Abstract
Electrical capacitance tomography (ECT) technology is a process tomography, which is based on medical CT technology and develops together with computer and sensor technology. The measured capacitances by ECT system are usually normalized at the high and low permittivity for image. Parallel normalization model is commonly used during normalization process, which assumes the distribution of materials in parallel. And thus, the normalized capacitance is a linear function of measured capacitance. The usage of series normalization model results in the normalized capacitance as a nonlinear function of measured capacitance. The research on parallel, series normalization model and hybrid normalization model. In this paper, we propose a method based on the center electric field line to determine the model weighting factor for the hybrid normalization model. The simulation and static test results show that the reconstructed image quality is improved obviously by the hybrid normalization model based on the center electric field line.
Highlights
Electrical capacitance tomography (ECT) is a nonintrusive and non-destructive image reconstruction technique in industrial processes for obtaining information about the contents of closed pipes or vessels by measuring variations in the dielectric property of material inside the vessel
The hybrid normalization model based on the center electric field line is applied to ECt image reconstruction, which improves the quality of image reconstruction
Simulation and results show that the normalized model provides a new method and approach for ECT image reconstruction
Summary
Electrical capacitance tomography (ECT) is a nonintrusive and non-destructive image reconstruction technique in industrial processes for obtaining information about the contents of closed pipes or vessels by measuring variations in the dielectric property of material inside the vessel. This technique determines the permittivity distribution using capacitance measurements obtained by applied voltages through the electrodes mounted on the periphery of the domain of interest. The combination of the various measurements between the electrodes can reflect the multi-phase fluid concentration and the distribution of the tube in the cross-section, the capacitance measurement as the projection data, through a certain image reconstruction algorithm. Where is V the potential difference between the source and detector electrode
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