Vladimir A Sapunov | Ural Federal University (original) (raw)

Papers by Vladimir A Sapunov

Marine Technologies 2019, 2019

NSG2021 27th European Meeting of Environmental and Engineering Geophysics, 2021

The modernization of a commercial magnetometer produced by the Ural Federal University for use in... more The modernization of a commercial magnetometer produced by the Ural Federal University for use in aeromagnetic exploration is presented. New special Overhauser sensors with a weight of up to 400 grams (diameter 50, length 105 millimeters) with a new working substance, providing Heisenberg hyperpolarization in quantum spin exchange, were used. The tests were carried out on the basis of the DJI 600 Pro industrial copter at a weakly magnetic test site. An object in the form of a 2-ton car was used. Sensitivity up to 0.03 nT/meter with magnetic card accuracy up to 1 nT (0.05 nT/meter) at copter speeds of 5-10 meters/sec with suppression of the gyroscopic effect of the proton sensor was demonstrated.

PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2019): Proceedings of the VI International Young Researchers’ Conference, 2019

We present comprehensive investigation of Overhauser dynamic nuclear polarization in solutions of... more We present comprehensive investigation of Overhauser dynamic nuclear polarization in solutions of the nitroxide radical TANO at high-frequency saturation field of electron paramagnetic resonance transitions with its parallel orientation, related to the static magnetic field up to 0.1 mT. Experimental observation requires specific technique of cycle-polarized application, which is described in detail. It was shown, that these results cannot be interpreted in terms of standard theoretical methods, taking into account the electron magnetic relaxation as conditioned by hyperfine isotropic interaction of NO fragment. We suggest an original description of the effect, based on consideration of the anisotropic hyperfine interaction, modulated by rotational diffusion of the NO fragment. Thus developed theoretical approach enables to determine the combined contribution of isotropic and anisotropic interactions and investigate the rotational diffusion process, which can serve as fundamental basis for a new branch of studying regarding molecular diffusion of the spin labels.

Little-known aspects of overhauser DNP at zero and low magnetic fields stimulated by parallel electron pumping of nitroxide radicals solutions, 2019

We present comprehensive investigation of Overhauser dynamic nuclear polarization in solutions of... more We present comprehensive investigation of Overhauser dynamic nuclear polarization in solutions of the nitroxide radical TANO at high-frequency saturation field of electron paramagnetic resonance transitions with its parallel orientation, related to the static magnetic field up to 0.1 mT. Experimental observation requires specific technique of cycle-polarized application, which is described in detail. It was shown, that these results cannot be interpreted in terms of standard theoretical methods, taking into account the electron magnetic relaxation as conditioned by hyperfine isotropic interaction of NO fragment. We suggest an original description of the effect, based on consideration of the anisotropic hyperfine interaction, modulated by rotational diffusion of the NO fragment. Thus developed theoretical approach enables to determine the combined contribution of isotropic and anisotropic interactions and investigate the rotational diffusion process, which can serve as fundamental basis for a new branch of studying regarding molecular diffusion of the spin labels.

THE VIII INTERNATIONAL YOUNG RESEARCHERS’ CONFERENCE – PHYSICS, TECHNOLOGY, INNOVATIONS (PTI-2021)

Contributions to Geophysics and Geodesy

Some of the principal experimental and theoretical results concerning metrological parameters of ... more Some of the principal experimental and theoretical results concerning metrological parameters of proton and Overhauser magnetometers are studied. In particular, the effect of operating modes, processing algorithms, a sensor design and registration path on the absolute and random errors of geomagnetic field is discussed. The methods of testing and metrological certification used by the laboratory in producing magnetometers are considered in this repot. In particular, simplest laboratory testing, testing by means of special laboratory standard based on a magnetic shield and the certification with a reference magnetometer under conditions of magnetic field standard are described. The measurement systematic error resulted from the thermoelectromotive generated at the polarization or in the presence of temperature gradient is shown for proton and Overhauser sensors. Methods for this defect removal are offered

