对数正态分布下壳--核型微球对红外的消光

摘要本文研究了对数正态分布下壳—核型微球的消光,数值计算了镀金属微球在红外波段的质量消光系数,比较了壳—核型单分散微球与对数正态分布下多分散微球的质量消光系数的异同.结果表明:当波长较短时,有较大质量消光系数的粒径范围较窄;随波长增加,最大质量消光系数减小,相应的最佳粒径增大;在一定粒径范围内,单分散粒子的质量消光系数比对数正态分布下多分散粒子的大,波长越短,此范围越小;在相同波长、镀覆厚度下,镀铝微球的消光最佳,镀铜的比镀银的好.

THE EXTINCTION OF INFRARED BY MICRO SPHERE PARTICLES HAVING LOGARITHM NORMAL DISTRIBUTION

The extinction of infrared by shell-core micro spheres in logarithm normal distribution was studied and the mass attenuation coefficient of metal coated spheres calculated in infrared with a program prepared by the authors. The mass attenuation coefficient of the shell-core spheres in logarithm normal distribution was compared with that of mono-size spheres. The results show that the range of granularity in the mass attenuation coefficient is narrower when the wavelength is shorter. When the wavelength increases the maximal mass attenuation coefficient reduces and the corresponding optimum size of the spheres increases. In a suitable range of granularity the mass attenuation coefficient of the mono-size spheres is larger than that of the spheres in logarithm normal distribution and the shorter the wavelength the narrower will be the range. With the same wavelength and shell thickness, the extinction effect of spheres coated with aluminum the best. While the extinction of spheres coated with copper compares better than that coated with silver.