Patent ID: 7398165

Claim:
An intelligent signal processor of a vortex flowmeter, and the vortex flowmeter comprising a vortex shedder, an electronic device, a sensor and a circular pipe, and the vortex shedder being comprised of a flat plate perpendicular to a bluff body, and the vortex shedder having a T-shape cross section; and the electronic device being fixed to the vortex shedder, and comprising an amplifier, a wave filter and a signal processor; the sensor being installed on the flat plate of the vortex shedder and electrically coupled to the electronic device; the circular pipe being provided for fixing and limiting the vortex shedder, and the circular pipe being connected to a pipeline having a fluid flow for forming a shedding vortex for a fluid passing through the circular pipe by the vortex shedder, characterized in that: the signal processor is electrically coupled to the wave filter, and the signal processor comprises a wave filter unit and a frequency calculating unit, and the wave filter unit comprises a digital band-pass filter and an amplitude detector; the digital band-pass filter is provided for receiving a computation result from the amplitude detector to adjust its internal parameters, and filter noises of a signal transmitted from the wave filter; the frequency calculating unit comprises a fast Fourier transformation (FFT) unit and an auto-correlation unit; the fast Fourier transformation (FFT) unit computes a signal output from the wave filter unit, and the auto-correlation unit computes the signal output from the wave filter unit; wherein the vortex flowmeter produces a vortex in the fluid when measuring a fluid flow, and uses the measured vortex shedding frequency to compute the flow of the fluid.