V.A. Sapunov 1, *, A.Y. Denisov 1, D.V. Saveliev 1, А.A. Soloviev 2, 3, S.Y. Khomutov 4, P.B. Bor... more V.A. Sapunov 1, *, A.Y. Denisov 1, D.V. Saveliev 1, А.A. Soloviev 2, 3, S.Y. Khomutov 4, P.B. Borodin 5, E.D. Narkhov 1, А.V. Sergeev 1, A.N. Shirokov 1 1 Ural Federal University, Quantum Magnetometry Laboratory, Mira 21, Ekaterinburg 620002, Russia 2 Geophysical Center, RAS, Molodezhnaya 3, Moscow 119296, Russia 3Schmidt Institute of Physics of the Earth, RAS, B. Gruzinskaya 10, Moscow 123242, Russia 4 Institute of Cosmophysical Research and Radio Wave Propagation, FEB RAS, Mirnaya 7, Kamchatskiy Kray, Paratunka 684034, Russia 5 Geophysical Observatory "Arti", Institute of Geophysics, UB RAS, Geofizicheskaya 2a, Sverdlovskaya oblast, Arti 623341, Russia *E-mail: vasapunov@urfu.ru

Earth, Planets and Space, 2006

A method for calculating quality estimation of the magnetic field value measured by proton-preces... more A method for calculating quality estimation of the magnetic field value measured by proton-precession magnetometers from data of single measurement is presented. This method is appropriate for frequency measurement algorithms which process time-series of signal’s zero crossing. Expressions for measurement error estimation are obtained taking into account signal decay and correlated noise. Presented formulas allow a result reliability to be estimated immediately in single measurement and give an opportunity for complex control of a device performance. Correlation and relaxation corrections are given. It was experimentally tested that the standard deviation of measurements is in a good qualitative agreement with presented error estimation.

EPJ Web of Conferences

The results of practical use of a POS-4 vector magnetometer, developed by the Research Laboratory... more The results of practical use of a POS-4 vector magnetometer, developed by the Research Laboratory of Quantum Magnetometry, UrFU (Yekaterinburg) and based on POS Overhauser sensors, are presented. Continuous measurements by POS-4 have been carried out at the Paratunka observatory (IKIR FEB RAS, Kamchatka) since 2015, were done at the Saint Petersburg observatory (GC RAS / IZMIRAN SPb Branch, Leningrad Region) in 2017-2018 and have been performed at the Arti observatory (Institute of Geophysics, UB RAS, Sverdlovsk Region) since 2020. On the new high-latitude observatory White Sea (IAGA code WSE, GC RAS / MSU, Nikolai Pertsov White Sea Biological Station , Karelia), POS-4 is used as a main variometer for magnetic measurements. In April 2019, the magnetometer was successfully used for field measurements on ice during the TRANSARCTIC expedition in the Barents Sea (AARI, Roshydromet). At the beginning of 2021 IZMIRAN started testing two POS-4 magnetometers at the Moskow observatory. Accor...

This paper covers same results of the research directed at developing an absolute vector proton m... more This paper covers same results of the research directed at developing an absolute vector proton magnetometer POS-4 based on the switching bias magnetic fields methods. Due to the high absolute precision and stability magnetometer POS-4 found application not only for observatories and to directional drilling support of oi and gas well. Also we discuss the some basic errors of measurements and discuss the long-term experience in the testing of magnetic observatories ART and PARATUNKA.

This paper covers same results of the research directed at developing an absolute vector proton m... more This paper covers same results of the research directed at developing an absolute vector proton magnetometer POS-4 based on the switching bias magnetic fields methods. Due to the high absolute precision and stability magnetometer POS-4 found application not only for observatories and to directional drilling support of oi and gas well. Also we discuss the some basic errors of measurements and discuss the long-term experience in the testing of magnetic observatories ART and PARATUNKA.

The choice of the signal processing method may improve characteristics of the measuring device. W... more The choice of the signal processing method may improve characteristics of the measuring device. We consider the measurement error of signal processing regression methods for a quasi-harmonic signal generated in a frequency selective device. The results are applied to analyze the difference between the simple period meter processing and regression algorithms using measurement cycle signal data in proton-precession magnetometers. Dependences of the measurement error on the sensor quality factor and frequency of nuclear precession are obtained. It is shown that regression methods considerably widen the registration bandwidth and relax the requirements on the magnetometer hardware, and thus affect the optimization criteria of the registration system

This report covers results of the long-term research directed at developing an absolute vector pr... more This report covers results of the long-term research directed at developing an absolute vector proton magnetometer based on the switching of bias magnetic fields. The distinctive feature is the attempt of the installation of a miniature Overhauser sensor and optimized Garret solenoid directly on the telescope of the theodolite. Thus this design (Declination Inclination Modulus Overhauser magnetometer: DIMOVER) will complement the universally recognised DIflux absolute device by adding full vector measurement capability. Preliminary designs, which also can be interesting to the experts in vector proton magnetometers, are presented.

