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Analog signal processing in an AC electromagnetic flowmeter

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3 Author(s)
J. Polo ; Departament Tecnologia, Univ. Pompeu Fabra, Barcelona, Spain ; R. Pallas-Areny ; J. P. Mardn-Vide

AC electromagnetic flowmeters yield a low-frequency signal whose amplitude is proportional to the average fluid velocity. Typically, the input signal magnitude is below 1 mV and suffers a strong electric and magnetic interference from the coils that create the driving magnetic field. This paper provides a novel circuit design to amplify and demodulate the voltage picked up by the electrodes and to minimize interference. The amplifier includes a fully differential front end. The demodulation consists of synchronous rectification and sampling with zero-order hold followed by low-pass filtering. The result is a 0.25-mV/(m/s)/mT voltage, insensitive to DC level shifts.

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:51 ,  Issue: 4 )