A Nutation Nuclear-Magnetic Teslameter for Measuring Weak Magnetic Fields

Давыдов, В. В.; Velichko, Elena; Dudkin, V. I.; Karseev, A. Yu.

doi:10.1007/s11018-014-0519-8

Cited by 56 publications

(16 citation statements)

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“…[4][5][6]8,9 The value of the induction B in this device is determined by the gyromagnetic ratio of the proton γ p and frequency f n of the nuclear resonance. 4,[8][9][10][11][12] The contact between the induction and to previously submitted values is determined by the relation…”

Section: Formulation Of the Problemmentioning

confidence: 99%

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Nuclear-resonance magnetometer with flowing liquid for superstrong inhomogeneous fields measuring

Давыдов

Dudkin

Vologdin

2016

Int. J. Mod. Phys. Conf. Ser.

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Multichannel nuclear-resonance magnetometer for remote monitoring of induction and heterogeneity of a magnetic field in different areas inside and near a charged particle accelerator is considered. The maximal distance between the nuclear magnetic resonance signal detector and the magnetometer is 50 m. Measurement error is 0.5%, sensitivity of the magnetometer is 10 −10 T/Hz 1/2 , measurement time of the magnetic field parameters in 24 control points is no more than 4 minutes.

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Section: Formulation Of the Problemmentioning

confidence: 99%

“…[4][5][6][8][9][10][11][12] This change of orientation M p after of liquid passage the connecting sections pipeline 6 and the flow switch 4 is fixed of NMR signal registration coil 10. The coil 10 is a part the newly developed generator circuit vibrations weak (autodyne) which located in the registration device 11.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Nuclear-resonance magnetometer with flowing liquid for superstrong inhomogeneous fields measuring

Давыдов

Dudkin

Vologdin

2016

Int. J. Mod. Phys. Conf. Ser.

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“…In cases in which at least one of conditions (3) and/or the condition for inhomogeneity of constant magnetic field H 0 is not satisfied, it is impossible to determine the shape of the nutation line (with satel lites) in RF modulated magnetic field H 0 for improve ment of the accuracy of physical measurements in NMR magnetometers, flowmeters, and relaxometers.…”

Section: Equations Of Motion Of the Nuclear Magnetization Vector Of Amentioning

confidence: 99%

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confidence: 99%

Equations of motion of the nuclear magnetization vector of a flowing liquid in a modulated magnetic field of a nutation coil

2015

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At present, flowmeters based on nuclear magnetic resonance (NMR) are finding numerous applications in atomic power engineering (monitoring of cooling systems), in technologies employing aggressive chem ical media (e.g., acids and alkali) and biological solu tions (under sterile conditions), and in the petro chemical industry [1][2][3][4]. An important advantage of NMR flowmeters in comparison to other types con sists in the absence of a contact between the measuring system and flowing liquid. Another advantage is the possibility of measuring liquid flow rate q online. These devices require no preliminary calibration and ensure high precision of measurements (with errors within 0.3-0.4%) [1,[5][6][7]. The possibility of opera tion in the relaxometer mode, which is achieved by introducing additional electronics without changing the magnetic system design and flow circuit scheme, is an additional advantage. In this regime, it is possible to measure the relaxation constants of a flowing medium and, hence, to monitor changes in its state and/or physical conditions in the system (e.g., presence of impurities, temperature variations, etc.) [4][5][6]8].Instruments (magnetometers, spectrometers, flow meters, relaxometers, etc.) based on the phenomenon of NMR in flowing fluids employ the dependence of the measured response signal (nutation line) on amplitude H 1 and/or frequency ω n of the radio fre quency (RF) field in the nutation coil [4][5][6][7][8][9]. Once the mechanism of formation of the nutation line is known, it is possible to develop new measuring techniques and improve the design of instruments so as to increase their metrological characteristics.The aforementioned high precision of measuring flow rate q by NMR label flowmeters is achieved due to large slope S n of the nutation line [4][5][6][7][8][9]. However, rapid variation of q in the flowing liquid medium, especially in the case of a nutation line with large S n , can lead to changes in the amplitude and phase of the NMR response signal that will result in increasing error of measurement (in practice, up to 5%). This problem is especially topical in the case of measure ment of small flow rates q. We have solved this problem by arranging a nutation coil in the field between poles of a permanent magnet with induction B 0 = 0.038 T and inhomogeneity 1.4 × 10 -2 cm -1 , which was mod ulated by an RF magnetic field. Under the action of this modulating field, the nutation line exhibited broadening and acquired a comblike structure consist ing of satellite lines with various amplitudes and widths, which resembled the phenomenon of para metric resonance in optically oriented atoms [10][11][12][13]. By selecting proper parameters of the modulation field, it was possible to reduce the amplitude of satel lites down to a noise level. This result allowed the NMR label flowmeter to operate in a new regime of measurements from a preset U c to 0 (where U c is the amplitude of NMR signal at H 1 = 0, while "zero" in the inverted NMR signal corresponds to the labeled liquid)...

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“…When operating nuclear power plants (NPPs) of various capacities, several tasks arise. One of them is the creation of control and monitoring systems that ensure the stable operation of equipment operating in continuous mode at nuclear power plants [25][26][27][28][29][30][31][32]. And to provide reliable remote control of various systems and units of the station, for example, when the station is decommissioned, or in the "conservation" mode of a nuclear reactor [6,9,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

New high-speed system for controlling the parameters of a nuclear reactor in a nuclear power plant

et al. 2019

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The necessity of modernizing current control systems for functional units of a nuclear power plant, as well as the development of new control systems with a high degree of reliability and speed, is substantiated. The advantages of using optical sensors and fiber-optic communication lines to solve these problems are noted. Cases for which it is necessary to develop new fiber-optic sensors for monitoring parameters, for example, the flow of coolant or feed water, are considered. In some of them, it is more expedient to use standard designs of fiber-optic sensors to control the operating parameters of various blocks, for example, to control the electric field strength. A device and a control scheme for the parameters of the units and systems of a nuclear power plant using fiber-optic communication lines have been developed. The results of measuring various parameters of a nuclear reactor are presented. They showed that our proposed fiber-optic control and monitoring system for nuclear power plants operates more reliably and efficiently than systems with analogue control and measurement channels. The use of fiber-optic systems allows real-time remote control and high-speed control in terms of issuing commands to devices. This is very important when servicing a nuclear power plant while it is operating in extreme conditions.

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A Nutation Nuclear-Magnetic Teslameter for Measuring Weak Magnetic Fields

Cited by 56 publications

References 1 publication

Nuclear-resonance magnetometer with flowing liquid for superstrong inhomogeneous fields measuring

Nuclear-resonance magnetometer with flowing liquid for superstrong inhomogeneous fields measuring

Equations of motion of the nuclear magnetization vector of a flowing liquid in a modulated magnetic field of a nutation coil

New high-speed system for controlling the parameters of a nuclear reactor in a nuclear power plant

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