适用于瞬态条件的多通道序列前光成像系统设计

Design of multi-channel sequential front light imaging system for transient condition

为满足在瞬态条件、不同物距下获得稳定高质量序列图像的成像需求,设计了四通道序列前光高速成像系统。系统采用像空间平行分光,以成像原理为出发点,对系统的设计关键进行分析。以理论计算参数为设计依据进行分镜组(物镜组、场镜及准直镜租、汇聚镜组)设计并分别进行像差独立校正,加入场镜减小系统体积和重量,提升光能利用率,通过视场和光瞳的准确衔接提高光束的传输效果,在此基础上对分镜组进行整合优化,加入分光器件形成最终的四通道序列前光成像系统。设计物距可调光路,使用中通过调节物镜组手轮保证系统在0.5 m~∞物距下的成像质量,同时保持一次像面位置不变,增强系统性能稳定性的同时降低了装调难度。系统可根据实际需要对接收端进行更换,且在分光区域加入分光器件后可拓展至八通道系统。利用装调后的序列前光成像系统进行实验室检测和现场试验,其主要光学性能良好,各通道实测分辨率可达到72 lp/mm,成像一致性大于98%。现场试验结果表明,该光学系统可满足瞬态条件下序列图像的拍摄要求。

In order to obtain stable and high-quality sequential images under transient condition and differ⁃ent object distances,a four-channel sequential front light high-speed imaging system was designed.The system used image space parallel light splitting,taking the imaging principle as the starting point to analyze the key design elements of system.Based on the theoretical calculation parameters,the sub-lens groups(objective lens group,field mirror and collimating lens group,converging lens group)was designed and ab⁃errations were independently corrected.Adding field mirror to reduce the size and weight of system and im⁃prove light energy utilization.The transmission effect of beam was improved by accurate connection of field of view and pupil.On this basis,the sub lens groups were integrated and optimized,and beam split⁃ters were added to form the final four-channel sequential front light imaging system.The object distance ad⁃justable optical path was designed,and the image quality of system at the object distance of 0.5 m~∞was guaranteed by adjusting the handwheel of objective lens group in use,while keeping the position of primary image plane unchanged,enhancing the stability of system performance stability and reducing the difficulty of installation and adjustment.The receiving part of system can be replaced according to actual needs,and the system can be expanded to eight-channel system after adding splitters in the beam splitting region.The installed and adjusted sequential front-light imaging system is used for laboratory testing and field tests,and main optical performance is good.the resolution of each channel can reach 72 lp/mm,and imaging con⁃sistency is greater than 98%.Field test results show that the optical system can meet the requirements for shooting sequence images under transient condition.