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International Society for Industrial Process Tomography

8th World Congress on Industrial Process Tomography

Feasibility Study of Frequency-difference Electrical Impedance Tomography on Industrial Applications

Hancong Wu, Yunjie Yang, Javier Escudero, Jiabin Jia

Agile Tomography Group, School of Engineering, University of Edinburgh The Kings Buildings, The Univerisity of Edinburgh, EH9 3JL, Edinburgh, UK


The common working procedure of Electrical Impedance Tomography (EIT) needs to take a reference measurement when the phantom is full of homogenous continuous phase, like water. However, in practical industrial operations, the conductivity of continuous phase always varies due to the effects of the changes of ambient and fluid temperature, ionic concentration, and internal energy conversion in a fluid. Sometimes it is impracticable for practical process to have a homogenous continuous phase in the phantom for the purpose of taking a new reference for EIT. In order to overcome the difficulties raised by the traditional EIT in industrial applications, the frequency-difference EIT (fdEIT) adopted in medical applications could be an alternative solution for this problem. In this approach, the characteristics difference of multiple materials at two different frequencies is used to reconstruct the tomographic image. In this paper, the principle of fdEIT is explained in the finite element simulation. The method of selecting two optimal frequencies is studied and the performance of fdEIT is verified on the experimental rig. The limitation of our system and the future improvements are discussed.

Keywords EIT, frequency-difference, frequency selection, industrial applications

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