Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/16236
標題: Application of Time Domain Reflectometry to Quantify Values of TDR Coaxial Cable Waveform
應用時域反射技術於同軸電纜波形數值量化之研究
作者: Lin, Yu-Shu
林育樞
關鍵字: TDR
時域反射技術
Landslide
Waveform Quantization
地滑
波形量化
出版社: 土木工程學系所
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摘要: Time Domain Reflectometry (TDR) can be used to measure the characteristic impedance of coaxial cable mainly by monitoring the process where the change of media causes the electromagnetic wave to refract and reflect. In such cases, discontinuous positions and characteristic impedance in the communication path are detected, and the TDR cable serves as a continuous, multiple-point monitoring sensor, not limited by its installing direction. When using TDR, a high relevance between the deformation pattern and the reflected waveform of the coaxial cable both in the laboratory and in landslide sites is observed. Analyzing results of the waveform in site and quantification statistics of laboratory tests helps us find the landslide pattern and displacement size. Thus, TDR facilitates the task of landslide monitoring and warning. In this study, the impacts different shear surface and shear band width displacements have on reflection signals are discussed mainly in two parts According to all test analysis items and result discussions, the following conclusions are reached: 1. When there are several sliding surfaces in simulated sites, the waveforms of shear surfaces of different locations and sizes in the same cable are highly related when quantified by the Area Method. Quantitative results of laboratory tests are indicative of the size of landslide in site. 2. Findings on the relationship between cable displacement and waveform of shear bands with different widths: different widths of the shear bands change the shear patterns of the cable and the reflection waveform. When a shear band is wider in width, the range of the shear is greater. 3. Special waveforms in site are looked at more closely in simulating tests using coaxial cable CTLLCX7/8” CFC. The close relationship of laboratory tests and field waveforms shows that CTLLCX7/8” CFC has good achievements in shear deformation test.
時域反射技術 (TDR) 可用於量測同軸電纜線的特性阻抗,主要是利用電磁波在行進間所遭遇介質改變產生折射或反射的現象來做量測,找出傳輸路徑中的不連續位置和特性阻抗。而所埋設的同軸電纜線皆為一連續、可多點量測的感應器,不受設置方向的限制。 時域反射技術於室內試驗方面,對於同軸電纜線的變形型式和反射波形也得到一定程度的相關性,設置於地滑地現場的纜線也有不錯的成效。分析現地截取之波形與室內試驗量化的結果,可了解到地層滑動的形式和位移大小,對地滑監測和預警方面有不錯的功效。 本研究主要的內容分為兩個部份,利用數個不同變位量的剪動面和不同寬度大小的剪動帶來探討其對反射訊號的影響,根據室內試驗模擬所得到的結果來分析,結論簡述如下: 1、模擬現地同時有數個滑動面存在時,同一纜線中,不同位置和大小的剪動面,其波形以面積法量化後可得一良好關係,以室內試驗剪動量量化結果可了解現地地層滑動量的大小。 2、不同寬度大小的剪動帶來探討對纜線變位的關係,剪動帶的大小會造成纜線的剪動形式和反射波形的改變,當剪動帶的寬度越大時剪動量也相對較大。 3、就本研究所採用的同軸電纜線CTLLCX 7/8〞CFC進行室內模擬試驗,針對現地較特殊之波形加以探討,比較試驗成果與現地波形的關係,CTLLCX 7/8〞CFC在剪動變形試驗中有不錯的成效。
URI: http://hdl.handle.net/11455/16236
其他識別: U0005-1808201018333200
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1808201018333200
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