Method and apparatus for ultrasonic measurement of the rate of f

Details Method and apparatus for ultrasonic measurement of the rate of f Method and apparatus for ultrasonic measurement of the rate of f

1979-08-20

1982-01-26

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 166, G01P 500

Patent

active

043122396

ABSTRACT:
A method of ultrasonic measurement of a rate of flow utilizes simultaneous passage of two auto-circulation pulse trains of opposite directions through a single acoustic channel and through the medium under control so that the instants at which the pulses of the trains are brought into coincidence are eliminated. The pulses of one pulse train are used to phase-synchronize a self-excited oscillator whose frequency is a whole number of times the repetition rate of such pulse train. The coincidence instants are eliminated by interrupting the same pulse train before a specific instant of coincidence and restoring it with the help of a pulse produced by the self-excited oscillator. The pulse is held out of coincidence with a pulse of the other pulse train. The rate of flow is the difference between the repetition rates of the pulses of the trains and is determined by comparing the repetition rate of the pulses of the other train with the frequency of the self-excited oscillator.

REFERENCES:
patent: 3678731 (1972-07-01), Wells et al.

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