Water continuous oil-water flow velocity measurement based on continuous waves ultrasonic doppler method

A method for water continuous oil-water two-phase flow velocity measurement by using Continuous-Wave Ultrasonic Doppler (CWUD) technique is proposed. Two ultrasonic transducers with a center frequency of 1 MHz were used for emitting and receiving the ultrasound signals. The frequency of received signals changes with flow velocity, and these signals were collected through a PXI based data acquisition system. The acquired signals were transformed from time domain to frequency domain through Fast Fourier Transform (FFT) for obtaining the Doppler frequency shift. Theoretical models were set up to correlate the Doppler frequency shift with mean flow velocity. Experiments in a horizontal pipe were completed. The measured results show good agreement with reference flow velocity.