O437.2 98042378Mie散射系数计算方法的研究=Study of calculat-ing method of Mie scattering coefficient[刊,中]/王少青,任中京,张希明,何芳,江海鹰(山东建筑材料工业学院.山东.济南(250022))∥应用光学.—1997,18(2).—4—9介绍一...O437.2 98042378Mie散射系数计算方法的研究=Study of calculat-ing method of Mie scattering coefficient[刊,中]/王少青,任中京,张希明,何芳,江海鹰(山东建筑材料工业学院.山东.济南(250022))∥应用光学.—1997,18(2).—4—9介绍一种计算Mie散射系数的新方法,给出计算实例。图3参9(严兰)展开更多
The radiative properties of three different materials surfaces with one-dimensional microscale random roughness were obtained with the finite difference time domain method(FDTD) and near-to-far-field transformation.Th...The radiative properties of three different materials surfaces with one-dimensional microscale random roughness were obtained with the finite difference time domain method(FDTD) and near-to-far-field transformation.The surface height conforms to the Gaussian probability density function distribution.Various computational modeling issues that affect the accuracy of the predicted properties were discussed.The results show that,for perfect electric conductor(PEC) surfaces,as the surface roughness increases,the magnitude of the spike reduces and eventually the spike disappears,and also as the ratio of root mean square roughness to the surface correlation distance increases,the retroreflection becomes evident.The predicted values of FDTD solutions are in good agreement with the ray tracing and integral equation solutions.The overall trend of bidirectional reflection distribution function(BRDF) of PEC surfaces and silicon surfaces is the same,but the silicon's is much less than the former's.The BRDF difference from two polarization modes for the gold surfaces is little for smaller wavelength,but it is much larger for the longer wavelength and the FDTD simulation results agree well with the measured data.In terms of PEC surfaces,as the incident angle increases,the reflectivity becomes more specular.展开更多
文摘O437.2 98042378Mie散射系数计算方法的研究=Study of calculat-ing method of Mie scattering coefficient[刊,中]/王少青,任中京,张希明,何芳,江海鹰(山东建筑材料工业学院.山东.济南(250022))∥应用光学.—1997,18(2).—4—9介绍一种计算Mie散射系数的新方法,给出计算实例。图3参9(严兰)
基金Project(2009AA05Z215) supported by the National High-Tech Research and Development Program of China
文摘The radiative properties of three different materials surfaces with one-dimensional microscale random roughness were obtained with the finite difference time domain method(FDTD) and near-to-far-field transformation.The surface height conforms to the Gaussian probability density function distribution.Various computational modeling issues that affect the accuracy of the predicted properties were discussed.The results show that,for perfect electric conductor(PEC) surfaces,as the surface roughness increases,the magnitude of the spike reduces and eventually the spike disappears,and also as the ratio of root mean square roughness to the surface correlation distance increases,the retroreflection becomes evident.The predicted values of FDTD solutions are in good agreement with the ray tracing and integral equation solutions.The overall trend of bidirectional reflection distribution function(BRDF) of PEC surfaces and silicon surfaces is the same,but the silicon's is much less than the former's.The BRDF difference from two polarization modes for the gold surfaces is little for smaller wavelength,but it is much larger for the longer wavelength and the FDTD simulation results agree well with the measured data.In terms of PEC surfaces,as the incident angle increases,the reflectivity becomes more specular.
