偏振激光雷达增益比定标方法对比研究  

Polarization lidar gain ratio calibration method:a comparison

作　　者：童奕澄 童学东[2] 张凯[1] 肖达 戎宇航 周雨迪 刘崇[1] 刘东[1] TONG Yi-cheng;TONG Xue-dong;ZHANG Kai;XIAO Da;RONG Yu-hang;ZHOU Yu-di;LIU Chong;LIU Dong(State Key Laboratory of Modern Optical Instrumentation,College of Optical Science and Engineering,Zhejiang University,Hangzhou 310027,China;NingBoIron&Steel Co.,Ltd.,Ningbo 315807,China;Ningbo Research Institute,Zhejiang University,Ningbo 315100,China)

机构地区：[1]浙江大学光电科学与工程学院现代光学仪器国家重点实验室,浙江杭州310027 [2]宁波钢铁有限公司,浙江宁波315807 [3]浙江大学宁波研究院,浙江宁波315100

出　　处：《中国光学》2021年第3期685-703,共19页Chinese Optics

基　　金：Supported by National Key Research and Development Program of China(No.2016YFC1400900);National Natural Science Foundation of China(No.41775023);Excellent Young Scientist Program of Zhejiang Provincial Natural Science Foundation of China(No.LR19D050001)。

摘　　要：增益比定标误差是影响偏振激光雷达退偏比精度的主要因素之一,观测前必须进行准确的增益比定标。本文分析了现存多种增益比定标方法的基本原理,并通过实验对比了+45°法、±45°法、△45°法、旋转拟合法与退偏器法等增益比定标方法的定标准确性与优缺点。实验结果表明:△45°法、±45°法与旋转拟合法在对准偏失角较小的情况下定标相对准确,但±45°法与旋转拟合法操作较为繁琐。+45°法在无对准偏失角的情况下定标误差仍较大。退偏器法操作最简便,但会受到非理想退偏器的制约。通过理论分析与实验对比,本文给出了增益比定标方法的最佳选择,即在一般情况下采用△45°法定标,在有高精度退偏器的情况下采用退偏器法定标。Gain ratio calibration error is one of the most significant factors affecting the accuracy of a polarization lidar depolarization ratio.This paper analyzes the basic principles of various existing gain ratio calibration methods and compares the advantages and disadvantages of the+45°method,±45°method,△45°method,rotation fitting method and pseudo-depolarizer method in practice though experiments.Results show that:the △45°method,±45°method and rotation fitting method are relatively accurate when the misalignment angle is small,but the operation of the±45°method and rotation fitting method are more complicated.The+45°method still has a large calibration error without a misalignment angle.The pseudo-depolarizer method is the easiest to operate,but it is restricted by a non-ideal pseudo-depolarizer.Through comparison of theory and experiment,this paper provides a suggestion for the best choice of gain ratio calibration method.It is recommended that the±45°method be used for calibration with a half-wave plate,and the pseudo-depolarizer method be used for calibration with a high-precision depolarizer.

关 键 词：偏振激光雷达 增益比 定标 退偏比 

分 类 号：TP958.98[自动化与计算机技术]