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In this paper, a sensor of conductance probe is proposed to detect the electrical characteristics of the oil-water flow in vertical well. Statistic and wavelet packet decomposition are employed to extract the features of the voltage response of conductance probe. A method based on principal component analysis (PCA) and support vector classification (SVC) is proposed to identify the flow patterns from...
In this paper, a digital demodulation method used for AC-based electrical tomography systems is presented. The demodulation result can be easily obtained by rectifying the sinusoidal measurement signal in a digital way. The proposed demodulation method has some distinguished characteristics: (a) with a concise configuration, it can be implemented on simple digital signal processors without hardware...
In this paper, a dual-channel pseudorandom sequence generator is presented for the calibration of cross correlators in flow metering. In the sequence generator, the two channels have completely identical hardware structures so that they generate two identical sequences of pseudorandom signals to simulate two signals obtained from the upstream and downstream sensors of a cross correlator, respectively...
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