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

Li, Bin; Yue, Yan; Chen, Jie; Fan, Xinghang

doi:10.1109/access.2020.3008419

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…In the EMF measuring method shown in Figure 5, −𝑣 × 𝐵 of the "circuit" moves under constant excitation and is used to calculate the induced potential proportional to the fluid velocity, 𝑣. The ∇ × 𝐸 = − 𝜕𝐵 𝜕𝑡 is corresponds to "field alterations" at the constant switching excitation, where ∇ × is a curl operator, 𝜕𝐵 𝜕𝑡 is the rate of change in magnetic field, and 𝐸 is the vortex electric field, as shown in Figure 5 values, lower the possibility that solid particles striking the electrode results in slurry noise interfering with the electrode signal [22].…”

Section: Excitation Frequencymentioning

confidence: 99%

“…Synchronous rectification and sampling with zeroorder hold are the first two steps in the demodulation process, which is then followed by low-pass filtering. An improvised method of signal acquisition circuit and associated signal processing technique are discussed in the study by Li et al, [22]. The rotating capacitor filter is a way to process signals that are based on the technology of phase-sensitive detection; it can separate the weak signal from the intense and wide-band background noise.…”

Section: Excitation Frequencymentioning

confidence: 99%

See 1 more Smart Citation

A Review on Non-Invasive Magnetic and Electric Field Excited Methods for Flow Characterisation of Incompressible Newtonian Low Conductive Liquids

Vadde

Kadambi

Channabasappa

2023

ARFMTS

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Monitoring the flow rate of low conductive fluid is critical in sectors such as waste, culinary, chemical, pharmaceutical, oil and gas, and power. The flow meter can be used to measure several parameters like flow rate range, fluid electrical conductivity, cost and the scenario of desired monitoring. The existing invasive flow sensors for monitoring the velocity of conductive fluid are often associated with undesirable attributes of being obstructive, prone to interference effects, corrosion, significant pressure reduction, and energy loss in pipe systems causing severe and long-term damage to pipes during installation. This paper presents a comprehensive survey of various non-invasive methods for characterizing low conductive fluid flow based on the sources of strong magnetic and electric fields. This review discusses fundamental insights for understanding the physical phenomenon in the generation of eddy currents, Lorentz force, and the formation of the electric double layer with pertinent illustrations and discussions. The review presented in this paper concludes that each non-invasive measurement technique has limitations based on the excitation source of either magnetic or electric fields. Different values of low conductivity of fluid flow and flow velocity have been considered in various studies to get an in-depth understanding of the capability of selected techniques so that their scope and versatility can be researched further. This paper also highlights that emerging technologies like cryostats with superconducting magnet systems, which unquestionably exceed the mass limitation, have become viable in applications such as Lorentz force velocimetry.

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Section: Excitation Frequencymentioning

confidence: 99%

Section: Excitation Frequencymentioning

confidence: 99%

A Review on Non-Invasive Magnetic and Electric Field Excited Methods for Flow Characterisation of Incompressible Newtonian Low Conductive Liquids

Vadde

Kadambi

Channabasappa

2023

ARFMTS

View full text Add to dashboard Cite

show abstract

“…However, when electromagnetic flow sensor measures slurry fluid, there is slurry noise problem, which is reflected on the frequent beating phenomenon of measurement signal due to interference. [13][14][15] Interference in slurry noise on the measurement signal will lead to measurement errors, which will adversely to affect the measurement accuracy and stability. Therefore, it is necessary to study the problem of slurry noise and take measures to reduce or eliminate its influence on the measurement.…”

Section: Problem Of Slurry Noisementioning

confidence: 99%

“…Literature 14 illustrates the mechanism of slurry noise: slurry noise is caused by the impact of a large number of solid particles in the slurry fluid on the measuring electrode of an electromagnetic flow sensor. The research in reference [15][16][17][18][19][20] shows that the power spectral density of slurry noise is inversely proportional to the frequency and has 1/f characteristic. Based on the 1/f characteristic of slurry noise, signal processing method is used primarily to overcome slurry noise at present.…”

Section: Research Status Of Problem Of Slurry Noisementioning

confidence: 99%

A study on structure improvement scheme of electromagnetic flow sensor for slurry flow measurement

Gao

2022

Measurement and Control

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A scheme to improve the structure of electromagnetic flow sensor is put forward in this paper, which can effectively solve the slurry noise problem when electromagnetic flowmeter measures slurry fluid. The electromagnetic flow sensor used for measuring slurry fluid has slurry noise interference in the measurement signal. At present, the method of increasing the excitation frequency of electromagnetic flow sensor is widely used to overcome slurry noise. However, high excitation frequency will lead to poor stability of zero point. In view of the shortcomings of existing methods, this paper studies the method of improving sensor structure to overcome slurry noise. Firstly, according to the mechanism of slurry noise, an improved scheme for the installation position of the measuring electrode of electromagnetic flow sensor is proposed, which can greatly reduce the probability of solid particles of slurry fluid colliding with the measuring electrode; Then, the relevant research results of bubble dynamics theory are applied to optimize the improvement scheme, and the improvement scheme is determined, through calibration, it is concluded that the improved sensor can reach the accuracy level of 1.0; Finally, through slurry measurement experiments, it is verified that the improved electromagnetic flow sensor can effectively overcome slurry noise.

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“…The output signal of the electromagnetic flow sensor used for measuring slurry fluid will frequently jump, which is shown as a random large jump signal. This phenomenon is called slurry noise [12][13][14][15].…”

Section: Introduction 1overview Of Slurry Noise Of Electromagnetic Fl...mentioning

confidence: 99%

A Combined Numerical-Experimental Study on the Noise Power Spectrum Produced by an Electromagnetic Sensor for Slurry Flow

Gao¹,

Jin²,

Liu³

2021

Fluid Dynamics &Amp; Materials Processing

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The signals generated by electromagnetic flow sensors used for slurry fluids are often affected by noise interference produced by interaction with the slurry itself. In this study, the power spectrum characteristics of the signal are studied, and an attempt is made to determine the relationship between the characteristics of the related noise and the velocity and concentration of the slurry fluid. Dedicated experiments are conducted and the related power spectrum curve is obtained processing the signal measured by the sensor with Matlab. Numerical simulations are also carried out in the frame of an Eulerian approach in order get additional insights into the considered problem through comparison with the experimental results. The following conclusions are drawn: (1) The intensity of noise is directly proportional to the number of solid particles colliding with the electrode of the electromagnetic flow sensor per unit time, and to the square of the average velocity of the flow layer near the pipe wall. (2) With an increase in the slurry noise intensity, the power spectrum curve shifts upward in the logarithmic coordinate system (and vice versa).

show abstract

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

Cited by 8 publications

References 25 publications

A Review on Non-Invasive Magnetic and Electric Field Excited Methods for Flow Characterisation of Incompressible Newtonian Low Conductive Liquids

A Review on Non-Invasive Magnetic and Electric Field Excited Methods for Flow Characterisation of Incompressible Newtonian Low Conductive Liquids

A study on structure improvement scheme of electromagnetic flow sensor for slurry flow measurement

A Combined Numerical-Experimental Study on the Noise Power Spectrum Produced by an Electromagnetic Sensor for Slurry Flow

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