Design of crude oil water content measuring chip based on RF method

Abstract

Abstract Based on the measurement principle of RF method, a crude oil moisture content detect chip is designed with 180 nm CMOS technology. All crude oil water content detect circuits are integrated on a chip for the first time. The chip can realize capacitance measurement in the range of 50–3000 pF, the maximum output current reaches 22 mA, and the maximum current span is less than 0.062 mA. The test results of the crude oil water content measurement system built based on the chip show that the water content test results have high linearity, with the maximum output current span of 1.09 mA. With the help of modern numerical calculation methods, the actual water content in crude oil can be accurately obtained by parameter calibration of the measured value. The inherent shortcomings of the detection circuit built with discrete components are solved, which means that the detection circuit of crude oil water content has fewer components, smaller size, and higher detection accuracy.