| 摘要 |
A vortex shedding flowmeter includes a vortex sensor detecting lift force generated by vortices shed from the vortex generator and experienced thereby, and a noise sensor detecting mechanical vibrations experienced commonly thereby and by the vortex sensor, wherein two electrical signals respectively generated by the vortex and noise sensors are combined in such a way that noise associated with the mechanical vibrations is cancelled therebetween and a resultant electrical signal representing the vortex shedding from the vortex generator is obtained, which resultant electrical signal provides information on the frequency and amplitude of the lift force alternating in time experienced by the vortex sensor, wherein volume flow rate of the fluid is determined from the frequency of the alternating lift force, mass flow rate of the fluid is determined as a function of the frequency and amplitude of the alternating lift force, and the density of fluid is determined from the ratio of the mass flow rate to the volume flow rate of the fluid.
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