基于C-T模型的光学元件加工表面的光学特性研究

Study on optical properties of machining surface of optical element based on C-T model

基于C-T模型对光学元件加工表面微观形貌的双向反射分布函数(BRDF)进行了分析研究,针对光学元件精密切削表面建立了微观形貌仿真模型,利用Matlab软件仿真并分析了入射光参数和表面微观参数对BRDF的影响。结果表明,相同微观形貌参数下,BRDF函数峰值随入射角度和入射波长的增加而增大;当入射光参数相同时,微观形貌参数的变化会引起入射光在表面产生多次散射和遮挡效应,从而会改变BRDF函数峰值。随着均方根高度的增大,散射和遮挡效应增加,BRDF函数峰值随之减小;随着轮廓宽度的增大函数峰值也增大,随均方根斜率的增大BRDF函数峰值减小。

The bidirectional reflection distribution function(BRDF)of the machined surface morphology of optical elements was analyzed based on C-T model,a simulation model of the surface morphology was established for the precision cutting surface of optical components,the influence of incident light parameters and surface microstructure parameters on BRDF was simulated and analyzed by Matlab software.The results show that the peak value of BRDF function increases with the increase of incident Angle and incident wavelength under the same micromorphological parameters.When the parameters of the incident light are the same,the change of the parameters of the microscopic morphology will cause multiple scattering and shielding effects of the incident light on the surface,which will change the peak value of the BRDF function.With the increase of root mean square height,the scattering and shielding effects increase,and the peak value of BRDF function decreases.The peak value of the BRDF function increases with the increase of the contour width and decreases with the increase of the root mean square slope.