A method for calculating quality estimation of the magnetic field value measured by proton-preces... more A method for calculating quality estimation of the magnetic field value measured by proton-precession magnetometers from data of single measurement is presented. This method is appropriate for frequency measurement algorithms which process time-series of signal's zero crossing. Expressions for measurement error estimation are obtained taking into account signal decay and correlated noise. Presented formulas allow a result reliability to be estimated immediately in single measurement and give an opportunity for complex control of a device performance. Correlation and relaxation corrections are given. It was experimentally tested that the standard deviation of measurements is in a good qualitative agreement with presented error estimation.

Some of the principal experimental and theoretical results concerning metrological parameters of ... more Some of the principal experimental and theoretical results concerning metrological parameters of proton and Overhauser magnetometers are studied. In particular, the effect of operating modes, processing algorithms, sensor design and registration path on the absolute and random errors of geomagnetic field is discussed. The methods of testing and metrological certification used by the laboratory in producing magnetometers are considered in this report. In particular, the simplest laboratory testing, testing by means of special laboratory standard based on a magnetic shield, and the certification with a reference magnetometer under the conditions of standard magnetic field are described. The measurement systematic error resulting from the thermoelectromotive force generated at the polarization or in the presence of a temperature gradient is shown for proton and Overhauser sensors. Methods for this defect removal are offered.

Marine Technologies 2019, 2019

NSG2021 27th European Meeting of Environmental and Engineering Geophysics, 2021

The modernization of a commercial magnetometer produced by the Ural Federal University for use in... more The modernization of a commercial magnetometer produced by the Ural Federal University for use in aeromagnetic exploration is presented. New special Overhauser sensors with a weight of up to 400 grams (diameter 50, length 105 millimeters) with a new working substance, providing Heisenberg hyperpolarization in quantum spin exchange, were used. The tests were carried out on the basis of the DJI 600 Pro industrial copter at a weakly magnetic test site. An object in the form of a 2-ton car was used. Sensitivity up to 0.03 nT/meter with magnetic card accuracy up to 1 nT (0.05 nT/meter) at copter speeds of 5-10 meters/sec with suppression of the gyroscopic effect of the proton sensor was demonstrated.

PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2019): Proceedings of the VI International Young Researchers’ Conference, 2019

We present comprehensive investigation of Overhauser dynamic nuclear polarization in solutions of... more We present comprehensive investigation of Overhauser dynamic nuclear polarization in solutions of the nitroxide radical TANO at high-frequency saturation field of electron paramagnetic resonance transitions with its parallel orientation, related to the static magnetic field up to 0.1 mT. Experimental observation requires specific technique of cycle-polarized application, which is described in detail. It was shown, that these results cannot be interpreted in terms of standard theoretical methods, taking into account the electron magnetic relaxation as conditioned by hyperfine isotropic interaction of NO fragment. We suggest an original description of the effect, based on consideration of the anisotropic hyperfine interaction, modulated by rotational diffusion of the NO fragment. Thus developed theoretical approach enables to determine the combined contribution of isotropic and anisotropic interactions and investigate the rotational diffusion process, which can serve as fundamental basis for a new branch of studying regarding molecular diffusion of the spin labels.

Little-known aspects of overhauser DNP at zero and low magnetic fields stimulated by parallel electron pumping of nitroxide radicals solutions, 2019

We present comprehensive investigation of Overhauser dynamic nuclear polarization in solutions of... more We present comprehensive investigation of Overhauser dynamic nuclear polarization in solutions of the nitroxide radical TANO at high-frequency saturation field of electron paramagnetic resonance transitions with its parallel orientation, related to the static magnetic field up to 0.1 mT. Experimental observation requires specific technique of cycle-polarized application, which is described in detail. It was shown, that these results cannot be interpreted in terms of standard theoretical methods, taking into account the electron magnetic relaxation as conditioned by hyperfine isotropic interaction of NO fragment. We suggest an original description of the effect, based on consideration of the anisotropic hyperfine interaction, modulated by rotational diffusion of the NO fragment. Thus developed theoretical approach enables to determine the combined contribution of isotropic and anisotropic interactions and investigate the rotational diffusion process, which can serve as fundamental basis for a new branch of studying regarding molecular diffusion of the spin labels.

