气象条件对激光散射截获半径的影响

The Influence of Meteorology Parameter on Laser Scatter Intercept Radius

随着激光技术在军事领域的广泛应用,对激光威胁进行探测告警具有重要意义。在利用Mie散射理论对1.06μm脉冲激光在低空大气中传输时散射辐照度的分布进行了分析计算的基础上,以激光测距信号为例,讨论了气象条件变化对激光告警散射截获半径的影响,结果表明:大气相对湿度变化不会对激光散射截获半径产生明显影响;而大气能见度变化对散射截获半径影响较大,由于气溶胶粒子密度的变化,使得截获半径随大气能见度增加而逐渐增大,截获半径达到最大值后随能见度增加而逐渐减小,因此在考核和使用激光告警设备时,必须考虑大气能见度因素的影响。

With the developing appliance of laser technology in military, it becomes important for detecting and warning laser threat signal. The distribution of the scattering irradiance of 1.06μm laser signal in atmosphere is calculated by using Mie scattering theory. Take laser range finder signal for example , discussing the influence of the meteorology parameter change on laser scatter intercept radius, the result was that the changes of relative humidity have unapparent impact on laser scatter intercept radius, while the changes of visibility have evidence impact on laser scatter intercept radius. As the aerosol particle density change with visibility, scatter intercept radius increases with the increase of visibility until it gets the maximum, then scatter intercept radius decreases in spite of the increase of visibility. It was necessary for taking visibility into account in testing and using laser warning equipments.