Acoustic flow sensors

Details Acoustic flow sensors Acoustic flow sensors

1982-06-14

1984-07-31

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386177, G01F 110

Patent

active

044622643

ABSTRACT:
Disclosed acoustic flow sensors include a cylindrical wall that forms a cylindrical flow passage, a flow activated rotor in the passage, and an electrical generator for developing flow-representing signals. In probe type flow sensors, the cylindrical wall is a shroud surrounding the rotor and forming a flow metering passage within a larger main passage, and the disclosed one or two piezoelectric device is/are decoupled from the fluid outside the shroud by sound-deadening material and coupled to the fluid within the shroud. For both probe-type flow sensors, and in-line flow sensors, the cylindrical wall is stressed and subjected to arcuate dimension change by piezoelectric device(s) of the radial-mode type bonded to the cylindrical wall.

REFERENCES:
patent: 3751979 (1973-08-01), Ims
patent: 3788285 (1974-01-01), Gelin et al.
patent: 4348906 (1982-09-01), Feller

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