Microwave fluid flow meter

Details Microwave fluid flow meter Microwave fluid flow meter

1973-06-13

1976-02-17

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

73 55, 73194E, 73211, 73398R, G01r 2704

Patent

active

039394069

ABSTRACT:
A microwave fluid flow meter is described utilizing two spaced microwave sensors positioned along a fluid flow path. Each sensor includes a microwave cavity having a frequency of resonance dependent upon the static pressure of the fluid at the sensor locations. The resonant response of each cavity with respect to a variation in pressure of the monitored fluid is represented by a corresponding electrical output which can be calibrated into a direct pressure reading. The pressure drop between sensor locations is then correlated as a measure of fluid velocity.
In the preferred embodiment the individual sensor cavities are strategically positioned outside the path of fluid flow and are designed to resonate in two distinct frequency modes yielding a measure of temperature as well as pressure. The temperature response can then be used in correcting for pressure responses of the microwave cavity encountered due to temperature fluctuations.

REFERENCES:
patent: 1673674 (1928-06-01), Goetz
patent: 2494570 (1950-01-01), Mezger
patent: 3124956 (1964-03-01), Stohldrier
patent: 3161060 (1964-12-01), Kemmer
patent: 3327522 (1967-06-01), Hoyt
patent: 3548638 (1970-12-01), Uchida et al.
patent: 3688188 (1972-08-01), Bak et al.

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