激励电极位于信号触点的第一和第二部分之间。
The actuation electrode is positioned between the first and second portions of the signal contact.
离散相介质的存在对激励电极和测量电极附近区域灵敏场的影响比较大，对管道中心区域的影响则比较小。
The effect in the vicinity of the exciting electrode and detecting electrode is greater than that of the center of the pipe.
最后还讨论了时域法测量电极阻抗的激励信号的选择、测量频率上、下极限和噪声影响等问题。
The problems about the selection of excitation signal, limits of measurement frequency and noise influence have been discussed.
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