大气对生物气溶胶激光雷达性能影响的仿真分析  

Simulation Analysis of Atmospheric Effects on Bioaerosol Lidar Detection Performance

作　　者：苏博家 董吉辉 杨荣 陈春利 陈涌[1,2,3,4] 李晓锋 罗晓翩[1,2,3] 周鼎富 Su Bojia;Dong Jihui;Yang Rong;Chen Chunli;Cheng Yong;Li Xiaofeng;Luo Xiaopian;Zhou Dingfu(Southwest Institute of Technical Physics,Chengdu 610041,Sichuan,China;Lidar and Device Laboratory of Sichuan,Chengdu 610041,Sichuan,China;Key Laboratory of Laser Device Technology,China North Industries Group Corporation Limited,Chengdu 610041,Sichuan,China;College of Optoelectronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]西南技术物理研究所,四川成都610041 [2]激光雷达与器件技术四川省国防科技重点实验室,四川成都610041 [3]中国兵器工业集团有限公司激光器件技术重点实验室,四川成都610041 [4]北京理工大学光电学院,北京100081

出　　处：《中国激光》2024年第6期195-205,共11页Chinese Journal of Lasers

基　　金：四川省科技计划(2022YFG0352);北方激光研究院有限公司青年科技创新项目(K220042-003)。

摘　　要：生物气溶胶极易在大气中传播并引发大范围疾病感染,利用生物荧光特异性的激光诱导荧光(LIF)雷达技术是实现生物气溶胶防区外侦测的有力手段。LIF激光雷达是一种宽光谱系统,受大气能见度和背景辐射的影响与窄光谱系统(如米散射激光雷达)有明显差异。为了评估LIF激光雷达在不同大气条件下的探测性能,利用Modtran5对几种典型的大气能见度和背景辐射(或工作时段)的水平路径上的宽光谱背景辐射与大气传输透过率进行了仿真,进而对不同大气条件下LIF激光雷达的探测性能进行了定量分析。仿真结果表明:在相同的大气能见度条件下,夜间的可探测距离要比白天高出2~4倍,且能见度越好,探测性能差异越大;在相同的工作时段,大气能见度良好时的可探测距离要比大气能见度较差时的高出2~5倍,且夜间探测性能差异比白天大;气溶胶生物性识别的可探测距离要比生物成分识别的可探测距离高出1~2倍,且受大气条件的影响明显。Objective Bioaerosols are extremely easy to spread in the atmosphere and cause widespread disease infections,and a large number of bioaerosols are produced by natural human activities,environmental pollution,and sewage treatment processes.In addition,in the military field,bioaerosols are also the main combat form of biological agents,which have the characteristics of low cost and large destructive range and are used in battlefield or terrorist attacks with high possibility.Therefore,there is a need to develop technical means for realtime detection and early warning of bioaerosols.Lidar technology based on physical effects such as elastic and inelastic scattering between laser and bioaerosol particles,as well as laserinduced fluorescence(LIF),can provide information about the size,shape and composition of aerosol particles and has very fast response,and more importantly,longrange noncontact detection makes the safety significantly improved.So it has gained extensive research from scholars at home and abroad.LIF lidar is a broadspectrum system,which is affected by atmospheric visibility and background radiation.It is obviously different from narrowspectrum systems such as Mie scattering lidar.Different atmospheric conditions can affect the detection performance of LIF lidar,and we hope to quantify the influences.Methods In order to evaluate the detection performance of LIF lidar under different atmospheric conditions,a LIF lidar system is designed,and the formula of the system signaltonoise ratio(SNR)is given.Then the simulation of atmospheric radiation transmission is started,and the broadspectrum background radiation and atmospheric transmission transmittance on the horizontal path of several typical atmospheric visibility and background radiation(or operating hours)conditions are carried out using Modtran5.Finally,the parameters of LIF lidar are set,and then the signaltonoise ratio of LIF lidar is simulated numerically according to the broadspectrum background radiation and atmospheric transmission transmittance

关 键 词：遥感 生物气溶胶 荧光激光雷达 背景辐射 大气能见度 

分 类 号：TN249[电子电信—物理电子学]