Preparation And Testing Of Surface Bionic Compound Eye Structure

In recent years,optical imaging technology has been widely used in military field,agricultural production,scientific research,industrial production,space exploration and other fields in people's daily life.However,the traditional single-aperture imaging technology has disadvantages such as small field of view and easy loss of image information at the edge of field of view.To overcome these shortcomings,people were inspired by the compound eye structure of insects and proposed a curved surface bionic compound eye imaging system.The system has the advantages of compact structure,large field of view and high dynamic sensitivity.However,the traditional curved bionic compound eye imaging system has a series of problems,such as limited field of view angle and low definition of edge imaging.It can not really reflect the advantages of compound eye imaging system.The process of making it is also complicated.In order to overcome these problems,this paper proposes two solutions.The preparation of curved surface bionic compound eye system and wide field imaging can be realized conveniently.The specific research content is as follows:1.Firstly,a uniform microlens array was prepared on a stretched-out elastomer PDMS film substrate by means of hot embossing.Then the planar microlens array is transformed into a curved microlens array by elastic deformation.The transformation from planar microlens array to curved microlens array is realized through the stretching deformation of an elastomer.The results show that this method can manufacture the curved microlens array with uniform structure and good appearance.The results of optical property test show that the curved microlens array has a good imaging effect.2.In order to solve the problem of small field angle and low definition of edge image in uniform microlens array,a set of image plane transform system is designed in this paper.The system can transform the image of the focal surface into the focal plane.It is convenient for plane image collector to collect image information.We use ZEMAX software to simulate thesystem,the results show that the maximum RMS radius of the system under different field of view is 5.58 ?m.More than 80% of the energy is concentrated in a circle of 6.5 ?m.Compared with other image plane conversion systems,the transformation system designed in this paper is improved in RMS radius and energy accumulation.3.We also propose a bionic compound eye imaging system for large field of view curved surface with graded focal length microlens array.The microlens array of the system is arranged in layers symmetrically at the center of a circle.To arrange 17 adjacent microlens arrays radially outward.It has 817 imaging units.According to the relevant geometrical optical principle,the lens data at all levels are calculated.The result of ZEMAX software simulation shows that the system can effectively improve the edge image quality,imaging field can reach 128°×128°.