Abstract
When the electromagnetic flowmeter (EMF) is applied to the industrial field, the effective flow signal of the electrode output is easily drowned out by the noise under the condition of strong noise and flow rate lower than 0.2 m/s. However the flow signal drowned out in strong noise cannot be measured accurately by traditional electromagnetic flow detection technology, which cannot separate signal and noise effectively. The correlation technology can be applied to select the reference signal with the same regularity as the target signal to separate the target signal and remove the noise. Firstly, researches on the correlation detection and the basic correlation theory of the electromagnetic flowmeter are carried out. Then, the design of the electromagnetic flow measurement system based on the theoretical research is completed. Finally, in order to verify the performance and accuracy of the designed flow measurement system, a test platform for electromagnetic flow detection is set up, and the verification experiments are implemented. The experiment results show that the electromagnetic flow measurement system based on the correlation theory can not only meet the requirements of traditional flow measurement but also have unique advantages in suppression of strong noise interference, slurry flow measurement, and low flow rate measurement.
Highlights
The electromagnetic flowmeter, an instrument to measure liquid flow, developed rapidly in the 1960s with the improvement of electronic technology [1]
This paper proposed an electromagnetic flow measurement system based on the correlation detection principle
The following conclusions can be drawn according to the analysis and tests mentioned above: 1) In the study of the correlation theory of electromagnetic flow measurement, a theoretical model of the electromagnetic flow-measurement based on correlation principle was created, and the electromagnetic flowmeter based on this model was designed
Summary
The electromagnetic flowmeter, an instrument to measure liquid flow, developed rapidly in the 1960s with the improvement of electronic technology [1]. As for an electromagnetic flowmeter with low frequency rectangular wave excitation, the voltage obtained from the electrodes contains an induction electromotive force that is proportional to the flow rate, and a variety of interference components, including power-line interference, differential interference, common mode interference, series mode interference and electro-chemical interference [19]. If the rectangular wave with the same frequency as the excitation wave is used as the reference signal, correlation detection technology can be used to remove the noise (including common mode interference, series mode interference and electrochemical interference) in the output signal of the electrodes effectively. N→0 where ωR is the angular frequency of the signal; τ is the delay time of the input signal relative to the excitation reference signal; Vam is the amplitude of the rectangular wave of the flow detection signal; n(t) is the noise interference in electrode output signal of electromagnetic flowmeter.
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