Features of process control in the structure of the nutation line for the formation of a mode for measuring flow parameters with magnetization inversion at the noise level

The problems that arise when conducting experiments using flows of liquid media, as well as during technical measurements of their parameters in various fields of human activity, are considered. The need for new research in the field of nuclear magnetic resonance is substantiated, which involves the use of liquid media flows to solve complex scientific and technical problems in which the use of measuring instruments operating on other physical phenomena is impractical. A new method for forming the structure of the nutation line at the noise level from the flow of a liquid medium with magnetization inversion has been developed and the features of controlling the processes of formation of this structure have been established. Experimental studies were carried out and the adequacy of using this mode for measuring liquid flow q was proven. New coefficients are proposed in the Bloch equations, which describe the movement of three magnetization components (Mx', My' and Mz') in a nutation coil in a fluid flow in a strong inhomogeneous field. For various parameters B0 and q, the structures of nutation lines were calculated. The minimum value of magnetic field inhomogeneity has been established, taking into account q and the parameters of the current medium, which must be ensured in the nutation coil location sector to form the line structure at the noise level. Theoretical calculations are compared with experimental data.