Research On Infrared Multi-target And Background Compounding System Based On Microlens Array

Infrared target simulation system, which can realistically simulate infraredradiation and space motion characteristics of target or background, which is used todetect infrared system anti-interference ability, tracking accuracy and other technicalindicators. We could test and evaluate its performance synthetically, optimize theresults in the design and improve the actual combat ability of weapons continuallyin the process of the design and producing.In this paper, an infrared multi-target and background compounding systembased on microlens array is presented, which can simulate infrared radiation andspace motion characteristics of a target and eleven interferences, And it also can beadded to the infrared background to simulate complex scenes. Multiple target andbackgrounds compounding system includes three parts： multiple targets andinterferences compounding system, DMD infrared background generation systemand motion simulation system.Firstly, the overall scheme and working principle of the multi-targets andbackground compounding system are studied, the spatial distribution of12sub-projection systems are optimized; the energy efficiency of multiple targets andinterferences compounding system is analyzed and demonstrated, to provide atheoretical basis to optimize system energy efficiency; after the comprehensiveanalysis and comparison of the compound ways, microlens array is decided as thecompound device for the multi-target and back-ground compounding system.Secondly, the design parameters of multiple targets and interferencescompounding system are decided according to (SUT) performance parameters. Thecompounding projection system which satisfies the actual requirements is obtainedby optimizing the system and analyzing the image quality and tolerance.Furthermore, the expanded beam principle of microlens array is analyzed. Anda theoretical mathematical model is established to determine the structuralparameters and energy efficiency of microlens array. Multiple targets andinterferences compounding system are simulated using Tracepro. The simulation isto verity the model and determines the energy efficiency of the system, thereasonableness of the system structure is demonstrated. The operating temperatureof target or interference blackbody is decided.Finally, the structure and working principle of DMD device and infraredbackground generation system based on DMD are analyzed. According to theperformance parameters of DMD device and SUT, the design parameters of projection system and illumination system in the infrared background generationsystem based on DMD are decided. The design of the systems, which includeanalysis of the image quality, tolerance of the projection system, and the uniformityof the illumination system.