摘要
光学镜面的散射对光学系统的性能有十分重要的影响。选用可见光0.6328μm、近红外光1.053μm和热红外光10.6μm三种激光波长,利用修正的米氏理论和光学表面的双向反射分布函数(BRDF)研究光学镜面在不同污染条件下激光的传输特性。研究结果表明:当镜面粗糙度远远小于入射光波长(σ<<λ)时,干净镜面的散射强度与σ成正比,与λ成反比。污染镜面散射强度与污染颗粒的尺寸和数量有关,颗粒分布越复杂,散射越显著。另外,波长越短,BRDF越大,散射越复杂。
Scattering of optical mirror surface makes a very important impact on properties of optical system. Laser transmission characteristics with different pollution conditions on optical mirror surface had been researched by using modified Mie theory and Bidirectional Reflectance Distribution Function（BRDF） of optical mirror surface, under three laser wavelengths of the visible light 0.632 8μm, near infrared light 1.053μm and thermal infrared light 10.6μm. The results show that if mirror surface roughness is much smaller than the incident wavelength （ 〈〈 ）, scattering magnitude of clean mirror surface is proportional to σ and inversely proportional to λ. Scattering magnitude of particulate-contaminated mirror surface relates to size and quantities of particles on the mirror surface. The more complex particles distribute, the more significant scattering will be. In addition, when wavelength is shorter, BRDF will be greater, and scattering becomes very complicated.
出处
《红外与激光工程》
EI
CSCD
北大核心
2014年第5期1444-1448,共5页
Infrared and Laser Engineering
基金
国家自然科学基金(60277023)
山东省自然科学基金(ZR2011FM007)
关键词
散射
双向反射分布函数
修正米氏理论
颗粒污染镜面
scattering
Bidirectional Reflectance Distribution Function（BRDF）
modified Mie theory
particulate-contaminated mirror surface
