Microwave fluid flow meter

Details Microwave fluid flow meter Microwave fluid flow meter

G - Physics

01

F

73/69, 340/140.1

G01F 1/58 (2006.01) G01F 1/34 (2006.01)

Patent

CA 1037141

ABSTRACT OF THE DISCLOSURE 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 loca- tions 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 fluctua- tions.

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