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A passive signal processing technique for monomode fibre optic vortex shedding flowmeters

A passive signal processing technique is described for the recovery of the frequency of large amplitude oscillatory measurements from interferometric fibre optic sensors. The technique was developed for vortex shedding flowmeters, and was evaluated in this application and compared with other signal processing schemes. The flow-induced vibration frequency of one arm of a fibre Mach-Zehnder interferometer was measured in wind-tunnel experiments, demonstrating a linear frequency flow characteristic over the range 2.5-8 m s-1. Values for the fibre strain amplitude were also obtained.