Combined output and drive circuit for a mass flow transducer
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United States of America Patent
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Jun 18, 1991
Grant Date -
N/A
app pub date -
Dec 21, 1989
filing date -
Dec 21, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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