本篇論文是基於利用單次轉頻自我注入鎖定雷達來偵測地面下的水管是否破裂，此架構可克服傳統連續波雷達架構之窠臼，同時具有高靈敏度與高穿透性的特性。整體系統操作流程為將自我注入鎖定振盪器的輸出訊號藉由頻率轉換器將5.8 GHz降頻至0.915 GHz後由天線發射，由於管線破裂會產生低頻振動並造成都普勒位移，在接收都普勒資訊後，此回波訊號回傳至接收端，升頻至注入鎖定振盪器之自由振盪頻率並重新注入，使其操作在自我注入鎖定狀態。為了驗證管線破裂會造成都普勒位移的現象，本論文使用COMSOL模擬管線破裂與無破裂的條件，在基於流固耦合的理論下，來取得此兩種條件的區別。而在訊號處理分析的部分，本論文使用訊號雜訊比做為依據，藉由量測當下環境無破裂管線的訊號雜訊比做為判斷洩漏的閥值，最後進行量測並與閥值比較即可得知管線是否有破裂的現象。

This thesis elaborates on the detection of underground pipe leakage based on single conversion self-injection locked radar, which is a system with high sensitivity and great penetrability, and it improves the defect of the traditional continuous-wave radar. The operating principle can describe as the following item: The first step is that 5.8 GHz output signal from the injection-locked oscillator will convert to 0.915 GHz through the frequency converter and radiated by the transmitter. Then, the transmission signal will influence by the lower frequency doppler information which is produced by the broken pipeline. Finally, the receiver will obtain the echo signal first and the frequency converter coverts it to 5.8 GHz so that the radar system can operate the self-injection-locked situation. Otherwise, we use COMSOL this software to simulate the normal and broken pipeline. Base on fluid-structure interaction theory, we can obtain the difference for above two status. On part of the signal processing and analysis, we employ signal-to-noise ratio as the reference of pipe leakage. It can determine the pipe leaks or not by setting the threshold which measures from the non-leak pipeline at the current environment.

論文審定書 i
論文公開授權書 ii
誌謝 iii
摘要 iii
Abstract v
目錄 vi
圖目錄 viii
表目錄 xi
第一章 序論 1
1.1 研究背景與方法 1
1.2 管線洩漏偵測技術 3
1.3 透地雷達感測洩漏文獻探討 11
1.4 論文架構 16
第二章 系統架構 17
2.1 自我注入鎖定理論介紹 17
2.1.1 注入模型與理論 17
2.1.2 自我注入鎖定理論 20
2.2 單次轉頻自我注入鎖定雷達系統 24
第三章 COMSOL軟體模擬 29
3.1 管路振動模式 29
3.2 軟體環境參數設置與模擬結果 31
第四章 實驗設計與量測 37
4.1 實驗環境設置 37
4.2 管線量測結果 40
4.2.1無破裂之管線量測結果 44
4.2.2 不同水平距離下之管線量測結果 45
4.2.3 不同管徑之管線量測結果 47
4.2.4 不同破裂孔直徑之管線量測結果 48
4.2.5 量測失敗範例 49
第五章 結論 53
參考文獻 54

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