Acoustic flowmeter with envelope midpoint tracking

Details Acoustic flowmeter with envelope midpoint tracking Acoustic flowmeter with envelope midpoint tracking

1982-10-01

1984-11-06

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 166

Patent

active

044804857

ABSTRACT:
An acoustic burst with a predetermined amplitude envelope is triggered by a square wave signal and transmitted upstream or downstream to a transducer connected to an adaptive control system which tracks the midpoint of the received envelope. The received signal is rectified and fed via a polarity reversing circuit controlled by the square wave to an integrator whose output level controls the frequency of the square wave. The burst transit time is measured to the next zero crossing of the received signal following the half cycle transition point of the square wave.

REFERENCES:
patent: 3512410 (1970-05-01), Vander Heyden
patent: 4011755 (1977-03-01), Pedersen et al.
patent: 4079315 (1978-03-01), Mohr
patent: 4167879 (1979-09-01), Pedersen
patent: 4183244 (1980-01-01), Kohno et al.
patent: 4271708 (1981-06-01), Kohno et al.
patent: 4300401 (1981-11-01), Pedersen
patent: 4308754 (1982-01-01), Pedersen et al.

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