Fluid flowmeter

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G - Physics

01

N

73/125

G01N 21/17 (2006.01) G01F 1/32 (2006.01) G01F 1/66 (2006.01)

Patent

CA 1198296

FLUID FLOWMETER Abstract of the Disclosure In order to determine the vortex shedding frequency, from which the fluid flow rate may be calculated, an optical beam, such as produced by a laser, is passed through a fluid, transversely to a vortex street therein, and modulated in dependence on the alternate high and low velocity regions comprising the vortex street. The modulated signal is detected and "cleaned" of noise by filtering with a first (high) band-pass filter of a centre frequency fc, such that the first filter output comprises an amplitude modulated signal of carrier frequency fc modulated by the vortex shedding frequency, that is the frequency of oscillation of the power spectra between the respective curves for the high and low velocity regions. The first filter output is demodulated and filtered by a second (low) band-pass filter, whose output is of a frequency comprising the vortex shedding frequency.

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