Pal S R, Carswell A I
Appl Opt. 1973 Jul 1;12(7):1530-5. doi: 10.1364/AO.12.001530.
The polarization properties of the backscattering of a lidar pulse from atmospheric clouds have been measured. A linearly polarized signal from a ruby laser at 694.3 nm is transmitted, and the scattering is simultaneously measured on a three-channel receiver that has polarizers oriented parallel, perpendicular, and at 45 degrees to the transmitted polarization. Substantial depolarizations (up to 0.5) are observed, and from the spatial variation of this depolarization the contribution of multiple scattering can be deduced.A wide variation in polarization properties is observed in different cloud types, and the results indicate that polarization signatures could be useful for cloud characterization and classification.
已测量了激光雷达脉冲从大气云层后向散射的偏振特性。发射一个来自694.3纳米红宝石激光器的线偏振信号，并在一个三通道接收器上同时测量散射光，该接收器的偏振器分别与发射偏振方向平行、垂直以及成45度角。观测到了显著的退偏振（高达0.5），并且从这种退偏振的空间变化可以推断出多次散射的贡献。在不同云型中观测到偏振特性有很大变化，结果表明偏振特征可用于云的表征和分类。
