研究了基于四分之一波片-复合双折射光楔-偏振片空间调制结构的定标方法, 并给出了相应的光谱、辐射定标方程。基于结构的偏振调制原理, 提出了线性最小二乘偏振定标方法。仿真分析表明, 该定标方法对于调制结构偏振调制系数的定标精度要比传统的四点法更高, 最小二乘定标法得到的调制系数与真实调制系数间的偏差波动在整个调制周期内约为2×10-4, 且呈随机分布。

Calibration method and process for spatial modulating optical structure composed of quarter wave plate, composite birefringent wedge and polarizer was studied, and the calibrating equations of spectrum and radiation were presented. Based on the polarization principle of spatial modulation, linear least square method for calibration of polarization was provided. By simulation analysis, it is indicated that calibrating accuracy of linear least square method is higher than that of standard four-point method, the modulating coefficient deviation of linear least square method has the maximum of about 2×10-4, and moreover, distributes stochastically in the modulating period.