Abstract
To progress in the understanding of phase detector capabilities, a first requirement has been fulfilled by manufacturing reproducible sensors. A second objective, investigated in this paper, is to diminish the sensitivity of the processing technique to the various criteria required to perform the signal analysis. A new real-time signal processing technique, based on optical probe responses during probe–interface interactions, is presented, and its objectiveness is demonstrated. When used with mono-fiber or dual-fiber sensors, it provides local void fraction and gas velocity measurements. The performance of these measuring chains is evaluated in various air–water two-phase flows for different probes. Possible mechanisms responsible for void fraction uncertainties are discussed. It is also shown that monofiber probes with a conical–cylindrical–conical extremity are well suited to measure gas velocities in dispersed two-phase flows.
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