An Ultrasonic Transmission/Reflection Mode Tomography for Two- Phase Flow Measurement

The ultrasonic process tomography obtains the distribution of two-phase flows based on ultrasound propagation in different fluids, so it is valuable for industrial monitoring and measurement. It can do a non-intrusive exploration of the multi-phase flow hydrodynamics. This paper presents a dualmode ultrasonic process tomography that fuses reflection-mode tomography and time-of-flight ultrasonic tomography. In this method, a 32-digit array of ultrasonic sensors is used for flow measurement. The two-phase flow rate that involves liquid and gas phases is calculated by a simple algebraic algorithm with the data obtained from sensors. Simulation results reveal that the measurement technique is independent of the fluid flow pattern and the system error is also decreased. The contribution of the article is the introduction of a simple algebraic method for image reconstruction for which no special case is considered and simultaneously, the image reconstruction error is reduced. The relative error of the reconstructed images is presented by MATLAB simulation and it is much lower than the conventional methods. For a gas bubble with ultrasonic wave reflection time from its surface, the simulation results show that the spatial imaging error (SIE) factor is less than 2%.