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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...
The AC-based capacitance measuring circuits are widely used in electrical capacitance tomography. In the circuit, the desired exciting and measuring signals are alternative current (AC) ones that should have a zero direct current (DC) component. However, because of the non-deal characteristics of the operational amplifiers and other electronic components, DC biases, i.e., nonzero DC components always...
An experiment of vortex flowmeter in oil-gas-water vertical upward three phase flow has been reported in this paper. In this research, the diameter of the pipeline is 50mm. The flow of the water varies from 5m3 /h to 8 m3 /h. For the total mixed flow, oil is occupying from 5% to 30%, and the gas proportion of the void fraction is from 1% to 5%. The results show that the measurement error of oil-gas-water...
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