单波长发射五通道接收激光雷达系统研制

发布时间：2019-04-19 03:33

【摘要】：后向散射激光雷达是探测大气气溶胶参数的有力工具,但它存在盲区和过渡区,且需要假设气溶胶的消光后向散射系数比来反演气溶胶的参数,这些限制了它的探测范围和精度。集侧向散射、后向散射和拉曼散射于一体的单波长发射五通道接收激光雷达系统,克服了上述困难。该激光雷达可以探测气溶胶的退偏比廓线、水汽混合比廓线、后向散射系数廓线和消光系数廓线等。气溶胶后向散射系数和消光系数可从地面到对流层顶进行探测,气溶胶退偏比廓线可以在对流层内进行探测,水汽混合比廓线可以在边界层内进行探测。在硬件条件的基础上,分析了各通道的信噪比和探测结果的随机相对误差。实例探测表明:该激光雷达系统数据可靠,探测范围较广。该系统的建立,为进一步深入研究气溶胶消光系数、水汽时空分布以及它们之间相互关系奠定了坚实的实验基础。
[Abstract]:Backscatter lidar is a powerful tool for detecting atmospheric aerosol parameters, but it has blind and transitional regions, and it is necessary to assume the extinction backscattering coefficient ratio of aerosol to invert aerosol parameters. These limit its detection range and accuracy. A single-wavelength transmitting five-channel Lidar system, which integrates lateral scattering, backward scattering and Raman scattering, overcomes the above-mentioned difficulties. The Lidar can detect the profile of aerosol depolarization ratio, water vapor mixing profile, backscattering coefficient profile and extinction coefficient profile, etc. The aerosol backscattering coefficient and extinction coefficient can be detected from the ground to the troposphere. The aerosol depolarization profile can be detected in the troposphere and the water vapor mixing profile can be detected in the boundary layer. On the basis of hardware conditions, the signal-to-noise ratio (SNR) of each channel and the random relative error of the detection results are analyzed. An example shows that the Lidar system is reliable in data and has a wide range of detection. The establishment of the system provides a solid experimental basis for further study of aerosol extinction coefficient, spatial and temporal distribution of water vapor and their relationship.
【作者单位】：陆军军官学院基础部物理教研室;陆军军官学院偏振光成像探测技术安徽省重点实验室;中国科学院安徽光学精密机械研究所中国科学院大气光学重点实验室;中国科学技术大学;
【基金】：国家自然科学基金(41475025)
【分类号】：TN958.98

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