大氣導電率受到離子濃度、遷移率等因素影響，在不同時間、高度、溫度與濕度條件，以及不同大氣組成成分的環境中會隨之變化。此外，於2011、2014年由郭政靈博士等人所提出的模型中，指出地震前兆可能導致地表導電率發生變化。本論文將發展高時間解析度的導電率量測儀器，可用於觀察導電率變化以及擾動因素。
　　於本論文中發展了電流型吉爾定電容器(Gerdien condenser)作為導電率量測儀器，並且提高時間解析度，以及重新設計電子電路以提升訊噪比，同時改善機械結構以降低溢漏電流與靜電附著對於量測之影響。
　　經由負離子產生器與真空乾燥箱進行測試與驗證後，吉爾定電容器可有效量測於不同離子濃度下之導電率變化，並移至戶外進行兩次長時間的導電率現地量測。分別觀察到導電率上升時，細懸浮微粒PM2.5與PM10之濃度也有上升的趨勢。以及導電率可能具有日週期變化：在上午10點時，導電率達到一天當中的最大值，並持續降低至下午三點的最低值。

　　　　The atmospheric conductivity varies with time, height, humidity and composed of the environment. In addition, an ionosphere-atmosphere-lithosphere coupling model proposed by Kuo et al. [2011, 2014] pointed out that the precursors of earthquake may also result a change of the conductivity at ground. The goal of this work is to design a Gerdien condenser with a high temporal resolution to observe the conductivity variation and its associations. Furthermore, the long-term in-situ conductivity monitoring can understand the circulation of the electric charges above the Earth's surface and the global electric circuit.
In this work, the circuit of the Gerdien condenser was redesigned, and the mechanical structure was enhanced to reduce the leakage current effectively and to solve the problem of the static charges adherence to the outer electrode. After the verification, this instrument can measure the variation of the conductivity at different ion concentrations effectively. Two experiments were carried out, and the variation of the conductivity associated with the PM2.5 and PM10 was observed, furthermore, the diurnal variation of the conductivity is also noted.

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