雾中红外辐射传输衰减特性分析

Analysis on Attenuation Characteristics of Infrared Radiation Transmitting in Fog

研究雾中红外辐射衰减特性,有助于提高武器装备雾天条件下的红外对抗能力。基于大气辐射传输软件(CART)、Beer-Lambert定律、Mie散射理论和雾滴谱分布函数,计算雾滴粒子群红外辐射透过率,对红外辐射在平流雾和辐射雾中的传输衰减特性进行研究。以近红外辐射1. 064μm、中红外辐射3. 8μm和远红外辐射10. 6μm在轻雾条件下为例,结合3个地区实测数据,分析了能见度、传输距离、入射光波长和晴朗大气透过率计算值对平流雾和辐射雾总透过率的影响。结果显示在轻雾条件下,辐射雾衰减小于平流雾衰减,远红外辐射10. 6μm具有很好的传输性能,地区气象参数不同对其有显著影响。

Fog droplet particles have severe absorption and scattering effects on infrared radiation.Researching its attenuation characteristics is important for improving the performance of weapons in fog.Based on the CART software, the Beer-Lambert law, the Mie scattering theory and the spectral distribution function of the particle group of fog droplets, the transmittance of infrared radiation through the fog particle group was calculated. The attenuation characteristics of infrared radiation in advection fog and radiation fog were analyzed respectively. Taking the 1. 064 μm near-infrared radiation, 3. 8 μm mid-infrared radiation,and 10. 6 μm far-infrared radiation in the light fog environment as the example, and by use of the field data from three Chinese regions, the effects of visibility, transmission distance , the wavelength of the incident light, and the transmittance in clear atmosphere on the overall transmittance of advection fog and radiation fog were analyzed. The results show that: 1) Under the condition of light fog, the attenuation in radiation fog is less than that in advection fog;and 2) The 10. 6 μm far-infrared radiation has satisfying transmission performance, on which the regional atmospheric parameters have great influence.