Device for measuring the flow rate of a fluid and air flow senso

Details Device for measuring the flow rate of a fluid and air flow senso Device for measuring the flow rate of a fluid and air flow senso

1980-10-09

1982-11-30

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using differential pressure

7386161, 73DIG4, G01F 138

Patent

active

043610501

ABSTRACT:
A flowmeter incorporating a pressure differential member creating a differential pressure between an upstream flow path and a downstream flow path of a pipe. The flowmeter has pressure connecting lines located on either side of the pressure differential member and constituted by conduits issuing on the surface of the device. The pressures in the upstream and downstream flow paths are transferred to a differential pressure sensor constituted by two elastic surface wave oscillators supplying signals, whose frequency is proportional to the pressures. The signals are then transmitted to a mixer, whose output supplies a beat signal, whose frequency is equal to the difference of the frequencies of the signal supplied by the oscillators. This frequency difference is directly proportional to the differential pressure.

REFERENCES:
patent: 1298471 (1919-03-01), Dodge
patent: 1904333 (1933-04-01), Smith, Jr.
patent: 2734526 (1956-04-01), Aagaard
patent: 2942465 (1960-06-01), Carbone
patent: 3521487 (1970-07-01), Akeley
patent: 3978731 (1976-09-01), Reeder et al.
patent: 4100811 (1978-07-01), Cullen et al.
Proceedings of the IEEE, vol. 64, No. 5, May 1976, T. M. Reeder et al., "Surface-Acoustic-Wave Pressure & Temperature Sensors", pp. 754-756.

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