臺灣博碩士論文加值系統

此篇論文概略分為兩個部分 :第一部份運用偏振雷射雷達技術對於卷雲微物理性質之研究。
第二部份則使用大氣密度Fit卷雲穿透率，重新校準求得Lidar ratio (extinction-to-backscatter ratio)。
因為Lidar ratio提供卷雲(cirrus clouds)的穿透和反射性質也反應出冰晶(ice-crystal)的特性 ,因為Lidar ratio與冰晶的形狀 ,大小 ,和各向異性的方向(orientation of the anisotropic)有關 ,以往粒子的消光(extinction)或背向散射(backscatter)係數是由解基本Lidar方程式而來如Klett所採取的extinction/backscatter ratio constraint method 可得到Lidar ratio 一般視為常數因此難免有些誤差，並且由Raman Lidar對背向散射和消光profiles的獨立量測，指出Lidar ratio 並不是與高度無關的常數，所以需依高度做修正。
因為卷雲的消光只對Raman訊號有影響，所以從Raman Lidar得到的消光係數是獲得正確卷雲消光profiles的唯一方法。但Raman訊號約比Rayleigh訊號小3∼4數量級，我們所能觀測到的最高距離約10公里，但這個高度並不是卷雲常出現的地方，所以我們以大氣密度Fit卷雲穿透率的方法重新求得Lidar ratio進而分析卷雲的微物理性質。

第一章：雷射遙測簡介 …………………………………………1
第二章：雷射雷達的基本理論 …………………………………4
2- 1：Lidar 工作原理 ………………………………………4
2- 2：Rayleigh 散射理論 ……………………………………5
2- 3：Lidar 方程式 …………………………………………10
2- 4：Lidar 方程的解 ………………………………………16
2- 5：散射的消偏振作用 …………………………………21
第三章：實驗裝置與測試 ………………………………………25
3- 1：儀器與裝置 …………………………………………25
3- 2：儀器測試與校正 ……………………………………27
第四章：卷雲微物理性質與觀測結果 …………………………37
4- 1：卷雲性質介紹 ………………………………………37
4- 2：卷雲的消偏振量測 …………………………………39
第五章：Lidar ratio ………………………………………………50
5- 1: 卷雲光學厚度與穿透率 ……………………………52
5- 2：Lidar ratio 與高度的關係 ……………………………60
5- 3：卷雲冰水含量(IWC)分佈 …………………………63
第六章：結論與未來發展 ……………………………………65
MATLAB程式 ……………………………………68
數據資料： ……………………………………………D
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