基于Mie理论的激光雾中传输衰减特性研究

Attenuation Characteristics of Laser Propation in Fog Based on Mie Theory

海雾是沿海地区或海上常见天气现象,对激光传输的影响很大。采用雾滴谱指数分布模型,结合能见度与含水量、模式半径的经验关系,应用Mie理论研究激光在海雾中的传输衰减。首先通过Mie衰减模型与其它衰减计算模型的比较,分析说明了其优越性;其次从波长、能见度、温度三个方面对激光衰减的影响作用进行了仿真分析,并得出了海雾衰减的相关结论;最后总结了Mie衰减模型的主要误差来源,提出一种提高模型计算精度的方法,并对其可行性进行了分析。

Sea fog occurs frequently in China coastal area and on the sea, and causes serious influence on laser propaga tion attenuation. Adopted exponential fog droplet size distribution model, and the experience relationship between visibility and liquid water content and mode radius, the laser propagation attenuation in sea fog was calculated by application of Mie theory. Firstly, the superiority of Mie attenuation model was analyzed through the comparison of other model and itself. Sec ondly, the influence of wavelength, visibility and temperature on laser attenuation was analyzed with the simulation model, and some relative conclusions were also abtained. Finally, the main error sources of the attenuation model were concluded, and the feasibility of a method was expected which could improve the calculation precision of the model.