针对当前军、民用领域对新型生物消光材料的需求, 将制备出的絮状颗粒等效为子弹玫瑰花型粒子, 将其作为单元颗粒构建不同结构的生物颗粒, 并对生物颗粒结构进行参数化表征, 采用离散偶极子近似法(DDA)计算生物颗粒远红外波段平均消光效率因子。结果表明: 生物颗粒远红外波段平均消光效率因子与尺度因子和孔隙率成正相关。在研究平均消光效率因子与尺度因子和孔隙率关系的基础上, 构建了生物颗粒远红外波段平均消光效率因子模型, 计算时间较DDA法缩短, 计算误差在10％以内。模型的构建将为生物消光材料发展以及形态控制提供理论基础。

With the increasing demands for new biological extinction materials in military and civilian fields, the artificially prepared flocculent particles were equivalent to bullet rosette particles, which were further used to build the biological particles with different structures as a unit particle. And the structures of biological particles were characterized by parameterization. Then the discrete dipole approximation (DDA) method was used to calculate the average extinction efficiency factor for biological particles in the far infrared band. The results indicate that the average extinction efficiency factor of biological particles is positively correlated to the size factor and porosity in the far infrared band. Based on studying the relationship of average extinction efficiency factor with size factor and porosity, the biological particles average extinction efficiency factor model in the far infrared band was constructed. Using that model, the computation time was shorter than that of the DDA method, and the calculation error is less than 10%. The model provides a theoretical basis for the further development and morphology control of biological extinction materials.