荧光-米偏振激光雷达系统定标

The calibration of a fluorescence-Mie polarization lidar system

空气质量问题已经成为目前最为关注的社会热点问题之一,米散射激光雷达由于具有时间和空间分辨能力而被广泛应用于该问题的研究。针对国内首台自行研制的355nm激发波长的荧光-米偏振激光雷达系统完成了定标,以有效提高气溶胶反演精度。定标包括对米偏振通道以及荧光通道和米通道的标定。用半波片法和分光片法设计了多组定标实验,得到了对应的通道相关系数,消除了系统各通道之间的偏差。定标结果表明米偏振通道的相关系数平均值为1.01,标准差不超过0.13,荧光和米通道相关系数平均值为1.13,标准差不超过0.04。

Air quality has become one of the most concerned social hot issues at present. Lidar is widely used to research this problem due to its temporal and spatial resolution capabilities. A calibration method for the first domestic self-developed fluorescence-Mie polarization lidar system of 355 nm is proposed and the retrieve precision of aerosols is improved effectively. The method includes calibration of the Mie polarization channels and the calibration of fluorescence and Mie channel. Several sets of calibration experiments were designed by the half-wave plate method and beam-splitter method to obtain the corresponding correlation coefficients and eliminate deviations between channels. The calibration results show that the correlation coefficient of the Mie polarization channel is 1.01, the standard deviation is less than 0.13, the average correlation coefficient of fluorescence and Mie channel is 1.13, and the standard deviation is less than 0.04.