The effect in the vicinity of the excitingelectrode and detecting electrode is greater than that of the center of the pipe.
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。
2
In this paper, the electrode structure and single electrode current exciting mode are deeply analyzed and optimized by the fundamental study of ERT technology.