Sensor and meter for measuring the mass flow of a fluid stream

Details Sensor and meter for measuring the mass flow of a fluid stream Sensor and meter for measuring the mass flow of a fluid stream

1980-09-02

1982-01-26

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 128, G01F 178

Patent

active

043122353

ABSTRACT:
A flowmeter for measuring the mass flow of a fluid stream, such as air, in a duct includes a sensor and electronic circuitry. The sensor includes a drag surface mounted to or forming part of an oscillatory element and mounted in the fluid stream for flow-damped oscillation. The oscillatory element is stimulated by a drive transducer and a pickup transducer senses the flow-damped oscillations. An intermediate circuit terminates the drive at a certain peak amplitude and measures the time interval required for the amplitude of the flow-damped oscillations to decay a predetermined amount. That interval is indicative of the fluid mass flow.
The sensor may be a cantilevered beam. The beam may also be disposed behind a shroud and include a drag plate extending upstream of the shroud therefrom. The sensor may be a beam constrained to torsional oscillation about a longitudinal axis. The transducers are piezoelectric devices mounted on a beam in proximity with its neutral axis.

REFERENCES:
patent: 2741918 (1956-04-01), DeBoisblanc
patent: 3218851 (1965-11-01), Sipin
patent: 3368213 (1968-02-01), Quinn
patent: 3426593 (1969-02-01), Jacobs
patent: 3608374 (1971-09-01), Miller
patent: 3625058 (1971-07-01), Endress
patent: 4193010 (1980-03-01), Kompanek
Rusnak et al., "Linear Momentum Flowmeter Design and Performance", in Flow, its Measurement and Control, 1974, pp. 871-883.
Klinger, "A New Engine Air Mass FLow Meter", in SAE Publication, 800469, 1980, pp. 1-5.

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