Vol. 150, No. 3, March 2013, pp. 97-105

Abstract: Tomography is a process of imaging parameters in industrial applications. It can be based on different sensing methods; ultrasound and electrical impedance sensing methods are both sensitive to the particular characteristics of a material. These imaging methods have been shown to be practical instruments for process monitoring in the process industry. However the achieved image can be low in quality and restricted in resolution due to ill-posedness of the inverse problems and limited data. To further enhance the spectral images, this paper proposed combination of ultrasound transmission tomography (UTT) and electrical resistance tomography (ERT) to monitor a static two-phase liquid and gas. This paper presents the modeling approach for three dimensional (3D) geometries with linear finite element method (FEM) using COMSOL multiphysics. The modeling approach is aimed to determine the ability of dual-modality system in detecting bubbles with different sizes located at the center medium in acrylic vessel. Simulation results showed that the dual-modality system has the potential and can be implemented as alternative technique to visualize bubble with minimum radius of 5 mm located at center of the acrylic vessel.

Keywords: Electrical resistance tomography, Ultrasonic tomography, Opposite excitation, Acoustics impedance, Time-of flight, Bubble

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