中文摘要：

提出了一种测试扭曲角和光延迟的新方法.该方法属于单波长测试法,具有3个特点：利用具有特殊摩擦方向（一个基板平行摩擦,另一基板环形摩擦）的液晶盒（CH-LC）作为偏振转换器件;利用扇形可变光阑和光探测器,一次性测得偏振方向从0到任意角度连续变化的线偏光通过被测液晶盒后的光强和;采用求光强比的方法消除了由于测试中仪器的吸收对光强的影响.扭曲角和光延迟作为拟合参数利用琼斯矩阵推导出的拟合方程用matlab进行曲线拟合求参数得到.实验证明采用该方法测得结果准确,操作简单快速,实验设备经济.

英文摘要：

A novel method is proposed to measure twist angle and optical retardation of liquid crystal display in this paper. The new method which is one of single-wavelength methods has three characteristics. using circularly and homogeneously aligned LC cell （CH-LC） as a unique polarization-converting devicel using variable sector diaphragm and photodetector to detect the total intensity of transmitted light whose polarization direction is continuously changed from 0 °to any angle; introducing a method of measuring the total intensity ratio of the transmitted light to eliminate the influence of absorption by the polarize,analyzer,CH-LC, liquid crystal display and so on. The twist angle（φ）and optical retardation （△nd） can be derived by using Jones matrix analysis and a curve fitting where φ and And are fitting parameters. Experiment proved the result is accurate, the process of operation is fast, the devices are economical.