Mass flowmeter converter

Details Mass flowmeter converter Mass flowmeter converter

1995-05-31

1997-02-11

Dougherty, Elizabeth L.

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

73861357, G01F 184

Patent

active

056023464

ABSTRACT:
A mass flowmeter converter detects a Coriolis force acting on a flow tube driven at a constant frequency as a time difference .DELTA.T between two displacement signals detected at symmetrically opposed positions. A mass flow proportional to the time difference .DELTA.T is determined. Sine-wave signals differing in phase and at a constant amplitude are detected paired detecting coils and provide input signals which are pulses having specified pulse width values equal to a leading time (T+.DELTA.T) and a lagging time (T+.DELTA.T). N number of pulses (T+.DELTA.T) and N number of pulses (T-.DELTA.T) are sampled simultaneously by respective integrators having the same time constant, and by using a reference power source a time difference of zero-crossing voltages and a time difference signal enlarged by 2N times is detected. Furthermore, a small time measurement error due to drifts of the charging-discharging circuit is compensated by alternating respective integrators.

REFERENCES:
patent: 4187721 (1980-02-01), Smith
patent: 4422338 (1983-12-01), Smith
patent: 4817448 (1989-04-01), Hargarten et al.
patent: 5024104 (1991-06-01), Dames
patent: 5295084 (1994-03-01), Arunachalam et al.
patent: 5398554 (1995-03-01), Ogawa et al.
patent: 5469748 (1995-11-01), Kalotay

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