【摘要】 用反常衍射(ADA)理论与实验数据优化拟合方法分析了聚合物分散液晶(PDLC)微滴在633nm激光照射下的散射特性与微滴尺寸、聚合物折射率的关系。在聚合物分散液晶中除了液晶微滴本身的散射以外,还有例如界面散射、杂质散射、材料折射率不均匀等附加散射因子,考虑这些因素以后对反常衍射散射理论进行了修正,提出用参量拟合来测量聚合物分散液晶中聚合物折射率、微滴半径以及液晶体积百分数等参量的方法。测量了微滴的直径在2μm左右聚合物分散液晶的参量。结果表明,对聚合物分散液晶聚合物折射率的误差在5%以内,而对液晶体积分数的测试误差较大,达到10%左右。更多还原

【Abstract】 Parameter fitting between anomalous diffraction approach (ADA) theory and experimental data is applied to analyze scattering properties, which related with droplet size, refractive index of polymer in polymer dispersed liquid crystal (PDLC). Besides scattering from liquid crystal droplets, there are additional scattering factors, such as interface scattering, impurity scattering, and the scattering caused by non-uniform refractive index of the polymer matrix, so ADA model is modified. Parameter fitting approach is proposed to measure refractive index of polymer, radii of droplet, as well as volume percentage of liquid crystal, to measure the parameters of four types of PDLC, in which the diameter of the droplet is about 2 μm. The result indicates that the error of the test for refractive index of polymer is less than 5%, while for volume percent of liquid crystal, the maximum error reaches about 10%.更多还原