| In the biosphere,the eyes of various creatures have different characteristics.In terms of visual imaging,the eyes of different creatures have different imaging methods.Biological compound eyes have the characteristics of large field of view,small size,and high dynamic sensitivity.Researchers have made significant contributions to bionic compound eyes based on the characteristics of biological compound eyes.At present,the rapid development of the field of bionic compound eyes has important applications in the fields of military,medical,lighting,and unmanned driving.As a multi-aperture optical imaging system,the bionic compound eye can recognize and image targets in a large field of view.This paper focuses on the research on the matching problem between curved bionic compound eyes and planar image sensors and the problem of diaphragms of non-uniform curved bionic compound eyes with hexagonal close stitching.A non-uniform curved bionic compound eye structure with curved array is proposed.Zemax software simulated the designed bionic compound eye structure and verified its imaging characteristics.Based on the system,a support method and image stitching method for the compound eye were proposed.The main research contents of this paper include the following three aspects:1)Through the in-depth study of the structural composition and functional characteristics of biological compound eyes,the imaging principle of biological compound eyes was understood.Thereafter,based on the functional organization of each part of the compound eyes,corresponding optical devices were designed and a mathematical model of the bionic compound eyes was established.2)Due to the shortcoming of the angle of view of the planar bionic compound eye,a non-uniform curved bionic compound eye optical system with hexagonal close stitching was designed.A new hexagonal model array algorithm is proposed,and the bionic compound eye model is established in Zemax.This structure improves the light energy utilization rate of curved bionic compound eyes.The optical system must solve the problem of light crosstalk in the system through the diaphragm,so the diaphragm of the compound eye structure is analyzed and calculated.After theoretical analysis,the addition of a hexagonal diaphragm on the inside and outside of the compound eye structure is not established,so the system Cannot solve the problem of light crosstalk.3)Because the hexagonal compact structure cannot solve the aperture problem,another non-uniform bionic compound eye optical system with a curved ring array was designed.In this system,the sub-eyes at different levels have different focal lengths.Through optimization,the object surface can be imaged after compound eyes On a plane detector.The compound eye system has a field of view of 102.8 °,and consists of 13 sub-band sub-eyes,of which the 1-9 level sub-eyes are designed with standard lenses.At the cutoff frequency of 68 lp / mm,the MTF value of each field of view is greater than 0.29;Class 10-13 sub-eyes adopt an aspheric design.By changing the edge sub-eye caliber and field of view to improve the image quality,the MTF value of each field of view of the class 10-13 sub-eyes is greater than 0.28.The distortion of the sub-eyes at all levels in the full field of view is less than 4%,and the RMS radius of the dot map is less than the detector pixel size of 7.4 ?m.In order to avoid the problem of beam crosstalk between the sub-eyes,a single-channel imaging cone-shaped array of compound eyes was designed,and the structure design of curved compound eyes was completed according to high-precision additive manufacturing technology.After tolerance analysis,the image quality of the system still meets the requirements for use. |
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