Correction technology of a polarization lidar with a complex optical system.
Correction technology of a polarization lidar with a complex optical system.
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DOI：
10.1364/josaa.33.001488
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发表时间：
2016-08
期刊：
影响因子：
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通讯作者：
Huige Di;Hangbo Hua;Yan Cui;Dengxin Hua;Bo Li;Yuehui Song
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文献类型：
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作者：
Huige Di;Hangbo Hua;Yan Cui;Dengxin Hua;Bo Li;Yuehui Song
在偏振激光雷达中使用的复杂光学系统经常修改返回信号的输入偏振，使得其可能显著影响去偏振估计并将误差引入偏振激光雷达测量。在大多数情况下，延迟，去偏振，和系统的失调同时存在，并相互作用。系统的偏振效应不能用简单的校正系数来表示，因此不能使用传统的校准方法来去除它们。针对偏振激光雷达中多个光学元件对去偏振值估计的系统偏差，提出了详细的分析和校正技术。计算了从发射端到接收端的Mueller矩阵，推导并得到了考虑系统偏振效应的气溶胶退偏振参数表达式。此外，介绍并给出了基于Mueller矩阵的校正算法。建立了一台偏振激光雷达，利用实验室椭偏仪测量了其光学元件的偏振特性，并计算得到了接收机的Mueller矩阵。进行了激光雷达观测，我们的校正算法应用于激光雷达场数据。结果表明，该校正方法可以有效地消除系统偏振效应。
A complex optical system used in polarization lidars often modifies the input polarization of the return signal so that it may significantly impact depolarization estimates and introduce errors to polarization lidar measurements. In most cases, retardation, depolarization, and misalignment of the system exist at the same time and interact with each other. Polarization effects of the system cannot be represented by a simple correction coefficient, so they cannot be removed using a traditional calibration method. Detailed analysis and correction technologies were provided to remove systematic biases in estimating depolarization values from a polarization lidar owing to multiple optical components. The Mueller matrices from an emitter to a receiver were calculated, and the expression for an aerosol depolarization parameter including system polarization effects was derived and obtained. In addition, the correction algorithm based on the Mueller matrix was introduced and provided. A polarization lidar was established, and the polarization characteristics of its optical components were measured with a laboratory ellipsometer; then, the Mueller matrix of the receiver was calculated and obtained. Lidar observations were performed, and our correction algorithm was applied to lidar field data. The results show that the correction method can significantly remove systematic polarization effects.