the simulation results increased by14.25% after the filtering of the aberration filter in the exit eye frequency domain,which proved that the proposed aberration correction method can be used to correct the aberration of the imaging system.