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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。
The relationship between the scattering properties of polymer dispersed liquid crystal (PDLC) droplets under 633nm laser irradiation and the droplet size and the refractive index of the polymer was analyzed by the optimized fitting method of the theory of anomalous diffraction (ADA) and experimental data. In addition to the scattering of liquid crystal droplets themselves in the polymer dispersed liquid crystal, there are additional scattering factors such as interface scattering, impurity scattering and material refractive index nonuniformity. After considering these factors, the theory of anomalous diffraction scattering is modified, and the parameter Fitting method to measure the polymer refractive index of the polymer dispersion liquid crystal, droplet radius and liquid crystal volume percentage parameters. The parameters of polymer dispersed liquid crystal with diameter about 2μm were measured. The results show that the error of refractive index of polymer dispersed liquid crystal polymer is within 5%, while the test error of liquid crystal volume fraction is larger, reaching about 10%.