Gong Yu, Bu Lingbing, Yang Bin, Mustafa Farhan
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Key Laboratory of Meteorological Disasters, Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Nanjing Institute of Advanced Laser Technology, Nanjing 210038, China.
Sensors (Basel). 2020 Apr 14;20(8):2211. doi: 10.3390/s20082211.
Developments in mid-infrared Differential Absorption Lidar (DIAL), for gas remote sensing, have received a significant amount of research in recent years. In this paper, a high repetition rate tunable mid-infrared DIAL, mounted on a mobile platform, has been built for long range remote detection of gas plumes. The lidar uses a solid-state tunable optical parametric oscillator laser, which can emit laser pulse with repetition rate of 500 Hz and between the band from 2.5 μm to 4 μm. A monitoring channel has been used to record the laser energy in real-time and correct signals. Convolution correction technology has also been incorporated to choose the laser wavelengths. Taking NO and SO as examples, lidar system calibration experiment and open field observation experiment have been carried out. The observation results show that the minimum detection sensitivity of NO and SO can reach 0.07 mg/m, and 0.31 mg/m, respectively. The effective temporal resolution can reach second level for the high repetition rate of the laser, which demonstrates that the system can be used for the real-time remote sensing of atmospheric pollution gas.
近年来，用于气体遥感的中红外差分吸收激光雷达（DIAL）技术发展受到了大量研究。本文搭建了一个安装在移动平台上的高重复率可调谐中红外DIAL，用于远距离遥感探测气体羽流。该激光雷达采用固态可调谐光学参量振荡器激光器，能够发射重复频率为500Hz、波段在2.5μm至4μm之间的激光脉冲。使用了一个监测通道实时记录激光能量并校正信号。还采用了卷积校正技术来选择激光波长。以NO和SO为例，开展了激光雷达系统校准实验和野外观测实验。观测结果表明，NO和SO的最小探测灵敏度分别可达0.07mg/m³和0.31mg/m³。由于激光的高重复率，有效时间分辨率可达秒级，这表明该系统可用于大气污染气体的实时遥感监测。
