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A multifibre optic sensor to measure the liquid film thickness between a moving bubble and an inclined solid surface

In this paper, a multifibre optic sensor is developed to measure the thickness of the liquid film located between a moving bubble and an inclined surface. The sensor takes into account the presence of a second interface independently of its distance from the solid surface. In the first part of the paper, a mathematical model is developed to simulate the behaviour of several configurations of the fibre optic sensor in order to determine the best configuration of the sensor. In the second part, the calibration setup is presented and described in detail. In the last part of the paper, the method is validated. The results showed that the applicability range of the sensor is from 125 µm to 1400 µm. In the operating range, the accuracy of the sensor is around 5%.