Gas bubbles imaging is vital in various industries. A system using ultrasound based on the tomography concept can be used to visualize the characteristics of bubbly flow. The ultrasonic system can provide important information on gas bubbles flow in a vertical pipe. Initially mathematical modeling was carried out on the propagation of ultrasound in the system. The image reconstruction was performed based on projections collected by collectors placed at different angles around the object of interest. The tomographic system composed of sixteen 333 kHz sensors was tested with five different phantoms that represent bubbles and the experimental results showed that it can provide the locations of single and multiple gas bubbles in the pipe.

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