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Jul 09 , 2019
According to the characteristics of the general Smart Electromagnetic Flow
Meter system, the interference source of the electromagnetic flow meter is
mainly discussed from the aspect of hardware optimization. For example,
electromagnetic coupling and electrostatic induction are important sources of
interference noise generated by the smart electromagnetic flow meter. In an
electromagnetic flow transmission, since the leads of the two electrodes are in
an alternating magnetic field, an induced electromotive force is generated in
the closed loop of the lead when the transmission is energized. This
interference signal is superimposed on the measurement signal, which affects the
operation of the system. The generation of various excitation methods will bring
different electromagnetic interference problems. The DC excitation method is
prone to polarization interference, and the AC excitation method is easy to
generate orthogonal interference (90-degree interference) and in-phase
interference.
Orthogonal interference refers to interference that is 90 degrees out of phase with the flow signal. When the intelligent electromagnetic flow transmitter adopts the AC excitation mode, an alternating magnetic field is generated, and the closed loop composed of the electrodes, the lead wires, the measured medium and the input circuit of the converter is in the interference alternating magnetic field. The closed loop cannot be completely parallel with the magnetic field lines generated by the alternating magnetic field of the transmitter. There will always be a part of the alternating magnetic lines of force passing through the closed loop, thereby generating an interference electromotive force in the loop. The two parts of the converter and converter take measures to eliminate or suppress 90° interference.
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