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Vortex flow meters, also referred as as vortex shedding flow meters or oscillatory flow meters, measure the vibrations of the downstream vortexes caused by a barrier in the moving stream. An obstruction in a fluid flow creates vortices in a downstream flow. Every obstruction has a specific critical fluid flow speed at which vortex shedding occurs. Vortex shedding is the instance where alternating low pressure zones are generated in the downstream. These alternating low pressure zones cause the obstruction to move towards the low pressure zone. The vibrating frequency of the vortex shedding is related to the velocity of the flow. With sensors gauging the vortices the strength of the flow can be measured.