A novel optical fibre fluid velocity sensor is described that is based on a specially manufactured optical fibre fused tapered coupler, folded to produce a probe geometry. The splitting ratio of this miniature transducer is sensitive to bending and can be easily and cheaply measured using an LED source and simple opto-electronics. The packaging of the transducer has been optimised to produce a sensor for fluid velocity measurements. A description of the fabrication process and the results obtained during initial airflow measurements in a wind tunnel are presented.
M. P. Whelan, M. P. Whelan,
"Novel fibre optic fluid velocity sensor", Proc. SPIE 4185, Fourteenth International Conference on Optical Fiber Sensors, 41853A (9 November 2000); doi: 10.1117/12.2302261; https://doi.org/10.1117/12.2302261