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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。
Laser transmission in the rain, will be the scattering and absorption of raindrops lead to power attenuation. First, according to Mie scattering theory, the calculation method of rain extinction coefficient is given. Secondly, the raindrop size distributions of Joss and Weibull are introduced. The comparative analysis shows that Joss distribution is more accurate. Finally, the extinction coefficient and link loss of far-infrared laser in rain are analyzed by Matlab. The results show that the extinction coefficient increases with the increase of rainfall. The link loss calculated by photon tracing method is more realistic than Lambert-Beer’s law because of considering the beam divergence angle, receiving angle of view and scattering energy Happening.