基于可调偏振度源的PSIM偏振光谱仪线偏振度测量结果定标校正

Calibration and correction of linear polarization measurement results of PSIM spectro-polarimeter based on adjustable polarization source

提出了一种基于可调偏振度源的偏振定标方法,利用方法完成了基于偏振光谱强度调制(PSIM)技术偏振光谱仪的线偏振光偏振度测量结果定标校正。以可调偏振度源输出的不同偏振度的线偏振光作为待测光源,用PSIM偏振光谱仪测量待测光源输出得到原始数据。将原始数据解析处理得到的偏振度谱与待测光源输出的理论偏振度谱进行线性拟合,得到校正系数。利用该校正系数对PSIM偏振光谱仪的测量处理结果进行定标校正。结果表明:在有效测量波段内(500~650nm),定标校正后PSIM偏振光谱仪的线偏振度测量解析精度明显提高,与待测光源输出的标准偏振度值间的最大误差由0.017减小到约为0.003,基于可调偏振度源的偏振定标校正方法具有可行性。

A polarization calibration method based on adjustable polarization source is proposed,and the calibration and correction of measurement results of degree of linear polarization of spectropolarimeters based on polarization spectral intensity modulation(PSIM)technique are completed by using this method.The linearly polarized light with different degrees of polarization from the adjustable polarization source is used as the source to be measured,and the original data is obtained from the output of the source to be measured by the PSIM spectropolarimeter.The correction coefficient is obtained by linearly fitting the polarization degree spectrum obtained by analyzing the original data and the theoretical polarization degree spectrum output by the light source to be measured.The results of the PSIM spectropolarimeter were calibrated and corrected by using the coefficients.The results show that in the effective measuring band(500~650 nm),the measurement accuracy of the PSIM spectropolarimeter is significantly improved after calibration and correction,and the maximum error between the PSIM and the output standard polarization degree decreases from 0.017 to about 0.003,which indicates that the polarization calibration and correction method based on the adjustable polarization degree source is feasible.