Acoustic oscillator fluid velocity measuring device

Details Acoustic oscillator fluid velocity measuring device Acoustic oscillator fluid velocity measuring device

1975-11-17

1977-01-18

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 166

Patent

active

040032566

ABSTRACT:
A fluid velocity measuring device for the accurate fast measurement of the velocity of a fluid whether liquid or gas using the time of passage of acoustic energy through the fluid as the frequency determining element in a continuous wave oscillator. The frequencies or periods of oscillations of two anti-parallel acoustic paths are used to compute fluid velocity between the electro-acoustic transducers at the ends of the acoustic paths. The device in accordance with this invention may utilize a single reversing acoustic path or two anti-parallel acoustic paths. The velocity resolution can be selected by the operator in accordance with a stated uncertainty principle limiting the ratio of frequency response to velocity resolution. Mode ambiguities due to fluid phase velocity variations are avoided by varying the path lengths. The frequency range of the oscillator is limited by a phase locked loop.

REFERENCES:
patent: 2826912 (1958-03-01), Kritz
patent: 3420102 (1969-01-01), Brown
patent: 3697936 (1972-10-01), Zacharias, Jr. et al.
patent: 3720105 (1973-03-01), Cirulis
patent: 3751979 (1973-08-01), Ims

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