Abstract
To meet the actual requirements of multi-phase measurement, a fiber-conductance dual-mode sensor (FCDMS) is designed and developed. The theoretical model of the FCDMS measurement field is established, and the light transmission process’s mathematical description and simulation analysis in the sensitive conical tip is carried out. Thereafter, The FCDMS simulation model is established by the ZEMAX ray-tracing method and Finite Element Method (FEM). the effects of structural parameters on sensitivity distribution are analyzed, including the electrode length, the radius of the electrode, and the cone angle of the sensitive tip. Furthermore, we studied the response characteristics of FCDMS in oil-gas-water multi-phase flow. At the same time, the temperature influence experiments and dynamic experiments validate the designed FCDMS, indicating the FCDMS enables measuring the phase holdup of oil-gas-water multi-phase flow. The developed FCDMS could realize the phase holdup measurement with the liquid flow rate range of 10-70m<sup>3</sup>/d, the gas flow rate range of 5-40m<sup>3</sup>/d and the liquid water holdup range of 50-90%.
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