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Method of liquid consumption measuring in nuclear magnetic flowmeters-relaxometers

https://doi.org/10.32446/0368-1025it.2023-11-58-65

Abstract

The need to expand the functionality of systems for monitoring the parameters of the flow of liquid media is substantiated. The advantages of using meters based on the phenomenon of nuclear magnetic resonance to control the parameters of the flow of liquid media are noted. Let us consider the problems that arise during the operation of nuclear magnetic flowmeters-relaxometers operating in two measurement modes (pulse and with periodic modulation of the magnetic field in the nuclear magnetic resonance signal recording system - modulation technique). It is noted that the main problem in the operation of these devices is associated with an increase in the error in measuring liquid flow or the termination of its measurement process with rapid changes in liquid flow. The use of a magnetic tag mode, which allows us to solve this problem, significantly limits the possibilities of using nuclear magnetic resonance flowmeters-relaxometers when used to monitor the parameters of other liquids or with a large increase in the temperature of the flowing medium. A method for creating a magnetic mark at the noise level for measuring liquid flow is proposed. In the method, changing the composition of the flowing medium (including the liquid itself) does not have a significant effect on the formation of a magnetic mark at the noise level in a strong inhomogeneous magnetic field. The results of experimental studies of the nutation line from changes in magnetic field inhomogeneity are presented. A mathematical model has been developed based on the modified Bloch equations and relationships between the magnetic field parameters have been established to implement the magnetic mark mode in the nuclear magnetic resonance signal with magnetization inversion at the noise level. The use of a method makes it possible to make the influence of rapid changes in the value of liquid flow (by a factor of 10 or more) on the flow measurement error insignificant.

About the Authors

Vadim V. Davydov
Peter the Great Saint Petersburg Polytechnic University; The Bonch-Bruevich State University of Telecommunication
Russian Federation

Vadim V. Davydov

St. Petersburg



A. A. Gol’dberg
Peter the Great Saint Petersburg Polytechnic University
Russian Federation

Artemiy A. Gol’dberg

St. Petersburg



V. I. Dudkin
The Bonch-Bruevich State University of Telecommunication
Russian Federation

Valentin I. Dudkin

St. Petersburg



R. V. Davydov
Peter the Great Saint Petersburg Polytechnic University; The Bonch-Bruevich State University of Telecommunication; Alferov University
Russian Federation

Roman V. Davydov

St. Petersburg



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For citations:


Davydov V.V., Gol’dberg A.A., Dudkin V.I., Davydov R.V. Method of liquid consumption measuring in nuclear magnetic flowmeters-relaxometers. Izmeritel`naya Tekhnika. 2023;(11):58-65. (In Russ.) https://doi.org/10.32446/0368-1025it.2023-11-58-65

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