title: Multiphase permittivity imaging using absolute value electrical capacitance tomography data and a level set algorithm.
abstract: Multiphase flow imaging is a very challenging and critical topic in industrial process tomography. In this article, simulation and experimental results of reconstructing the permittivity profile of multiphase material from data collected in electrical capacitance tomography (ECT) are presented. A multiphase narrowband level set algorithm is developed to reconstruct the interfaces between three- or four-phase permittivity values. The level set algorithm is capable of imaging multiphase permittivity by using one set of ECT measurement data, so-called absolute value ECT reconstruction, and this is tested with high-contrast and low-contrast multiphase data. Simulation and experimental results showed the superiority of this algorithm over classical pixel-based image reconstruction methods. The multiphase level set algorithm and absolute ECT reconstruction are presented for the first time, to the best of our knowledge, in this paper and critically evaluated. This article is part of the themed issue 'Supersensing through industrial process tomography'.
authors.affiliation: Engineering Tomography Laboratory (ETL), Department of Electronic and Electrical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK.
authors.forename: E
authors.identifier: http://orcid.org/0000-0003-2820-7903
authors.initials: E
authors.lastname: Al Hosani
authors.affiliation: Engineering Tomography Laboratory (ETL), Department of Electronic and Electrical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK m.soleimani@bath.ac.uk.
authors.forename: M
authors.identifier: http://orcid.org/0000-0002-6341-9592
authors.initials: M
authors.lastname: Soleimani
keywords: absolute capacitance data; electrical capacitance tomography; multiphase flow imaging; multiple level set reconstruction