Evaluation Electronics of a coriolis mass flow sensor

Details Evaluation Electronics of a coriolis mass flow sensor Evaluation Electronics of a coriolis mass flow sensor

1995-08-14

1997-07-15

Chilcot, Richard

Measuring and testing

Volume or rate of flow

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

G01F 184

Patent

active

056486162

ABSTRACT:
In the evaluation electronics of a Coriolis mass flow sensor, two preamplifiers provide output signals that are applied to a fixed gain amplifier and a variable gain amplifier. Outputs from the two gain amplifiers are applied to a difference stage having an output coupled to a changeover switch. The output of the fixed gain amplifier is also coupled to the changeover switch. A summing/integrating stage receives signals from the preamplifiers and is connected to a phase locked-loop followed by a phase measuring and phase adding stage having an output that provides first and second phase shifted signals. A first synchronous rectifier is clocked by the first phase shifted signal and has an output connected to a switch. A sequencer keeps the switch ON during an ON period and switches the changeover switch to the difference stage except during a short measurement period during which the sequencer activates a phase measurement. A second synchronous rectifier is clocked by the first phase shifted signal during the measurement period and by the second phase shifted signal during the ON period and has an output connected to an integrator. The input of a memory stage is connected the integrator during the measurement period. A divide stage has a dividend input, a first divisor input, and a second divisor input that are, during the ON period, connected to the integrator, the memory stage, and the phase-locked loop, respectively, and provides a signal proportional to the mass flow rate.

REFERENCES:
patent: 4911020 (1990-03-01), Thompson
patent: 4914956 (1990-04-01), Young et al.
Amberger et al., "Unmittelbare Messung des Massedurchflusses mit Hilfe der Coriolis-Kraft", Automatisierungstechnische Praxis atp. 30. Jahrgang. Heft May 1988, pp. 224-230 (English translation included).
Alan Young, Ph.D., "Coriolis Mass Flow Measurement", Measurements & Control, Sep., 1988, pp. 195-197.

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