激光在烟幕中传输的蒙特卡罗模拟

建立蒙特卡罗计算模型,模拟计算1.06μm脉冲激光在石墨烟幕中的传输.分析透过率与石墨粒子粒径、烟幕浓度、烟幕厚度的关系,用卷积方法计算一定宽度的脉冲激光穿过烟幕后的波形,数值仿真δ脉冲和矩形脉冲激光在各种石墨烟幕中的时间展宽特性.模拟结果表明:石墨粒子存在一最佳半径(0.16μm),该半径的石墨粒子烟幕不仅使激光能量衰减最强,而且产生的时间展宽也最显著;激光脉冲宽度越小,其波形变化和时间展宽越显著,微秒量级脉宽的激光脉冲穿过烟幕后波形变化和时间展宽效应不明显.

Monte Carlo Simulation of Laser Transmission Through a Smoke Screen

A Monte Carlo model is established to simulate transmission of 1.06 μm laser pulse in graphite smoke screen.Relation between transmittance and graphite particle size,smoke concentration,smoke thickness are analyzed.A convolution method is put forward to calculate waveform of pulse laser through smoke.For δ pulse laser and rectangular pulse laser with different width,time broadening is calculated.It shows that there is an optimal radius(0.16 μm) for graphite smoke particles,at which interference effect is the best for 1.06μm laser pulse.For rectangular pulse laser,the smaller pulse width is,the more remarkable change in pulse shape and temporal broadening are.For microseconds width laser pulse,pulse shape changes and temporal broadening are not obvious.