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为探索舰船尾流后向光学检测方法,研究了尾流气泡对水中激光脉冲后向散射特性的影响。首先基于Fournier Forand体积散射函数,利用蒙特卡罗(Monte-Carlo)方法理论分析了近距离尾流气泡对激光脉冲后向散射特性的影响。然后,采用蓝绿激光脉冲作为光源,实验研究了模拟尾流气泡对激光脉冲后向散射信号的影响。研究表明,尾流气泡的存在会使得激光脉冲后向散射信号前沿位置在时域左移,后沿位置在时域右移,信号时域宽度增加,能量增强,峰值增大且位置在时域左移。最后根据研究结果提出了一种基于激光脉冲后向散射信号特征变化的舰船尾流气泡后向检测方法。
In order to explore the backward optical detection method of ship wakes, the influence of wake bubbles on the backscattering characteristics of laser pulses in water was studied. Firstly, based on the Fournier Forand volume scattering function, the Monte Carlo method is used to analyze the effect of close-spaced wake on the backscattering characteristics of laser pulses. Then, using the blue-green laser pulse as the light source, the effect of the simulated wake bubble on the laser pulse backscattering signal was experimentally studied. The results show that the presence of wake bubbles can shift the front position of laser pulse backscatter signal to the left in the time domain and the back edge position to the right in the time domain. The time domain signal width increases, the energy increases, the peak value increases and the position is in the time domain Move left According to the results of the study, a new method based on the characteristics of backscattering signals of laser pulses is proposed.