Optimization of PMMA fiber optic sensor technique in gas-liquid flow measurement

In this paper, a research of PMMA optical fiber reflectivity changing along with the angle of tips has been studied. A type of integrated conical fiber probe is designed. Nine angles of cone fiber tips were fabricated and tested in 0.4 L /min continuous uniform bubble flow (air) in this study to validate the performance of each cone angle. A simulation model of PMMA optical fiber tip was established based on physical properties of fiber to simulate the reflectivity of different angle tips set into gas/liquid environment. The first and second high peaks of experimental data agree well with the positions of those calculated using the simulation.