Sensing system for vortex-type flowmeters

Details Sensing system for vortex-type flowmeters Sensing system for vortex-type flowmeters

1977-02-14

1978-06-13

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

System

G01F 132

Patent

active

040941949

ABSTRACT:
A sensing system for a vortex-type flowmeter adapted to measure the flow rate of fluid passing through a conduit by generating fluidic oscillations giving rise to periodic pressure pulses whose repetition rate varies in accordance with flow rate. The system includes a pressure-responsive resonator element, such as a piezoelectric crystal which is included in the circuit of a high-frequency oscillator whose carrier frequency is determined by the normal resonance characteristics of the element in the absence of applied pressure pulses. The pressure pulses applied to the element cause the oscillator to yield a carrier signal having both a frequency-modulation and an amplitude-modulation component, each component depending on the repetition rate of the pulses as a function of flow rate. One of these components is demodulated independently of the other to produce an output signal whose frequency is proportional to flow rate.

REFERENCES:
patent: 2790145 (1957-04-01), Barteliant
patent: 2809526 (1957-10-01), Richard, Jr.
patent: 3033043 (1962-05-01), Runst
patent: 3053087 (1962-09-01), Waugh
patent: 3101615 (1963-08-01), Pavone
patent: 3122707 (1964-02-01), Godbey
patent: 3177711 (1965-04-01), Ham et al.
patent: 3455162 (1969-07-01), Michener et al.
patent: 3698245 (1972-10-01), McNabb
N.R.I. Book "Frequency Modulated Signals," pp. 1-3, 1973.

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