Two-wire transmission system for vortex-type flowmeters

Details Two-wire transmission system for vortex-type flowmeters Two-wire transmission system for vortex-type flowmeters

1977-10-27

1979-01-16

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

System

G01F 132

Patent

active

041342976

ABSTRACT:
A two-wire transmission 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 that is included in the tuned circuit of a high-frequency carrier oscillator whose frequency is determined by the normal resonance characteristics of the element in the absence of the pulses. The pulses applied to the element cause the oscillator to yield a carrier that is frequency-modulated in accordance with the repetition rate of the pulses to produce a frequency-modulated carrier that is demodulated to yield an output signal whose frequency is a function of flow rate. This signal is converted into an analog voltage that is conveyed over a two-wire transmission line to a remote station.

REFERENCES:
patent: 2697594 (1954-12-01), Stanton
patent: 2809520 (1957-10-01), Richard, Jr.
patent: 3122707 (1964-02-01), Godbey
patent: 3895912 (1975-07-01), Naumann
patent: 3948098 (1976-04-01), Richardson et al.

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