Reflective acoustic fluid flow meter

Details Reflective acoustic fluid flow meter Reflective acoustic fluid flow meter

1984-08-23

1985-12-03

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 166

Patent

active

045559511

ABSTRACT:
In one embodiment, a first air flow meter includes a pair of ultrasonic transducers mounted on one wall of a conduit, and an opposite reflective wall is shaped to focus acoustic signals from one transducer to the other. In a second embodiment, the opposite wall is separated into a stepped series of cylindrical reflective surfaces spaced from the transducers by different distances, each surface being one-half wavelength from its adjoining surfaces so that constructive combination of the acoustic signals occurs. For noise of the same wavelength emitted at sources axially spaced from the transducers, the reflective surfaces appear to be spaced by approximately 3/4-wavelength steps so that reflected noise signals tend to cancel.

REFERENCES:
patent: 4195517 (1980-04-01), Kalinoski et al.
patent: 4308754 (1982-01-01), Pedersen et al.

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