光学学报, 2018, 38 (4): 0401005, 网络出版: 2018-07-10   

侧向散射激光雷达探测白天近地面气溶胶探测技术 下载: 1205次

Ground Layer Aerosol Detection Technology During Daytime Based on Side-Scattering Lidar
作者单位
1 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, 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230026
3 陆军炮兵防空兵学院基础部, 安徽 合肥 230031
4 安徽粮食工程职业学院信息技术系, 安徽 合肥 230011
5 中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031
摘要
基于CCD的侧向散射激光雷达不受几何因子的影响,是探测近地面气溶胶的有力工具。夜晚的探测技术已成熟,由于背景光中夜晚的月光和星光远弱于白天的太阳光,故利用夜晚探测技术得到的白天气溶胶信噪比很低。实验中选用窄带滤光片和小张角镜头,通过校正窄带滤光片透射率、缩短单次曝光时间、多次曝光平均等技术可有效提高白天探测气溶胶的信噪比。白天个例表明,侧向散射激光雷达与后向散射激光雷达反演的气溶胶后向散射系数廓线在0.75~1.50 km范围内的变化趋势一致,并对0.75 km以下侧向散射激光雷达探测的正确性进行了验证。对合肥地区近地面气溶胶后向散射系数进行了37 h的连续昼夜探测,并与同一地点的温度、PM2.5质量浓度联合进行分析。研究表明,改进后的白天侧向散射激光雷达技术是正确、可行的。
Abstract
Side-scattering lidar based on CCD, which is not affected by geometrical factors, is a powerful tool for ground layer aerosol detection. The detection technology at night is mature. Since moonlight and starlight in the background light are much weaker than the sunlight, the signal-to-noise ratio is very low when we detect ground layer aerosol during daytime using the detection technology used at night. In experiments, lens with a small field of view and a narrowband filter is selected. Meanwhile, correcting narrowband filter transmittance, reducing single exposure time, and multi-average-exposure are applied to improve signal-to-noise ratio effectively. The daytime case shows that the aerosol backscattering coefficient profile from side-scattering lidar is consistent with that from backscattering lidar in the range from 0.75 km to 1.5 km. The correctness of side-scattering lidar detection under 0.75 km is also verified. Continuous 37 h profiles of aerosol backscattering coefficient of Hefei near ground region are calculated, and the analysis combined with temperature and PM2.5 mass concentration is conduct. The results indicate that the improved side-scattering lidar detection technology is correct and feasible.

麻晓敏, 陶宗明, 张璐璐, 单会会, 张辉, 马明俊, 王申浩, 王英俭. 侧向散射激光雷达探测白天近地面气溶胶探测技术[J]. 光学学报, 2018, 38(4): 0401005. Xiaomin Ma, Zongming Tao, Lulu Zhang, Huihui Shan, Hui Zhang, Mingjun Ma, Shenhao Wang, Yingjian Wang. Ground Layer Aerosol Detection Technology During Daytime Based on Side-Scattering Lidar[J]. Acta Optica Sinica, 2018, 38(4): 0401005.

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