Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Patent
1989-12-21
1991-06-18
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Mass flow by imparting angular or transverse momentum to the...
G01F 184
Patent
active
050241044
ABSTRACT:
Amplitude-balanced input signals (I.sub.1 and I.sub.2) from two pick-up coils spaced along a vibrating tube mass flow transducer are used to form sum and difference signals (S and D). These are multiplied by quadrature and in-phase signals (Q and I) respectively in multipliers, the multiplying signals being generated by a phase-locked loop locked to the sum signal (S). The in-phase signal (I) provides the drive signal for a drive coil (12) of the transducer. The product signals (P.sub.S and P.sub.D) from the two multiplier are smoothed in low pass filters to provide sum and difference voltages (V.sub.S and V.sub.D). Mass flow rate is proportional to the phase difference (represented by the ratio of these voltages) divided by the frequency of the I signal. The density of the fluid in the transducer is indicated by the frequency of the I signal.
REFERENCES:
patent: 4747312 (1988-05-01), Herzl
patent: 4801897 (1989-01-01), Flecken
patent: 4852409 (1989-08-01), Herzl
patent: 4911020 (1990-05-01), Thompson
The article "Coriolis Mass Flow Measurement" by ALan Young, pp. 195-197, Measurements and Control, Sep. 1988.
Asman Sanford J.
Goldstein Herbert
Schlumberger Industries Limited
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