Dynamic Synchronous Capture Algorithm for an Electromagnetic Flowmeter

Fanjiang, Yong-Yi; Lu, Shih-Wei

doi:10.3390/s17040821

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…The accuracy of the electromagnetic flowmeter is mostly unaffected by sediment concentration in muddy water irrigation. This is also related to the advantages that the electromagnetic flowmeter has, e.g., no moving parts or throttle valve parts and the fluid flow will not be blocked [19,20], which is consistent with the conclusion obtained by Lu et al [17] based on the definition of the muddy water head and theoretical analysis. The conclusion is that the electromagnetic flowmeter is not affected by liquid pressure, temperature, viscosity, density or conductivity, so it can be used to measure the muddy water flow rate.…”

Section: Discussionsupporting

confidence: 90%

“…Electromagnetic flowmeters, ultrasonic flowmeters and mechanical water meters are three commonly used pipeline metering devices. The principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction [19]. The conductive liquid flows in the magnetic field and cuts the magnetic induction lines, so that the voltage signal can be sensed by electrodes located on the flow pipe walls [20] and form the output circuit of voltage and current and, finally, the speed of water can be calculated [21].…”

Section: Introductionmentioning

confidence: 99%

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Accuracy and Reliability Analysis of Pipe Irrigation Metering Device for Sandy Water Source

Jiao

Jiang

et al. 2021

Water

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Sandy water sources are widely distributed and are important for agricultural development. However, no explicit result has been achieved in the research of the accuracy and reliability of pipeline metering devices as well as flow rate measurement objects (water or water–sand) of different metering devices in the process of pipelines conveying muddy water. In this study, seven kinds of sediment concentration gradients, C0–C6 (0.2–7.19%), and three different flow velocities (1.0 m/s, 1.25 m/s, 1.5 m/s) were set up, and a comparison measuring method was used to compare the flow values of three kinds of metering device (electromagnetic flowmeter, ultrasonic flowmeter and water meter) with a right triangle weir. The accuracy and reliability of the metering device were obtained by analyzing the change law of the relative error between each metering device and the right triangle weir under different flow velocities and different sediment concentrations, and the flow rate measurement objects of each metering device were finally clarified. The relative error between the electromagnetic flowmeter and right triangle weir decreased gradually with the increase in the flow velocity when the sediment concentration was constant. The maximum difference of the relative error between the electromagnetic flowmeter and the right triangle weir was 2.53% when the flow velocity was constant. Additionally, the minimum differences of the relative errors of the ultrasonic flowmeter and water meter were 2.67% and 6.90%, respectively. The measured flow law of the electromagnetic flowmeter was more in line with the measured flow law of the water–sand mixture measured by the right triangle weir. However, the relative errors of water and water–sand measured by the ultrasonic flowmeter and water meter fluctuate greatly, which does not accord with the law of muddy water measured by the right triangle weir. The results showed that the electromagnetic flowmeter has the best reliability among the three metering devices, and the accuracy can be improved by calibration before use or increasing the flow velocity of the pipe network. Under the sand grading used in this study, the electromagnetic flowmeter was recommended to measure the flow rate of pipe irrigation for sandy water sources in this paper.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Accuracy and Reliability Analysis of Pipe Irrigation Metering Device for Sandy Water Source

Jiao

Jiang

et al. 2021

Water

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“…Currently, scholars from all over the world carry out studies on the inter-electrode signals of the EMF [20][21][22][23][24][25]. According to the different mechanisms, these signals can be classified into three categories.…”

Section: Analysis Of the Inter-electrode Interference Of The Electromagnetic Flowmetermentioning

confidence: 99%

Study on a New Electromagnetic Flow Measurement Technology Based on Differential Correlation Detection

Chen

Tian

et al. 2020

Sensors

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Under the conditions of low flow rate and strong noise, the current electromagnetic flowmeter (EMF) cannot satisfy the requirement for measurement or separate the actual flow signal and interference signal accurately. Correlation detection technology can reduce the bandwidth and suppress noise effectively using the periodic transmission of signal and noise randomness. As for the problem that the current anti-interference technology cannot suppress noise effectively, the noise and interference of the electromagnetic flowmeter were analyzed in this paper, and a design of the electromagnetic flowmeter based on differential correlation detection was proposed. Then, in order to verify the feasibility of the electromagnetic flow measurement system based on differential correlation, an experimental platform for the comparison between standard flow and measured flow was established and a verification experiment was carried out under special conditions and with flow calibration measurements. Finally, the data obtained in the experiment were analyzed. The research result showed that an electromagnetic flowmeter based on differential correlation detection satisfies the need for measurement completely. The lower limit of the flow rate of the electromagnetic flowmeter based on the differential correlation principle could reach 0.084 m/s. Under strong external interferences, the electromagnetic flowmeter based on differential correlation had a fluctuation range in output value of only 10 mV. This shows that the electromagnetic flowmeter based on the differential correlation principle has unique advantages in measurements taken under the conditions of strong noise, slurry flow, and low flow rate.

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