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随着国家对水下成像探测、水下资源勘查等应用需求增加,建立符合实际情况的水下光电成像模型,成为目前水下成像研究者的目标。为了探究水下距离选通成像系统性能,建立了距离选通成像系统各个模块调制传递函数模型,以及总的系统调制传递函数模型。对目前市场上主流成像系统所采用的超第二代、第三代像增强器的选通成像性能进行理论对比仿真分析,完成了对水下距离选通成像系统性能模型的仿真。结果表明,前向散射光调制传递函数以及后向散射光调制传递函数随着探测距离以及选通时间的增加呈现逐渐下降趋势,并且前向散射光调制传递函数下降的速度更快;系统调制传递函数随着探测距离、选通时间和空间频率的增加而逐渐下降,并且通过理论模型分析得到典型的第三代像管的性能比超第二代像管的性能在水下距离选通成像过程中更具优势。
With the increasing application of underwater imaging exploration and underwater exploration, the establishment of an underwater photoelectric imaging model in line with the actual situation has become the current goal of underwater imaging researchers. In order to explore the performance of the underwater gated imaging system, the modulation transfer function model of each module of the distance gated imaging system and the overall system modulation transfer function model are established. The simulation performance of the second-generation and third-generation image intensifier used in the mainstream imaging system on the market is theoretically compared and simulated, and the simulation of performance model of the underwater gated imaging system is completed. The results show that the modulation transfer function of forward scattered light and the backscattered modulated transfer function decrease gradually with the increase of detection distance and strobe time, and the transfer function of forward scattered light decreases more quickly. The system modulation transfer The function declines gradually with the increase of the detection distance, gating time and space frequency, and the performance of the typical third-generation image tube is better than the performance of the ultra-second generation image tube in underwater distance gating imaging through theoretical model analysis In the more advantages.