舰船尾流激光后向散射特性研究

Study on Laser Backscattering Properties by Ship Wakes

根据尾流气泡群的密度随深度和时间的变化规律以及尾流气泡的浮升运动规律,建立了一种尾流气泡分布模型。基于单个气泡的米氏散射理论,利用多层介质蒙特卡罗模拟方法,对I,IA,IB类海水下的尾流气泡激光后向散射特性进行了模拟。对激光发射深度分别位于海面以下20m和30m处,综合考虑浮游植物影响的散射结果进行了分析。结果表明,沿尾流纵向,由尾流远区到舰船尾流中心区的激光后向散射逐渐增强;海水中浮游植物对后向散射光有显著影响。同时也证明了可利用尾流气泡群的激光后向散射做为鱼雷的引信。

Preliminary bubble distribution model of ship wake is presented according to the law of bubbles density varying with time and depth,and bubble motion.The laser backscattering properties of air bubbles of the ship wakes under I,IA,IB-type seawater are numerically simulated with the multilayer Monte Carlo method and Mie scattering theory.Different results under 20 m and 30 m depth with the effect of phytoplankton are analyzed.Simulation result shows the light backscattering of ship wakes is increased along the ship stern from far to center;and the backscattering is influenced by phytoplankton in ocean obviously.Results show that the laser backscattering of bubbles of the ship wakes can be used as a fuse of torpedo.