红磷烟幕对10.6μm激光的消光系数测试研究

Study and test of extinction coefficient of red phosphorus smoke to 10.6 μm laser emission

论述了红磷烟幕的成烟过程与遮蔽特性。在烟幕试验柜中测试了红磷烟幕对两种入射功率10.6μm激光的质量消光系数和红磷烟幕的粒度分布规律;根据米氏散射理论计算了单个红磷烟幕粒子对10.6μm激光的吸收效率因子、散射效率因子和消光效率因子。结果表明:红磷烟幕对入射功率分别为0.552、1.032 W的10.6μm激光的平均质量消光系数分别为0.6027、0.5739 m2/g。成烟5 min时红磷烟幕粒子的平均直径为2.47μm。研究表明,红磷烟幕对10.6μm激光的消光作用以吸收效应为主,其质量消光系数随浓度的增加而下降。同等条件下入射光的功率越大或空气的相对湿度越小,则红磷烟幕的消光系数就越小。

The forming pro cess and screening characteristics of red phosphorus smoke were elaborated. The mass extinction coefficients and granularity distribution of red phosphorus smoke to 10.6μm laser emission with two kinds of incident power were tested in a smoke to laser of chamber. The absorption efficiency factors, scattering efficiency factors and extinction efficiency factors of a single particle of red phosphorus smoke to laser of 10.6μm were calculated according to Mie scattering theory in far-infrared band. By the experiments, the average extinction coefficient of red phosphorus smoke to 0.552 W is 0.6027m^2/g and to 1.032 W is 0.5739 m^2/g. The average diameter of the smoke particles is 2.47 μm when the smoke formed 5 min. By the analysis, the extinction ability of red phosphorus smoke to 10.6μm laser emission depends upon the absorption effect. The mass extinction coefficient decreases while the smoke concentration increases. Under the same condition, the extinction coefficient of the smoke to 10.6μm laser emission will decrease when the power of incident laser emission increases or the air relative humidity decreases.