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Simulation of Electrode for Dual-Modality Electrical Resistance Tomography and Ultrasonic Transmission Tomography for Imaging Two-Phase Liquid and Gas

Fazlul Rahman, Mohd Yunus and Ruzairi, Abdul Rahim and Leow, Pei Ling and Nor Muzakkir, Nor Ayob and Yasmin, Abdul Wahab and Suzanna, Ridzuan Aw and Anita, Ahmad and Nasarudin, Ahmad and Mohd Hafiz, Fazalul Rahiman (2015) Simulation of Electrode for Dual-Modality Electrical Resistance Tomography and Ultrasonic Transmission Tomography for Imaging Two-Phase Liquid and Gas. Jurnal Teknologi (Sciences and Engineering), 77 (17). pp. 55-61. ISSN 0127-9696 (print); 2180-3722 (online)

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Abstract

Accurate multiphase flow measurement of gas/liquid, liquid/solid and liquid/liquid flow is still challenging for researchers in process tomography. The reconstructed images are poor particularly in the center area because of ill-posed inverse problems and limited of measurements data. Dual-modality tomography has been introduced to overcome the problem by means each modality is sensitive to specific properties of materials to be imaged. This paper proposed combination of ultrasonic transmission tomography (UTT) and electrical resistance tomography (ERT) for imaging two phase gas/liquid. In the proposed combination, detection ability in the medium of interest improved because two different images in the same space can be obtained simultaneously. This paper presents 3D numerical modeling approach using COMSOL software for ERT excitation strategy and electrode pre-designed geometry. Electrical resistance tomography (ERT) can be implemented for gas/liquid flow if the liquid is conductive. The objectives of this work is to analyze the optimum electrode dimension and shape in order to improve the situation of: (1) gas bubble detection located in the centre of the medium, (2) potential distribution and current density in a conductive medium, the developed numerical model simulated the changes in resistivity of the conductive material, with variations of electrode sizes, with opposite current excitation implemented into the region of interest. Simulation results show that the electrode size of 12 mm (w) × 40 mm (h) is suitable, which gives a good detection of center gas bubble with diameter 10mm in 100-mm-diameter acrylic vessel. Finally the findings are verified with Image reconstruction using Linear Back Projection (LBP) which gives good indication of the 10mm gas bubble.

Item Type: Article
Uncontrolled Keywords: Dual-modality tomography, Electrical resistance tomography, ultrasonic tomography, opposite excitation, time-of-flight (toF)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculty/Division: Faculty of Electrical & Electronic Engineering
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 07 Mar 2016 01:38
Last Modified: 14 Feb 2018 01:47
URI: http://umpir.ump.edu.my/id/eprint/11805
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