This work introduces a new approach to characterize the multiphase flow by means of the utilization of optical fiber Bragg gratings. Here, the force applied by the air/liquid flow on the fiber gratings is the underlying mechanism of these sensors. Flow images are constructed from the response of a 8x8 mesh of sensors, with a total of 16 different FBGs multiplexed in wavelength. The data from each sensor has been processed in order to obtain a 2D plot of the air/liquid phase as well as a 3D plot of the air bubbles inside the tube for each time interval.
Optical fiber Bragg grating strain sensors are used to characterize the multiphase flow of water and air in a laboratory
test bed. The load applied by the fluid flow on the fiber gratings is the underlying mechanism of the sensor and different
flow conditions with distinct void fractions and flow rates were investigated. The optical fiber sensors performance was
compared against that of a wire-mesh system which is conventionally used as a reference high performance measurement
tool for multiphase flow. Results are in good agreement showing the potential of the technique.
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