Mei Liang, Kong Zheng, Guan Peng
Opt Express. 2018 Mar 19;26(6):A260-A274. doi: 10.1364/OE.26.00A260.
A violet Scheimpflug lidar system employing a 1-W 407-nm multimode laser diode is developed for remote sensing of atmospheric aerosols. The laser beam of the laser diode that is transmitted into atmosphere has been investigated in detail and a cylindrical lens pair is designed to improve the geometrical transmission efficiency. A measurement scheme with automatic exposure as well as a generalized signal processing method are established to optimize the signal-to-noise ratio of lidar signals. The performance of the violet Scheimpflug lidar system has been evaluated during a six-day continuous measurement campaign on a near horizontal path. The maximum measurement distance can reach up to 7 km in sunny clean weathers and to about 2 km during haze with an aerosol extinction coefficient of about 0.9 km. The aerosol extinction coefficient retrieved by the Fernald method is promising and shows good correlation with particle concentrations measured by a local national pollution monitoring station. This work promotes the development of all-time Scheimpflug lidar systems operating at other wavelengths or multiple wavelengths for various atmospheric applications.
开发了一种采用1瓦407纳米多模激光二极管的紫光施密特棱镜激光雷达系统，用于大气气溶胶的遥感探测。已对传输到大气中的激光二极管的激光束进行了详细研究，并设计了一对柱面透镜以提高几何传输效率。建立了具有自动曝光功能的测量方案以及广义信号处理方法，以优化激光雷达信号的信噪比。在近水平路径上进行的为期六天的连续测量活动中，对紫光施密特棱镜激光雷达系统的性能进行了评估。在晴朗洁净天气下，最大测量距离可达7公里，在雾霾天气且气溶胶消光系数约为0.9公里时，测量距离约为2公里。用费尔纳德方法反演得到的气溶胶消光系数很有前景，并且与当地国家污染监测站测量的颗粒物浓度显示出良好的相关性。这项工作推动了用于各种大气应用的、工作在其他波长或多波长的全天候施密特棱镜激光雷达系统的发展。
