日盲波段全天时高光谱瑞利测温激光雷达系统设计与仿真

发布时间：2019-06-07 20:35

【摘要】：温度是描述大气状态的基本参量之一,大气温度廓线的实时探测,对于研究太阳辐射、解释地球气温变暖、提高天气预报准确度具有重要的意义。激光雷达作为一种主动遥感探测工具,可以实现高时间和高空间分辨率的大气温度的探测。依据瑞利散射谱宽与温度的依存关系实现大气温度探测的高光谱瑞利激光雷达得到广泛应用。针对目前常用的532nm和355nm的高光谱瑞利测温激光雷达(HSRL),因为白天受到太阳背景光的影响,限制了它全天时的测量。本论文提出紫外波长266nm作为HSRL系统的激励波长实现大气温度的探测。266nm波长的分子散射强度较强、谱宽较宽,重要的是处于日盲波段,白天探测不受太阳背景光影响。系统采用三个法布里-珀罗标准具(FPE)作为核心分光器件,根据散射信号特点优化设计了三个滤波器的参数,使三个FPE分别位于距离激光中心频率OGHz、1.4GHz和3.5Ghz处,对于两个瑞利通道都能实现-87dB的米散射抑制和大于1 %的瑞利透过率。根据设计的高光谱瑞利测温激光雷达系统参数,利用标准大气模型对系统进行仿真,由于266nm波长处于臭氧吸收谱内,考虑近地面少量臭氧吸收和系统主要参数对探测结果的影响,结果表明,在白天,温度探测误差在3.2km以下小于1K;在夜间,温度探测误差在5.0km以下小于1K,仿真结果验证了系统的可行性。研究表明对紫外波段266nm高光谱瑞利测温激光雷达系统的研究可以实现全天时大气温度的探测,为大气温度探测提供了一种可行的探测方法。
[Abstract]:Temperature is one of the basic parameters to describe the atmospheric state. The real-time detection of atmospheric temperature profile is of great significance for the study of solar radiation, the explanation of earth temperature warming and the improvement of weather prediction accuracy. As an active remote sensing detection tool, lidar can detect atmospheric temperature with high time and high altitude resolution. Based on the dependence of Rayleigh scattering spectrum width and temperature, hyperspectral Rayleigh lidar for atmospheric temperature detection has been widely used. The hyperspectral Riley temperature measurement lidar (HSRL), which is commonly used in 532nm and 355nm, limits its all-day measurement because it is affected by solar background light during the day. In this paper, UV wavelength 266nm is proposed as the excitation wavelength of HSRL system to detect atmospheric temperature. The molecular scattering intensity of 266 nm wavelength is strong, the spectrum width is wide, the important thing is that it is in the solar blind band, and the detection is not affected by the solar background light during the day. The system uses three Fabry-Perot standard (FPE) as the core splitter, and optimizes the parameters of the three filters according to the characteristics of the scattering signal, so that the three FPE are located at the distance laser center frequency OGHz,1.4GHz and 3.5Ghz, respectively. For both Riley channels, the meter scattering suppression of 87dB and the Reilly transmittance of more than 1% can be realized. According to the parameters of the designed hyperspectral Riley temperature measurement lidar system, the standard atmospheric model is used to simulate the system, because the 266nm wavelength is in the ozone absorption spectrum. Considering the influence of a small amount of ozone absorption near the ground and the main parameters of the system on the detection results, the results show that the temperature detection error is less than 1K below 3.2km during the day. At night, the temperature detection error is less than 1 K below 5.0km, and the simulation results verify the feasibility of the system. The results show that the study of ultraviolet band 266nm hyperspectral Riley temperature measurement lidar system can realize the detection of atmospheric temperature throughout the day, which provides a feasible detection method for atmospheric temperature detection.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN958.98

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