【摘要】：溫度是描述大氣狀態(tài)的基本參量之一,大氣溫度廓線的實時探測,對于研究太陽輻射、解釋地球氣溫變暖、提高天氣預(yù)報準確度具有重要的意義。激光雷達作為一種主動遙感探測工具,可以實現(xiàn)高時間和高空間分辨率的大氣溫度的探測。依據(jù)瑞利散射譜寬與溫度的依存關(guān)系實現(xiàn)大氣溫度探測的高光譜瑞利激光雷達得到廣泛應(yīng)用。針對目前常用的532nm和355nm的高光譜瑞利測溫激光雷達(HSRL),因為白天受到太陽背景光的影響,限制了它全天時的測量。本論文提出紫外波長266nm作為HSRL系統(tǒng)的激勵波長實現(xiàn)大氣溫度的探測。266nm波長的分子散射強度較強、譜寬較寬,重要的是處于日盲波段,白天探測不受太陽背景光影響。系統(tǒng)采用三個法布里-珀羅標準具(FPE)作為核心分光器件,根據(jù)散射信號特點優(yōu)化設(shè)計了三個濾波器的參數(shù),使三個FPE分別位于距離激光中心頻率OGHz、1.4GHz和3.5Ghz處,對于兩個瑞利通道都能實現(xiàn)-87dB的米散射抑制和大于1 %的瑞利透過率。根據(jù)設(shè)計的高光譜瑞利測溫激光雷達系統(tǒng)參數(shù),利用標準大氣模型對系統(tǒng)進行仿真,由于266nm波長處于臭氧吸收譜內(nèi),考慮近地面少量臭氧吸收和系統(tǒng)主要參數(shù)對探測結(jié)果的影響,結(jié)果表明,在白天,溫度探測誤差在3.2km以下小于1K;在夜間,溫度探測誤差在5.0km以下小于1K,仿真結(jié)果驗證了系統(tǒng)的可行性。研究表明對紫外波段266nm高光譜瑞利測溫激光雷達系統(tǒng)的研究可以實現(xiàn)全天時大氣溫度的探測,為大氣溫度探測提供了一種可行的探測方法。
[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.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN958.98

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