進階時域反射訊號分析法於介電頻譜之便捷量測

Advanced Time Domain Reflectometry Analyses for Flexible Dielectric Spectroscopy

魏殷哲(Ngui, Yin Jeh)

指導教授 ： 林志平

國立交通大學/工學院/土木工程系所/博士(2019年)

摘要

寬頻介電頻譜量測方法對於解析材料之複介電電學特性扮演一強而有力之工具。介電頻譜能透露材料在電磁場中之能量儲存與消散行為，藉此深入了解材料之內涵介電特性與其潛在應用。多數介電頻譜量測技術的量測過程耗時、繁雜、昂貴與需繁瑣之系統標定方能達到標的，更甚者則需要特殊設計之感測器、準確的波形輸出訊號以及複雜之反算模型。現有文獻提出之數種全波形反算技術在萃取複介電頻譜時需要耗時之標定過程以及預先知道輸入波形函數。種種量測前置作業、後端訊號處理以及精密儀器於現地無法穩定操作的緣故，導致現地介電頻譜量測作業難度加深而降低了其施作可行性。本研究藉此契機提出四種進階時域反射 (Time domain reflectometry, TDR) 訊號分析法以量測10 MHz至1 GHz之介電頻譜，且兼具快速、簡單、無需反算模型和輸入波形函數之之優點。此四種分析法分別為相位速度分析法(PVA)、雙重反射分析法 (DRA)、多重反射分析法(MRA)、具阻抗塊之多重反射分析法(MRAIB)，其中首個分析法和後三者分別量測視介電頻譜與複介電頻譜。本研究建立所有分析法之理論框架後，再輔以模擬和實驗取得之TDR訊號進行方法探討與驗證。此四種分析演算法經數值模擬和實驗驗證證實只需簡易系統標定即可有效提供可靠的介電頻譜量測。各分析法皆透過系統參數探討深入了解影響因子與潛在限制，藉以了解並定位其適用之量測情境。本研究最後探討MRAIB分析法應用於微型感測器製程、高導電度量測環境與土壤介電頻譜量測上之可行性，進而評估其在野外實施時之潛在議題。後續建議利用本研究提出之演算法來建立土壤和其他材質之“介電指紋”資料庫，藉以啟發和完善我們對材料介電行為的了解和其與其他物理特性之聯結。

關鍵字

時域反射法(TDR) ； 介電頻譜量測 ； 相位速度分析法(PVA) ； 雙重反射分析法(DRA) ； 多重反射分析法(MRA)

並列摘要

are proven capable of extracting the embedded dielectric spectrum by fully utilizing TDR signals with minimal calibration effort. Parametric studies and method limitations are also further elaborate for each method to determine their appropriate implementation strategy. Application of MRAIB regarding the feasibility of probe miniaturization, field dielectric spectroscopy in high salinity or high electrical conductivity environment and soil dielectric spectroscopy are investigated in this study, in order to evaluate potential issues during the realization of field dielectric spectroscopy. Further efforts on
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constructing the dielectric fingerprint database of soil and other entities are recommended to be pursued using the proposed algorithms in order to inspire and complete our comprehensive understanding of underlying dielectric behaviors.

並列關鍵字

Time domain reflectometry (TDR) ； Phase velocity analysis (PVA) ； Dual reflection analysis (DRA) ； Multiple reflection analysis (MRA) ； MRA with impedance block (MRAIB)

參考文獻

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[2] F. Kremer and A. Schönhals, Broadband Dielectric Spectroscopy. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003.

[3] J. Y. Fu, “On the theory of the universal dielectric relaxation,” Philosophical Magazine, vol. 94, no. 16, pp. 1788–1815, Jun. 2014.

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[5] M. Dobson, F. Ulaby, M. Hallikainen, and M. El-rayes, “Microwave Dielectric Behavior of Wet Soil-Part II: Dielectric Mixing Models,” IEEE Transactions on Geoscience and Remote Sensing, vol. GE-23, no. 1, pp. 35–46, Jan. 1985.