Mass flow meter with vibration sensor

Details Mass flow meter with vibration sensor Mass flow meter with vibration sensor

1982-08-06

1984-12-18

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 178

Patent

active

044884397

ABSTRACT:
The mass flow rate of a fluid, for example a gas or air, for example passing through a duct or the like, is determined by placing a vibrating element in the path or stream of air flow, and measuring the damping thereof due to the air flow; the damping can easily be measured, in accordance with the invention, by connecting the vibrating element in a circuit having a servo system including a controlled variable amplifier and a comparator, such as a proportional-integral (PI) controller (14) comparing the signal on the vibrating element with a reference establishing a vibrating amplitude and, in turn, controlling the amplification of the variable amplification amplifier (8) to maintain a constant amplitude of vibration, the control signal controlling the variable amplification amplifier being a measure of the damping, and hence of mass flow rate. To eliminate damping due to extraneous conditions, such as clamping of the mechanical vibrating elements, connection of electrodes and the like, an alternating current (10a) can be fed to the vibrating element, the alternating current having a frequency which is high with respect to the vibration frequency, and then being filtered out by a band-pass filter (17) tuned to the alternating current frequency, the level of the signal across the vibrating element being subtracted from the overall damping signal to thereby eliminate errors due to inherent damping of the mechanical system independent of fluid flow.

REFERENCES:
patent: 3608374 (1971-09-01), Miller
patent: 3710614 (1973-01-01), Oppliger
patent: 3715920 (1973-02-01), Groberman et al.
patent: 4158959 (1979-06-01), Blair

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