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为了分析水下激光成像探测系统的探测能力,根据水下蓝绿激光主动成像系统的成像过程,分析了目标与背景的辐射特性、海水后向散射特性、距离选通特性以及激光发射器和接收器的性能,提出了一种基于光束扩展函数(BSF)的探测灵敏度模型。该模型在海水散射系数与衰减系数之比介于0～1的范围内都适用。通过对给定参数的系统进行分析计算,进一步讨论了激光发散角、系统接收口径和图像传感器选通门宽等因素对系统探测能力的影响。结果表明:当选通门宽等于激光脉冲宽度时,系统的探测深度达到最大。模型的建立将为系统设计和系统参量的优化选择提供理论依据。
In order to analyze the detection ability of underwater laser imaging detection system, according to the imaging process of underwater blue-green laser active imaging system, the radiation characteristics of target and background, the backscattering characteristics of seawater, distance gating characteristics, laser emitter and receiver A new detection sensitivity model based on beam expansion function (BSF) is proposed. The model is applicable in the range of seawater scattering coefficient and attenuation coefficient between 0 ~ 1. Through the analysis and calculation of the system of the given parameters, the influence of the laser divergence angle, the receiving aperture of the system and the gate width of the image sensor on the detection capability of the system is further discussed. The results show that when the gate width is equal to the laser pulse width, the detection depth reaches the maximum. The establishment of the model will provide a theoretical basis for the optimal selection of system design and system parameters.