Abstract
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.
Highlights
The electromagnetic flowmeter (EMF) is a measurement apparatus based on Faraday’s law for measuring the volume flow of conductive liquids
The calibration method and results of the electromagnetic flowmeter based on differential correlation are introduced; the measurement accuracy of the instantaneous flow of the differential correlation detection electromagnetic flow measurement system is analyzed; according to tests under the conditions of external strong interference, slurry fluid, and low flow rate, the actual data are given and analyzed
In order to test the response of the differential correlation detection electromagnetic flowmeter to a low flow rate, after the system was fully preheated, its ability to detect a low flow rate was quantitatively analyzed
Summary
The electromagnetic flowmeter (EMF) is a measurement apparatus based on Faraday’s law for measuring the volume flow of conductive liquids. It is widely used in the petroleum and chemistry industries as well as in food and medicine manufacturing, and in sewage processing, channel flow measurement, and reservoir resource transfer [1,2,3]. The electromagnetic flowmeter has some advantages over other traditional flow measurement meters, such as having no movable parts that obstruct the flow; no pressure loss; and showing little influence of temperature, density, and pressure on the measurement of the conductive flow [4]. Since the traditional EMF cannot distinguish between the actual flow signal and interference noise, thereby only eliminating one type of interference, interference noise cannot be removed synchronously
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
