Infrared Dual Band Base On Hexagonal Band Arrangement Design Of Multi-Aperture Optical System

As a new type of photoelectric detection device,the bionic compound eye optical imaging system can simultaneously locate,track,and identify multiple targets under test,and has outstanding advantages such as large field of view,three-dimensional reconstruction,and high sensitivity.Multi-band optical systems can detect in complex environments,with less detection loss information and stronger anti-interference ability,and have good complementary advantages for target detection and recognition.At present,bionic compound eye optical imaging systems still have major problems such as narrow spectral imaging range,small subsystem aperture,and low space utilization.To solve these problems,this paper conducts research on multi-aperture compound eye optical systems,and combines the advantages of multi-band optical systems,proposing a design of infrared dual band multi-aperture optical systems based on hexagonal band arrangement.This paper focuses on the structural design and optimization analysis of infrared dual band multi-aperture optical systems.Starting from the structural characteristics of natural biological compound eyes and the imaging principles of multi-aperture systems,it deeply discusses and studies the sub-aperture arrangement schemes.Compare the difference of space utilization of different layout models of sub-aperture system with the theory of projection filling factor,completes the derivation and analysis of basic optical parameters,and establish sub-aperture mathematical positioning model,The theoretical formula of dual band achromatism is derived,and the simulation optimization design and array layout of the sub-aperture system and the relay image conversion system are carried out.At the same time,the image quality evaluation process is completed.In view of the complex application scene of the bionic compound eye optical system,this paper firstly carries out non-thermal treatment on the system according to the temperature environment index,and evaluates the non-thermal effect according to the thermal focus shift value and MTF curve.Secondly,the cold reflection analysis of the relay image conversion system was carried out,and the cold reflection effect of the system was evaluated from two aspects of the cold reflection ray backtracking map and NITD contribution value.Then the actual energy transmittance of the compound eye system is estimated.Finally,the image quality evaluation of the compound eye composite system is completed by splicing and assembling.By simulating the actual machining and assembling process,the comprehensive tolerance analysis of the composite system is carried out.Simulation analysis shows that the proposed infrared dual-band multi-aperture compound eye optical system is composed of 91 sub-apertures,and the combined total field of view reaches 96°×87°.The space utilization rate of the hexagonal band arrangement model is11.73% higher than that of the traditional circular arrangement model.The sub-aperture system and the relay image conversion system have no thermal difference in temperature range of-40 ℃ ～+60 ℃,and the cold reflection effect can be ignored.Considering the influence of atmospheric transmission and optical system on imaging,the actual light transmittance of infrared medium and long wave band reaches 62.82% and 63.85%,respectively.The MTF of all the sub-channels from the center to the edge of the compound eye combination system is close to the diffraction limit at 17lp/mm,the RMS radius of the spot diagram of each sub-channel is less than the pixel size of the detector,and the optical distortion value is less than 0.2%.The results of tolerance analysis and comprehensive analysis show that the infrared dual-band multi-aperture compound eye optical system designed in this paper is easy to produce,process and assemble,has good imaging quality,compact structure and strong detection capability,and can be used for multi-target detection and identification in complex environments and military reconnaissance and other fields.This project also provides a new idea and a new way for the design of modern photoelectric imaging system with large field of view for all-weather detection.