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Abstract
The use of a monomode optical fibre sensing element in the measurement of flow velocities by an interferometric technique is described, in which the operating principle is the flow induced oscillation of the fibre caused by vortex shedding. A design based on an all-fibre Michelson interferometer is described and compared with a Fibre Fabry–Perot design; these both show a linear response with flow velocity over a large Reynolds number range.