Open AccessA high frequency electronic transducer for multiphase flow measurements
Author(s) -
Francisco Antônio Belo,
Luiz Felipe Mendes de Moura
Publication year - 1999
Publication title -
revista brasileira de ciências mecânicas
Language(s) - English
Resource type - Journals
ISSN - 0100-7386
DOI - 10.1590/s0100-73861999000400005
Subject(s) - transducer , differentiator , capacitance , acoustics , slew rate , electrical impedance , bandwidth (computing) , capacitive sensing , amplifier , inductance , sensitivity (control systems) , parasitic capacitance , electronic engineering , materials science , electrical engineering , engineering , electrode , voltage , physics , telecommunications , quantum mechanics
This paper describes an electronic transducer for multiphase flow measurement. Its high sensitivity, good signal to noise ratio and accuracy are achieved through an electrical impedance sensor with a special guard technique. The transducer consists of a wide bandwidth and high slew rate differentiator where the lead inductance and stray capacitance effects are compensated. The sensor edge effect is eliminated by using a guard electrode based on the virtual ground potential of the operational amplifier. A theoretical modeling and a calibration method are also presented. The results obtained seem to confirm the validity of the proposed technique