脉冲激光在3种大气模型下传输的热晕与湍流效应研究

Research of Thermal Blooming and Atmosphere Turbulence of Repetitively Pulsed Laser in Three Atmospheric Models

基于中纬度地区夏季、冬季、热带地区3种大气模型下的实验数据,通过最小二乘法拟合,分别得到了大气的吸收系数随海拔高度变化的函数式,建立了序列脉冲激光在地对空传输的热晕和湍流效应模型,编写了四维程序。通过数值分析的方法,定量地研究了这3种大气模型下的热晕和湍流综合效应。结果显示:高功率脉冲激光束在热带地区传输的热晕和湍流效应比中纬度地区强烈;脉冲激光在夏季传输的热晕和湍流效应要比冬季强烈。

Based upon the experimental data in three climates, including tropical region, summer in mid-latitude region and winter in mid-latitude region, this paper gets the function of absorption coef-ficient by least square method, builds the model of thermal blooming and turbulence of repetitively pulsed laser from ground to air and analyzes the thermal blooming and turbulence by four-dimension-al computer code. Furthermore, the paper simulates thermal blooming and turbulence in three at-mospheric models. The results show that thermal blooming and turbulence in tropical region is more serious than that in mid-latitude＇ region, while thermal blooming and turbulence in summer is more serious than that in winter in the same region.