Design And Development Of Wide FOV High Resolution Optical System Based On Multisacle Imaging Principle

In the field of optical imaging,optical system obtain the amount of spacial information content is determined by the field of view and resolution.In order to obtain greater spatial range and more spatial detail information,the optical system has been developing towards the high resolution and the wide field of view.Wide field of view and high resolution imaging system is widely used in many areas such as people's livelihood,business,scientific research and military operation because of its outstanding observation range and target resolution.However,for traditional single optical system,the field of view and resolution are a pair of contradictory parameters,and it is difficult to increase field of view and resolution of the optical system simultaneously.In recent years,multi-scale optical imaging design has been proposed to divide the optical system into two parts: the former primary objective lens and the secondary multi-aperture relay imaging array.This method design integrates the large field information acquisition capability of the objective lens and the local aberration correction capability of the multi-aperture relay imaging array.It starts with the most essential principle of the optical design and the geometric aberration correction,which solves the contradiction between wide field of view and high resolution.Therefore,it is one of the best methods to realize wide field of view and high resolution imaging.This paper focuses on the multi-scale imaging design,and the corresponding solutions and design examples are presented for the defects and shortcomings of multi-scale imaging systems.The main research work is as follows:(1)According to the multiscale imaging principle,the local field wave aberration of the secondary multi-aperture relay imaging array is calculated.Thus it is concluded that the local field aberration of the relay imaging arrays has no rotational symmetry.Then the correction method of local field aberration and system spherical aberration is obtained.And then the free surface described by the XY polynomial is used to simulate the multi-aperture array of the secondary relay lenses,which verifies the rationality that the multiscale and multiaperture imaging system can realize wide field of view and high resolution imaging.(2)The non-rotational symmetry of the local field aberration of the multiscale optical system is not conducive to the compact design of the system.In order to realize the rotation symmetry of local field aberration of the system,the main objective structure of multiscale optical system is designed as monocentric.Through the simulation analysis of the detection capability of the moncentric multiscale optical system with no geometric aberration in the ideal conditions,the relationship between the main parameters of the system focal length and aperture is obtained.Then combined by the elimination of aberration theory and under the guidance of it,the moncentric main lens is designed as a refraction double layer moncentric ball lens and a reflective moncentric spherical mirror separately.And then the monocentric multiscale optical systems design is accomplished by combining the secondary relay imaging array.The accomplished system has compact structure,large aperture,long focal length,wide field of view and other properties.(3)In order to improve the imaging range of moncentric multiscale optical system,the focusing method of moncentric multiscale optical system is researched so that the system can clearly imaging the objects at different distances.The focus adjustment methods based on lens moving and the electric control of the liquid crystal lens are adopted.The simulation results show that both methods can improve the clearly imaging range of the optical system,and the focus adjustment method based on electric control of the liquid crystal lens is compact,flexible and small.In addition,the focus adjustment method based on electric control of the liquid crystal lens reduces the focus workload compared to the method of mechanical focus adjustment.(4)Combined with the foveated imaging of the human eye retina,a novel imaging system with wide field imaging and high resolution scanning of the interesting area is proposed based on monocentric multiscale 3×3 relay lens system.The novel imaging system can realize high resolution dynamic scanning of the target area within wide field of view,which greatly reduces the amount of data sampled from the entire imaging system.Thus the burden of subsequent image transmission and processing is lightened,and it effectively solves the contradiction between wide field of view,high resolution and data bandwidth in the imaging system.(5)The moncentric multiscale optical system prototype with 3×3 relay lens is designed and developed.The development process includs the optomechanical design,tolerance analysis,fabrication,assembly and so on.Then the imaging performance of the optical system prototype is tested experimentally.It is proved that the imaging performance meets the requirements of the design specification and verifies the correctness of the design,fabrication and assembly of the optical system.The whole optical system prototype is relatively simple in system structure and complexity,thus reducing the difficulty of assembly and operation of the system,and the system volume and weight are controlled within a certain range.