Vortex shedding fluid flowmeter

Details Vortex shedding fluid flowmeter Vortex shedding fluid flowmeter

1983-02-28

1985-05-28

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 132

Patent

active

045192596

ABSTRACT:
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 center frequency f.sub.c, such that the first filter output comprises an amplitude modulated signal of carrier frequency f.sub.c 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.

REFERENCES:
patent: 2813424 (1957-11-01), Liepmann et al.
patent: 3680375 (1972-08-01), Joy et al.
patent: 3818877 (1974-06-01), Barrera et al.
patent: 4318303 (1982-03-01), Harrington
patent: 4339661 (1982-07-01), Pitt et al.
patent: 4375768 (1983-03-01), Beck et al.
patent: 4418579 (1983-12-01), Harrington

Affiliated with

Also associated with

Rating

Vortex shedding fluid flowmeter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Vortex shedding fluid flowmeter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vortex shedding fluid flowmeter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-862685