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Online measurement of water concentration of oil–water mixtures in the flow of pipeline by using eddy current method

Measurement of water concentration of oil–water mixtures in a pipeline is important in the oil industry. Capacitance, γ-ray and ultrasonic techniques have been developed for the purpose of water-cut measurement for years. In this paper, we demonstrate a new non-contact method, which uses an eddy current sensor to monitor the flow in a pipeline based on the relationship between the water-cut of the flow and the inductance of the sensor. A simulation model and a simple experiment setup are presented. The experimental results have shown that the measurement error for water-cut over the range of 0–100% is less than 4.5%.