水雾隐身技术是一种较为理想且经济适用的目标特征信号控制技术。本文从辐射传输方程出发，考虑水雾粒子的本身辐射和散射，提出以红外表观透射率评价水雾粒子的红外隐身性能。应用Modified Differential Approximation（MDA）法结合MIE理论，计算了水雾粒子红外表观透射率随水雾粒子浓度和粒径的变化关系，得到水雾粒子最佳红外隐身粒径。结果表明：水雾粒子的红外表观透射率随粒子浓度的增加而减小，但当粒子的浓度增加到一定值时，红外表观透射率基本保持不变；水雾粒子的红外表观透射率随粒径的增加先减小后增大，当探测波段为3-5μm时，水雾粒子的最佳红外隐身粒径为6μm；而探测波段为8—12Hm时，水雾粒子的最佳红外隐身粒径为12μm。
The water fog stealth technology is an ideal and economical target feature signal control technology. From the radiation transfer equation, considering the radiation and scattering of fog particles themselves, infrared apparent transmittance is proposed to evaluate infrared stealth performance of fog particles. Combined with the Modified Differential Approximation （MDA） method and MIE theory, the influence of the volume fraction and diameters on infrared apparent transmittance ratio is investigated. The best particle size for infrared stealth has been obtained. The results show that the infrared apparent transmittance decreases with the increase of particle volume fraction. However, the infrared apparent transmittance tends to be a fixed value when the volume fraction reaches a certain value. With the increase of particle size, infrared apparent transmittance decreases at first and then increases. On condition that the detecting waveband is 3 - 5 μm, the best particle size for infrared stealth is 6 μm, but when the waveband switches to 8 - 12 μm, the best size is 12μm correspondingly.
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