摘要
在 Mie 散射理论的基础上，计算了8～14μm 波段不同半径云粒子的散射特性，对散射相函数的特点进行了分析。根据积云、层云和卷云的粒子分布，对三种云的散射相函数、散射系数、吸收系数以及对辐射衰减90％的距离进行了计算，并根据辐射经过云层的传输方程，分析了云粒子前向散射对辐射传输的影响。结果表明：积云和层云对辐射衰减90％的距离分别在20 m、60 m 以内，而卷云的可达2km 以上。
Based on the Mie scattering theory,the scatting characteristics of the clouds in different size for the 8 ~14μm waveband were calculated,and the traits of scatting phase function were analyzed.According to the particle dis-tribution of cumulus,stratus and cirrus,the scatting phase functions,the scattering coefficients,the absorption coeffi-cients and the distances that decrease the radiance by 90% were calculated for three types of clouds.Combining with the transfer equation of the radiance passing through the cloud,the effects of the forward scattering on the radiance transfer were analyzed.The results shows：the distances that decrease the radiance by 90% of cumulus and stratus are within 20m and 60m respectively,but that of the cirrus excess 2km.
出处
《激光与红外》
CAS
CSCD
北大核心
2015年第8期918-923,共6页
Laser & Infrared
关键词
红外探测
云
红外辐射传输
MIE散射
infrared detecting
cloud
IR radiance transportation
Mie theory
