Research On Multi-Dimensional Information Detection Technology By Miniaturized Compound Eye Structure

With the rapid development of Micro-Opto-Electro-Mechanical System,people have more requirements for optical imaging system,such as small size,light weight,large field of view and high sensitivity of the navigation system,micro wide-angle monitoring equipment,endoscopes and other fields.Due to the improvement of the whole system depends on the unit devices,many scientists have turned their attention to the photoelectric components of the system in recent years.Miniaturization,array and integration of optical elements have become an important direction of the development of optical imaging systems and turned into a frontier subject of high-tech development.The biological world is a wonderful world and the delicate structure and perfect function of some animal organs are amazing.Bio-compound eye is a special visual organ formed by nature in the course of evolution for hundreds of millions of years.It is very ingenious both in structure and function.It has the advantages of small size,light weight,large field of view and high sensitivity and provides an important inspiration for solving the problems in human social life.If a new intelligent bionic compound eye imaging system can be constructed,the detection and perception ability of the system will be rapidly improved by using optoelectronic components to replace the corresponding structure of insect compound eyes,thus providing a new technical means for navigation system,micro-surveillance equipment,endoscopes and other devices.From the research status at home and abroad,it can be seen that the miniaturized compound eye structure has initially formed a principle prototype.However,due to the unique focal length and single function of the sub-lens unit in the compound eye structure,the application of the compound eye structure in multi-depth-of-field imaging is limited.In addition,the structure of the adjustable focal length of liquid compound eye is more complex,and the response speed is slow,which makes it have some practical problems.Aiming at the research of miniaturized bionic compound eye structure,a new bionic compound eye imaging structure with multi-dimensional information detection has been designed and developed in this paper.Based on the multi-channel imaging characteristics of bionic compound eye,the sub-eye unit is studied to collect information of target at different distances and different wave bands of target,breaking through the multi-dimensional information acquisition of miniaturized bionic compound eye: multi-depth-of-field imaging and multi-spectral imaging.The key technologies can realize the advantages of bionic compound eye in multi-spectral information acquisition and achieve the images of objects in different depth of view.Further,it can lay a foundation for the application of bionic compound eye in concealed reconnaissance,medical assistant diagnosis and other fields.The research works main include:(1)The research background and significance of compound eye structure has been introduced,and the research status of biomimetic compound eye structure at home and abroad has been analyzed.The study miniaturized compound eye structure to realize multi-dimensional information detection has been proposed.The basic composition of compound eye structure has been analyzed,and different types of compound eye structure models have also been analyzed.The imaging effects of light under different model parameters have been simulated and traced.The basic model of multi-dimensional information detection for compound eye structure has been given in this paper.Based on ZEMAX optical design software and 3D Studio Max three-dimensional animation rendering and production software,the design of compound eye structure and visible light imaging simulation have been carried out,and the basic imaging characteristics of compound eye structure have been analyzed and verified.(2)A multi-order micro-scale structure with different curvature radius has been proposed to design the sub-eye lens in the compound eye structure,which can realize the multi-order focusing ability of the compound eye structure,so that the compound eye structure can image the object in the multiple different depths of scenes clearly at the same time,and is conducive to the simultaneous detection of the object at different unknown distances by the imaging system.At the same time,a multi-focus compound eye structure with multi-order micro-scale continuous surface has been fabricated by using moving mask exposure technology.By designing a two-dimensional mask with adjustable exposure,the exposure of the photoresist can be continuously adjusted.The multi-focus compound eye structure on the photoresist is integrated and transferred to the fused silica glass substrate by using reactive ion etching technology.(3)Combining the beam-splitting technology with the bionic compound eye,the sub-eye lenses in the compound eye structure have been designed as diffractive beam splitting lenses,which can realize the acquisition of spectral information while imaging by the compound eye structure.Based on the multi-channel imaging characteristics of bionic compound eye,a compound eye structure has been designed to obtain spectral information of different wavelengths by different sub-eyes in different regions and the same focal plane.This structure can avoid the use of an axial distance adjustment device and realize the multi-spectral imaging function of compound eye structure.At the same time,the factors which affects the spectral resolution of the designed multi-spectral compound eye structure have been analyzed and the preparation technology of the multi-spectral structure has also been studied.The fabrication technology has been realized by semiconductor micro-nanofabrication technology,which is compatible with the fabrication technology of multi-focus compound eye structure.(4)An imaging experimental platform has been built to verify the multi-dimensional information detection ability of the miniaturized compound eye structure.The visible imaging,multi-depth-of-field detection technology and multi-spectral information acquisition capability of compound eye structure were experimentally validated.