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The existing capacitively coupled contactless conductivity detection (C4D) sensors are mainly used to detect the conductivity/ion concentration in capillary tube. A new sensor for conductivity measurement in large-scale pipes is developed based on the C4D technique. A quartz crystal is introduced to eliminate the influence of the coupling capacitances. Meanwhile, a quartz crystal oscillator is designed...
Based on empirical mode decomposition (EMD) and least squares support vector machine (LS-SVM), a new method is proposed to identify the flow pattern of gas-liquid two-phase flow in a minichannel. Four flow patterns are observed in three pipes with inner diameters of 4.0, 3.1, and 1.8 mm. For each flow pattern, the capacitance signals are obtained by a two-electrode capacitance sensor. The EMD method...
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