远红外激光雨中传输损耗的研究  

Link loss of long wavelength infrared laser propagating through rain

作　　者：王喆[1] 汪井源[1] 徐智勇[1] 赵继勇[1] 陈亦望[1] 王荣[1] 韦毅梅[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《红外与激光工程》2015年第10期3092-3097,共6页Infrared and Laser Engineering

基　　金："区域光纤通信网与新型光通信系统国家重点实验室"开放基金资助课题(2013GZKF031304)

摘　　要：激光在雨中传输时,会受到雨滴的散射和吸收作用导致功率衰减。首先,根据Mie散射理论,给出雨中消光系数的计算方法。其次,介绍了Joss和Weibull两种雨滴尺度分布,通过对比分析得出结论 Joss分布更加准确。最后,利用Matlab对远红外激光在雨中的消光系数和链路损耗进行分析。结果表明:消光系数随降雨量的增大而增大;利用光子追踪法计算得到的链路损耗,由于考虑了光束发散角、接收视场角和散射能量,较朗伯-比尔定律更加贴近实际情况。Because of the scattering and absorption of raindrops, laser power attenuates when travelling through the rain. Firstly, according to the Mie theory, the method of calculation of the extinction factor in the rain was presented. Secondly, Joss and Weibull raindrop size distributions were introduced, and the comparative analysis was shown that Joss raindrop size distribution was more precise. At last, the extinction factor and link loss of long wavelength infrared laser in the rain were analyzed by using Matlab. From the analytical results, it is cocluded that the value of the extinction factor becomes larger with rainrate increasing; Considering beam divergence, field of view and scattering energy, the link loss calculated by photon tracing method is more accurate compared with Lamber-Beer Law.

关 键 词：雨中损耗 远红外激光 雨滴尺度分布 MIE散射 光子追踪法 

分 类 号：TN929.12[电子电信—通信与信息系统]