International Society for Industrial Process Tomography

Experimental Study of Complex-valued ECT

Maomao Zhang^1*, Yi Li¹ and Manuchehr Soleimani²

¹ Graduate School at Shenzhen, Tsinghua University (Tsinghua Campus, The University Town, Shenzhen, China)

² University of Bath (Claverton Down, Bath, United Kingdom)

^*Email: zhangmaomao@sz.tsinghua.edu.cn

ABSTRACT

Electrical complex capacitance tomography is considered using a set of complex-value capacitance measurement to image both conductivity and permittivity contrasts. The forward model calculates impedance between electrodes mounted outside of a dielectric pipe, which holds conductive materials. A novel reconstruction method for ECT is presented in this paper, where both the permittivity and the conductivity distribution of an object are reconstructed. Experiments based on the measurements from impedance analyser were carried out to verify the complex-value model and inverse solver. Consequently, it is found that the distribution of imaginary part of permittivity, i.e., conductivity can be imaged very well, and higher excitation frequency will allow better imaging in conductive backgrounds.This will be especially important for the higher value of conductivity water background or high water content in multiphase flow problems where currently ECT fails to work.

Keywords Complex-valued Capacitance Measurement, Electrical Capacitance Tomography, Multiple Frequency Measurement;

Industrial Application: General.