An introduction of two differential excitation potentials technique in electrical capacitance tomography

Mohamad, Elmy Johana and Abdul Rahim, Ruzairi and Leow, Pei Ling and Fazalul Rahiman, Mohd Hafiz and Marwah@Omar, Omar Mohd Faizan and Nor Ayob, Nor Muzakkir (2012) An introduction of two differential excitation potentials technique in electrical capacitance tomography. Sensors and Actuators A: Physical, 180 . pp. 1-10. ISSN 0924-4247

[img]
Preview
PDF
1033Kb

Abstract

The investigation of this work is to analyse the sensitivity distributions using single and two differential excitation potentials techniques in order to improve the situation of: (I) non-uniform sensitivity distribution; (2) less sensitivity in the central area, and (3) non-linear change in the ECT(electrica1 capacitance - tomography) system. Forward modelling using COMSOL Multiphysics is developed in order to obtain an algorithm to quantify the image reconstruction. The forward model developed is to simulate the changes in capacitance between opposing electrodes and the permittivity of the dielectric material due to the increasing of the diameter of a higher permittivity insert when two differential excitation potentials were injected. The MATLAB simulation is used to obtain the sensitivity distribution inside the closed pipe from the sensor. By using the MATLAB software, the forward model conditions are placed on the image plane to estimate the results. Generated phantoms and measured values are presented. Simulation is verified using available experimental data through the existing system, sixteen-segmented ECT sensor electrodes. By using this technique, the linear relationship between the capacitances measured and the permittivity dramatically improved, and the sensitivity distribution for an opposing electrode pair was increased; thus giving a slight increase in the sensitivity distribution in a central area. Simulation and initial experimental results illustrate the capability of the technique presented.

Item Type:Article
Uncontrolled Keywords:electrical capacitance tomography; sensitivity distribution; excitation potentials; COMSOL multiphysics; MATLAB
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA1501-1820 Applied optics. Photonics
Divisions:Faculty of Electrical and Electronic Engineering > Department of Robotic and Mechatronic Engineering
ID Code:7926
Deposited By:Normajihan Abd. Rahman
Deposited On:11 May 2016 17:58
Last Modified:11 May 2016 17:58

Repository Staff Only: item control page