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A low-cost and fast resonant cavity watercut meter using amplitude measurement

Replacing the expensive and bulky network analyzers and moving toward stand-alone measurement equipment is a live topic of research for resonant cavity-based watercut meter sensors. In this paper, we distinguish the cavity’s resonant frequency using transmitting signal amplitude. This frequency is proportional to the watercut of water-oil or water-gas in multi-phase flows. To prove the concept, a resonant cavity sensor (RCS) was fabricated. To improve the transmission coefficient of RCS, an impedance matching circuit was also implemented. Since there is no feedback in the sensing chain, this method is very fast. Moreover, reducing the number of elements leads to a lower cost.