CAJ | 학술논문

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.
격광재우중전수시,회수도우적적산사화흡수작용도치공솔쇠감.수선,근거Mie산사이론,급출우중소광계수적계산방법.기차,개소료Joss화Weibull량충우적척도분포,통과대비분석득출결론Joss분포경가준학.최후,이용Matlab대원홍외격광재우중적소광계수화련로손모진행분석.결과표명:소광계수수강우량적증대이증대;이용광자추종법계산득도적련로손모,유우고필료광속발산각、접수시장각화산사능량,교랑백-비이정률경가첩근실제정황.
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.