Reexamination of depolarization in lidar measurements.
Reexamination of depolarization in lidar measurements.
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DOI：
10.1364/ao.47.003795
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发表时间：
2008-07
期刊：
影响因子：
1.9
通讯作者：
G. Gimmestad
中科院分区：
文献类型：
--
作者：
G. Gimmestad
激光雷达文献中几乎所有的去偏振论文都采用了物理上不合适的符号，并且他们使用的去偏振比的定义在感兴趣的量中不是线性的。这种去偏振激光雷达的传统是误导和混乱的。特别是，表示平行和垂直的下标不适用于大气参数，例如体积后向散射系数，因为（对于线偏振）后向散射光的两个分量在透射方向上偏振并且完全非偏振;非偏振分量不是“垂直的”。“最近在文献中提供的粒子散射矩阵的激光雷达去偏振测量的分析产生用于从线性或圆形去偏振激光雷达测量中检索去偏振参数的算法。这里推荐的分析、符号和定义使激光雷达去偏振分析与辐射传输理论、粒子散射理论和标准偏振测量技术相协调。
Almost all of the depolarization papers in the lidar literature employ a physically inappropriate notation and they use a definition of the depolarization ratio that is not linear in the quantity of interest. This depolarization lidar legacy is misleading and confusing. In particular, subscripts meaning parallel and perpendicular do not apply to atmospheric parameters, such as the volume backscatter coefficient, because (for linear polarization) the two components of the backscattered light are polarized in the transmitted sense and completely unpolarized; the unpolarized component is not "perpendicular." An analysis of lidar depolarization measurements with a particle scattering matrix recently provided in the literature yields algorithms for retrieving the depolarization parameter from either linear or circular depolarization lidar measurements. The analysis, notation, and definitions recommended here harmonize lidar depolarization analysis with radiative transfer theory, particle scattering theory, and standard polarization measurement techniques.