红外辐射在水雾中衰减计算的修正方法研究

水雾系统对红外光谱有着强烈的衰减作用,因此在军事目标的各种制导对抗中被予以高度的关注。以Mie散射理论为基础,分析了粒子对红外光谱前向散射的聚集特性,定义了近前向散射比,并确定了在应用朗伯比尔定律时需修正的粒子尺度和散射半角的范围。通过大量计算发现,单独将粒子尺度和散射半角的乘积作为独立变量计算的视消光系数不够精确。在中远红外波段,前向散射附近的小角度内散射强度积分与粒子尺度和散射角都成正比,若红外波长为定值,则与粒子半径成正比。最后根据前向散射规律给出了两个不单独以x.θ为变量的经验计算公式,使得对水雾消光的修正计算更加简便精确。

Study on the correctional method for the attenuation calculation of infrared radiation in the water fogs

Water fogs system can mightily attenuate the infrared spectrum, so more and more attention has been paid to this problem in military. Based on the Mie theory, the collective characteristic of the particles forward scattering was analyzed. The near forward scattering ratio was defined, also the particle size and scattering DBC case were confirmed when the Lambert-Beer law was applied. A mass of calculation revealed that the visual extinction coefficient calculated with the combined parameter p = x x theta was not accurate, and that the near forward scattering ratio was in direct proportion to both the particle size and scattering angle in the band of middle and far infrared. When the infrared wavelength was fixed, the near forward scattering ratio was in direct proportion to the particle radius. Finally, according to the law of forward scattering, two experiential functions whose variables were not only the p = x x theta were given, by which the correction calculation for light extinction was made easy and exact.