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Title: Improving Vortex Flow Metering Using Ultrasound
Author: Volker Hans
Source: Flomeko 2003
Year Published: 2003
Abstract: Commercial vortex flowmeters use the well-known effect of Karman vortex street. The frequency of vortices generated in the wake of a bluff body is proportional to the average flow velocity. Usually it is detected by pressure sensors which are not very sensitive. Therefore bluff bodies of big sizes are required. An alternative method to detect the vortices in the streaming fluid is to use a high sensitive ultrasonic wave which is complex modulated. The demodulation can be executed by digital signal processing. Small sizes of bluff bodies can be realized. The bluff body size and the carrier frequency must be harmonized.

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