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通过激光信号在雨介质中传输的实验发现,在大雨环境下,激光信号透射率要比在小雨或微雨的情况下大。这说明光信号在小雨时衰减较大,在大雨时衰减较小。这一现象与人们通常所认为的有所不同。针对降雨对激光信号的影响,根据Mie散射理论和Weibull雨滴尺寸分布模型,分析了不同尺寸的粒子对光的散射作用以及对衰减效率因子的影响,推导出单球粒子对光波的衰减公式,得到了衰减与降雨率的确定关系。通过数值计算发现,与小粒子相比大粒子的前向散射光强更大且更加集中;激光信号在雨介质中传输时,衰减系数在小雨时较大,中雨、大雨时较小,暴雨时不断增大。这一结果与实际情况较吻合,为激光在通信系统中的应用提供了一定的理论依据。
Experiments using laser signals transmitted in rain media found that laser signal transmission was greater in rainy conditions than in light rain or light rain. This shows that the optical signal attenuates more in light rain and less in heavy rain. This phenomenon is somewhat different from what people usually think. According to the influence of rainfall on the laser signal, according to the Mie scattering theory and the Weibull raindrop size distribution model, the scattering of light by different size particles and the influence on the attenuation efficiency factor are analyzed. Relationship between attenuation and rainfall rate. The numerical results show that the forward scattering intensity of large particles is larger and more concentrated than that of small particles. The attenuation coefficient of laser signals propagating in rain medium is larger in light rain, moderate rain, smaller rain, heavy rain Increasingly. This result is in good agreement with the actual situation, which provides a theoretical basis for the application of laser in communication system.