填料近表层分布对红外隐身涂层发射率的影响

Effects of Pigment Near-surface Distribution on Emissivity of Infrared Stealth Coatings

为研究红外隐身涂层中填料颗粒近表层非均匀分布对其发射率的影响,采用时域有限差分方法计算了单个圆片状填料颗粒在近表层分布时的吸收和散射特性参数,并代入由颗粒掺杂层和粘结剂层组成的双层辐射传输模型,采用Kubelka-Munk理论求解了涂层的表观光谱发射率,研究了填料颗粒近表层聚集程度、体积分数、几何尺寸对发射率的影响。结果表明:填料颗粒近表层聚集时涂层发射率低于均匀分布的情形,减小填料颗粒厚度和掺杂层厚度、提高填料掺杂体积分数和数密度可有效降低涂层的红外发射率。

In order to study the effects of pigment near-surface distribution on the emissivity of infrared camouflage coatings,a two-layer radiative transfer model consisting of pigment dopant layer and binder model was proposed.The absorption and scattering characteristics parameters of individual circular flake pigment particles at near-surface distribution were calculated by time-domain finite difference method,while the apparent spectral emissivity of the coatings was calculated with the Kubelka-Munk theory.The effects of the pigment near-surface aggregation,volume fraction,geometric dimensions on the emissivity were discussed.The results show that the coating emissivity with pigment near-surface aggregation distribution is lower than with at uniform distribution.The infrared emissivity of the camouflage coatings can be reduced by reducing the particle thickness,doping thickness,and increasing the doping volume fraction and number density.