a method based on electrical capacitance tomography (ect) and an improved least squares support vector machine (ls-svm) is proposed for void fraction measurement of oil-gas two-phase flow. in the modeling stage, to solve the two problems in ls-svm, pruning skills are employed to make ls-svm sparse and robust; then the real-coded genetic algorithm is introduced to solve the difficult problem of ...

The two-phase flow widely exists in the nature and industrial processes. The measurement of two-phase flows, including gas/solids, gas/liquid and liquid/liquid flows, is still challenging. Fusions of electrical tomography with conventional sensors provide possibilities to improve two-phase flow accurate measurement. In this paper, fusions of (1) electrical resistance tomography (ERT) with elect...

Benefiting from the ability to image permittivity distribution of dielectric materials, electrical capacitance tomography (ECT) has been applied for multiphase flow metering decades as a contactless method. However, water-continuous brings challenges ECT since conductivity in water makes fail reconstruct distribution. Therefore, complex-valued (CV-ECT) is introduced both and based on measuremen...

Electrical Capacitance Tomography (ECT) can be used to measure concentration and velocity distributions in two-phase flows. ECT is non-intrusive, and the reconstruction of the concentration and velocity distribution can be undertaken in real time and over an arbitrary number of zones in the flow cross-section. The concept of a ‘virtual instrument’ is introduced where zones of the image can be s...

Electrical capacitance tomography (ECT) is used to obtain information about the distribution of a mixture of dielectric materials inside a vessel or pipe. ECT has several advantages over other reconstruction algorithms and has found many applications in the industrial fields. However, there are some difficulties with image reconstruction in ECT: The relationship between the permittivity distrib...

.To solve the ‘soft-field’ nature and the ill-posed problem in electrical capacitance tomography (ECT) technology, this paper first presents a preconditioned conjugate gradient iterative algorithm for electrical capacitance tomography (PCG), Then, the results of the PCG algorithm using PSO method for imaging gray scale compensation. Streszczenie. Artykuł przedstawia algorytm PCG (preconditioned...

This paper studies the defect detection problem of adhesive layer of thermal insulation materials. A novel detection method based on an improved particle swarm optimization (PSO) algorithm of Electrical Capacitance Tomography (ECT) is presented. Firstly, a least squares support vector machine is applied for data processing of measured capacitance values. Then, the improved PSO algorithm is prop...

This article investigates a rotational data collection strategy for planar array electrical capacitance tomography (ECT) to improve the imaging of complex-shaped objects in scenarios, where access object is limited. Planar ECT can produce 2-D and 3-D images changes dielectric permittivity object, but detecting may require more electrodes array, which decrease quality measurements make it challe...

Abstract Three-dimensional (3D) visualization has provoked interest in electrical capacitance tomography (ECT) due to recent progress the development of measurement circuits and data-acquisition systems. This paper proposes image reconstruction using spatio-temporal sampling Z -axis for 3D ECT improve spatial resolution. In a typical application ECT, multi-phase flow imaging is performed throug...

In this paper, the inverse problem of calculating the permittivity coefficient in electrical capacitance tomography (ECT) is considered based on the minimization of a special functional that depends on two regularization parameters. The calculation of the permittivity is an ill-posed problem difficult to solve. Firstly the theoretical analysis developed in [6] is reviewed. Then the basic concep...