激光水下目标探测中的光束扩展

The Spreading of the Light Beam in Underwater Target Detection by Laser

对激光水下目标探测中海水对光束的空间和角度扩散进行了深入研究。模拟得到的水下光斑半径的分布曲线与国外的研究结果相吻合。通过模拟给出了水面光斑半径的分布曲线和水面光斑内目标反射光子出射角度的分布曲线。对海面上的海浪和泡沫对光束扩散的影响进行了模拟研究，证明了此影响在风速小于１４ｍ／ｓ时可以忽略。

The spatial and angular spreading of the light beam in a oceanic lider system are studiedusing the Monte Carlo Method. The distribution curves of the radii of underwater spots giv-en by simulation are found to be in good agreement with those published abroad and part ofthem is verified by experiment. The radius distribution curves of sea surface spots and angu-lar distribution curves of reflected photons from a target with sea surface spots have been ob-tained by simulation for the first time, The influences of foam and wave on the spreading ofthe light beam are also investigated and simulated. It is concluded that the influences can beneglected if the speed of wind is lower than 14 m/s.