Study on stabilized zero-point of electromagnetic flowmeter with rapid excitation

Saito, Keiji; Sakurai, Yasuhisa; Okayama, Tsutomu

doi:10.1109/imtc.1994.351981

Cited by 4 publications

(2 citation statements)

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“…Moreover, since the induced electromotive force generated by the fluid cutting magnetic induction line is proportional to the excitation intensity, there is always an electromagnetic constant in the positive and negative excitation generated by the excitation current through the excitation coil, so the increase in the excitation frequency is bound to be limited. [26] in addition to slurry noise. All three-value rectangular wave excitation will result in this kind of peak interference in the switching of excitation.…”

Section: Electrode Signal and Excitation Frequency Characteristicmentioning

confidence: 99%

“…The magnetic field is changed during the excitation switching phase. Due to the electrode wiring deviation and other reasons, an EMF will experience the "transformer effect" and form differential interference [9][25] [26] in the measurement circuit. The duration of the differential interference is related to the coil parameters, electrode wiring and other factors.…”

Section: Parameter Design Of the Excitation Step Ordermentioning

confidence: 99%

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Study of the Ability of an Electromagnetic Flowmeter Based on Step Excitation to Overcome Slurry Noise

Yue

Chen

et al. 2020

IEEE Access

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An electromagnetic flowmeter (EMF) can be used to measure the speed of slurry fluid. In this paper, according to Maxwell's equations and the dB/dt vortex electric field, a step excitation scheme is proposed. The original excitation process of the primary excitation current rise time is divided into a twostep excitation process. Without increasing the excitation current rise time, the equivalent excitation frequency is increased by increasing the primary dB/dt. This method can enhance the EMF's ability to overcome slurry noise. The paper analyzes the design parameters of the step excitation scheme and designs the software and hardware. After that, the paper compares the step excitation scheme with the three-value rectangular wave excitation scheme based on wavelet transform signal processing. Experiments show that the step excitation EMF has a lower steady-state fluctuation rate when measuring mortar and has a stronger ability to overcome slurry noise. Additionally, the step excitation EMF and Yokogawa AXF 040G EMF are compared experimentally. Through flow calibration, clean water measurement, mortar measurement and dynamic response experiment, it is verified that the step excitation EMF has the ability to enhance the resistance to slurry noise at the same excitation frequency.

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Section: Electrode Signal and Excitation Frequency Characteristicmentioning

confidence: 99%

Section: Parameter Design Of the Excitation Step Ordermentioning

confidence: 99%