Jiangtao Sun and Wuqiang Yang
3D problem, electrical tomography, sensor design
Electrical tomography (ET) has been developed for over three decades and found a wide range of industrial applications. ET is used to visualise and measure the distribution of materials with different electrical or magnetic properties in a cross section of interest using a proper sensor. There are three modalities of ET: Electrical Capacitance Tomography (ECT), Electrical Resistance Tomography (ERT) and Electro-magnetic Tomography (EMT), with similar sensing principles but for different applications. While enormous papers have been published for ET system design, few of them have discussed the 3D issues of ET sensors, also referred to as the fringe effect. This paper will discuss these issues in ECT and ERT sensors, and present analytical and simulation results to illustrate the problems, and discuss possible solutions to reducing the fringe effect. In the end of the paper future research is suggested.
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