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首页> 外文期刊>Applied optics >Polarization-discrimination technique to maximize the lidar signal-to-noise ratio for daylight operations
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Polarization-discrimination technique to maximize the lidar signal-to-noise ratio for daylight operations

机译：偏振辨别技术可最大化日光操作中激光雷达的信噪比

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摘要

The impact and potential of a polarization-selection technique to reduce the sky background signal for linearly polarized monostatic elastic backscatter lidar measurements are examined. Taking advantage of naturally occurring polarization properties in scattered skylight, we devised a polarization-discrimination technique in which both the lidar transmitter and the receiver track and minimize detected sky background noise while maintaining maximum lidar signal throughput. Lidar elastic backscatter measurements, carried out continuously during daylight hours at 532 nm, show as much as a factor of 10~(1/2) improvement in the signal-to-noise ratio (SNR) over conventional unpolarized schemes. For vertically pointing lidars, the largest improvements are limited to the early morning and late afternoon hours, while for lidars scanning azimuthally and in elevation at angles other than vertical, significant improvements are achievable over more extended time periods with the specific times and improvement factors depending on the specific angle between the lidar and the solar axes. The resulting diurnal variations in SNR improvement sometimes show an asymmetry with the solar angle that analysis indicates can be attributed to changes in observed relative humidity that modifies the underlying aerosol microphysics and observed optical depth.
机译：考察了极化选择技术为线性极化的单静态弹性后向散射激光雷达测量而减少天空背景信号的影响和潜力。利用散射天光中自然发生的极化特性，我们设计了一种极化鉴别技术，其中激光雷达发射器和接收器都跟踪并最小化检测到的天空背景噪声，同时保持最大的激光雷达信号吞吐量。在白天，在532 nm处连续进行的激光雷达弹性背向散射测量表明，与传统的非偏振方案相比，信噪比（SNR）改善了近10到（1/2）倍。对于垂直指向的激光雷达，最大的改进仅限于清晨和下午晚些时候，而对于激光雷达进行方位角扫描并以垂直角度以外的其他角度进行仰角扫描，则可以在更长的时间内实现明显的改进，具体时间和改进因素取决于激光雷达和太阳轴之间的特定角度信噪比改善带来的日变化有时显示出与太阳角不对称，分析表明这可以归因于观测到的相对湿度的变化，从而改变了潜在的气溶胶微观物理特性和观测到的光学深度。

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