尾流气泡幕中光子传输时间Monte Carlo仿真  

Monte Carlo Simulation of Photon Transmission Time in Wake Bubble Curtain

作　　者：闫林波 张建生[1] YAN Linbo;ZHANG Jiansheng(School of Sciences,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学基础学院,陕西西安710021

出　　处：《水下无人系统学报》2023年第6期864-870,共7页Journal of Unmanned Undersea Systems

基　　金：陕西省重点研发计划项目(2023-YBGY-016);西安市未央区科技计划项目(201843)。

摘　　要：目前关于尾流气泡幕的Monte Carlo仿真多用于光子散射方向,很少有学者研究光子传输时间的分布。文中基于Henyey-Greestein体散射函数,建立了一种水中脉冲激光的前向散射模型,基于该模型采用Monte Carlo方法仿真光子在气泡幕中的传输过程,得到光子在含有气泡幕的水体中的传输时间分布。并利用该模型分别对不同气泡幕厚度、气泡尺寸以及探测距离的光子传输时间进行仿真。仿真结果表明:气泡幕的厚度越大,光子在气泡幕中的传输时间越长,脉冲激光后沿的后移程度越大,表现为脉冲激光展宽变宽;气泡尺寸越大,气泡对光的散射程度越大,脉冲激光后沿的后移程度越大;随着激光光源与气泡幕的距离变大,光子传输时间表现为整体向后平移,其脉冲宽度及峰值强度变化不大。根据探测器探测到光子的起止时间和光子数的峰值变化可以反映出尾流的特性,从而实现尾流的精确定位、识别与测量。At present,the Monte Carlo simulation of the wake bubble curtain is mostly used to simulate the photon scattering direction,and few scholars have studied the distribution of photon transmission time.In this paper,based on the volume scattering function of Henyey-Greestein,a forward scattering model of pulsed laser in water was established.The propagation process of photons in bubble curtain was simulated by the Monte Carlo method based on this model,and the distribution of transmission time of photons in water containing bubble curtain was obtained.The model was used to simulate the photon transmission time under different bubble curtain thicknesses,bubble sizes,and detection distances.The simulation results show that greater thickness of the bubble curtain indicates longer photon transmission time in the bubble curtain and greater backward movement of the pulsed laser,which is manifested as a broader and wider pulsed laser.A larger bubble size represents a greater scattering degree of the laser by the bubble and greater backward movement of the pulsed laser.As the distance between the laser light source and the bubble curtain becomes larger,the photon transmission time is shifted backward,and the pulse width and peak intensity change slightly.According to the start-stop time of photons detected by the detector and the peak change of photon number,the characteristics of wake can be reflected,thus realizing the accurate positioning,identification,and measurement of wake.

关 键 词：尾流 脉冲激光 气泡幕 Henyey-Greestein函数 Monet Carlo仿真 

分 类 号：TJ630.1[兵器科学与技术—武器系统与运用工程] U674[交通运输工程—船舶及航道工程]