鳞片石墨粒子红外消光性能数值计算

Numerical Calculation of Infrared Extinction Performances of Graphite Flakes

利用离散偶极子近似（DDA）方法计算了圆形鳞片石墨粒子对中远红外消光性能与波长、圆片直径和厚度等的关系，结果表明，片径3～4mm的圆形鳞片石墨粒子（厚度为直径的1/10）对中远红外的消光性能较好，散射作用大于吸收作用，圆片粒子的消光性能明显好于对应有效半径的球形粒子的消光性能，圆片厚度越薄，消光系数越大，并逐渐趋于最大值。

The infrared extinction performances of round graphite flakes are calculated with discrete dipole approximation（DDA）method. Results show that the round flakes with diameter of 3-4 micrometers and thickness of one-tenth of diameter have better extinction performances in the middle and far infrared wavelengths,and that the extinction is mainly due to scattering. The round flakes have better extinction performances than spheres with the same effective radius. The thinner the thickness of round flakes,the bigger the extinction coefficient,and it will tend gradually to the maximum.