This paper introduces an application of the time-domain gating technique in water content measurement of gas-liquid two-phase flow. According to the principle that water and gas have different absorption effects on microwaves, a sensor with transmitting and receiving antennas is designed. Combined with the back propagation neural network, the water content of two-phase fluids can be obtained from the complex transmission coefficient (S) of antennas. In order to reduce the influence of the sensor structure on antenna measurement, the time-domain gating technique can be used to filter out the interference components in S so that the water content can be more easily predicted. Built on the above, an automatic test system is established. In the range of 0%-78%, the absolute test error of the water content is lower than 3%.
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