Field Verification of Vehicle-Mounted All-Fiber Coherent Wind Measurement Lidar Based on Four-Beam Vertical Azimuth Display Scanning

Remote. Sens. Pub Date : 2023-07-01 DOI:10.3390/rs15133377
Xiaojie Zhang, Qingsong Li, Yujie Wang, Jing Fang, Yuefeng Zhao
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Abstract

Wind parameters play a vital role in studying atmospheric dynamics and climate change. In this study, a vehicle-mounted coherent wind measurement Lidar (CWML) with a wavelength of 1.55 µm is demonstrated based on a four-beam vertical azimuth display (VAD) scanning mode, and a method to estimate wind vector from power spectrum is proposed. The feasibility of the application of wind profile Lidar in vehicles is verified by calibration tests, comparison experiments, and continuous observation experiments, successively. The effective detection height of Lidar can reach 3 km. In contrasting experiments, the correlation coefficients of the magnitude and direction of horizontal wind speed measured by vehicle-mounted Lidar and fixed Lidar are 0.94 and 0.91, respectively. The experimental results reveal that the accuracies of wind speed and direction measurements with the vehicle-mounted CWML are better than 0.58 m/s and 4.20°, respectively. Furthermore, to understand the role of the wind field in the process of energy and material transport further, a proton-transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS) is utilized to measure the concentration of volatile organic compounds (VOCs). Relevant experimental results indicate that the local meteorological conditions, including wind speed and humidity, influence the VOC concentrations.
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基于四波束垂直方位显示扫描的车载全光纤相干风测量激光雷达的现场验证
风参数在研究大气动力学和气候变化中起着至关重要的作用。基于四波束垂直方位显示(VAD)扫描模式,研制了波长为1.55µm的车载相干风测量激光雷达(CWML),并提出了一种基于功率谱估计风矢量的方法。通过标定试验、对比实验和连续观测实验,验证了风廓线激光雷达在车载应用的可行性。激光雷达的有效探测高度可达3公里。在对比实验中,车载激光雷达和固定激光雷达测得的水平风速量级和方向的相关系数分别为0.94和0.91。实验结果表明,车载CWML测量风速和风向的精度分别优于0.58 m/s和4.20°。此外,为了进一步了解风场在能量和物质输运过程中的作用,利用质子转移反应飞行时间质谱仪(PTR-TOF-MS)测量挥发性有机化合物(VOCs)的浓度。相关实验结果表明,当地气象条件(风速和湿度)对VOC浓度有影响。
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