Measuring and testing – Volume or rate of flow – System
Patent
1977-09-23
1978-11-07
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
System
G01F 132
Patent
active
041239407
ABSTRACT:
A transmission system for a vortex-shedding flowmeter adapted to measure the flow rate of fluid passing through a flow tube by generating fluidic oscillations whose frequency varies with flow rate. These oscillations are detected by a sensor/resonator included in the frequency-determining circuit of a carrier oscillator having a predetermined center frequency. The carrier frequency is caused to deviate from the center frequency at a rate depending on the frequency of the fluidic oscillations and to an extent depending on the amplitude of these oscillations to produce an F-M carrier signal which is mixed with a local oscillator signal to produce a negative beat signal having a relatively low frequency. Though the deviation in the carrier frequency produced as a function of fluid flow rate represents a small percentage change, this same deviation as reflected in the beat signal represents a greatly multiplied percentage change and hence gives rise to a significant increase in sensitivity. The beat frequency is applied to an F-M demodulator to yield an output voltage whose frequency is a function of flow rate, this voltage being converted into a varying D-C flow signal that is transmitted over a two-wire line.
REFERENCES:
patent: 2613347 (1952-10-01), Todd
patent: 2697594 (1954-12-01), Stanton
patent: 2809520 (1957-10-01), Richard, Jr.
patent: 3215900 (1965-11-01), Harvey
patent: 3689907 (1972-09-01), Guoyardo
patent: 3895912 (1975-07-01), Naumann
Herzl Peter J.
Shaffer Robert G.
Ebert Michael
Fischer & Porter Company
Goldstein Herbert
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