THE VIII INTERNATIONAL YOUNG RESEARCHERS’ CONFERENCE – PHYSICS, TECHNOLOGY, INNOVATIONS (PTI-2021)

Contributions to Geophysics and Geodesy

Some of the principal experimental and theoretical results concerning metrological parameters of ... more Some of the principal experimental and theoretical results concerning metrological parameters of proton and Overhauser magnetometers are studied. In particular, the effect of operating modes, processing algorithms, a sensor design and registration path on the absolute and random errors of geomagnetic field is discussed. The methods of testing and metrological certification used by the laboratory in producing magnetometers are considered in this repot. In particular, simplest laboratory testing, testing by means of special laboratory standard based on a magnetic shield and the certification with a reference magnetometer under conditions of magnetic field standard are described. The measurement systematic error resulted from the thermoelectromotive generated at the polarization or in the presence of temperature gradient is shown for proton and Overhauser sensors. Methods for this defect removal are offered

V.A. Sapunov 1, *, A.Y. Denisov 1, D.V. Saveliev 1, А.A. Soloviev 2, 3, S.Y. Khomutov 4, P.B. Bor... more V.A. Sapunov 1, *, A.Y. Denisov 1, D.V. Saveliev 1, А.A. Soloviev 2, 3, S.Y. Khomutov 4, P.B. Borodin 5, E.D. Narkhov 1, А.V. Sergeev 1, A.N. Shirokov 1 1 Ural Federal University, Quantum Magnetometry Laboratory, Mira 21, Ekaterinburg 620002, Russia 2 Geophysical Center, RAS, Molodezhnaya 3, Moscow 119296, Russia 3Schmidt Institute of Physics of the Earth, RAS, B. Gruzinskaya 10, Moscow 123242, Russia 4 Institute of Cosmophysical Research and Radio Wave Propagation, FEB RAS, Mirnaya 7, Kamchatskiy Kray, Paratunka 684034, Russia 5 Geophysical Observatory "Arti", Institute of Geophysics, UB RAS, Geofizicheskaya 2a, Sverdlovskaya oblast, Arti 623341, Russia *E-mail: vasapunov@urfu.ru

Earth, Planets and Space, 2006

A method for calculating quality estimation of the magnetic field value measured by proton-preces... more A method for calculating quality estimation of the magnetic field value measured by proton-precession magnetometers from data of single measurement is presented. This method is appropriate for frequency measurement algorithms which process time-series of signal’s zero crossing. Expressions for measurement error estimation are obtained taking into account signal decay and correlated noise. Presented formulas allow a result reliability to be estimated immediately in single measurement and give an opportunity for complex control of a device performance. Correlation and relaxation corrections are given. It was experimentally tested that the standard deviation of measurements is in a good qualitative agreement with presented error estimation.

EPJ Web of Conferences

The results of practical use of a POS-4 vector magnetometer, developed by the Research Laboratory... more The results of practical use of a POS-4 vector magnetometer, developed by the Research Laboratory of Quantum Magnetometry, UrFU (Yekaterinburg) and based on POS Overhauser sensors, are presented. Continuous measurements by POS-4 have been carried out at the Paratunka observatory (IKIR FEB RAS, Kamchatka) since 2015, were done at the Saint Petersburg observatory (GC RAS / IZMIRAN SPb Branch, Leningrad Region) in 2017-2018 and have been performed at the Arti observatory (Institute of Geophysics, UB RAS, Sverdlovsk Region) since 2020. On the new high-latitude observatory White Sea (IAGA code WSE, GC RAS / MSU, Nikolai Pertsov White Sea Biological Station , Karelia), POS-4 is used as a main variometer for magnetic measurements. In April 2019, the magnetometer was successfully used for field measurements on ice during the TRANSARCTIC expedition in the Barents Sea (AARI, Roshydromet). At the beginning of 2021 IZMIRAN started testing two POS-4 magnetometers at the Moskow observatory. Accor...

This paper covers same results of the research directed at developing an absolute vector proton m... more This paper covers same results of the research directed at developing an absolute vector proton magnetometer POS-4 based on the switching bias magnetic fields methods. Due to the high absolute precision and stability magnetometer POS-4 found application not only for observatories and to directional drilling support of oi and gas well. Also we discuss the some basic errors of measurements and discuss the long-term experience in the testing of magnetic observatories ART and PARATUNKA.

This paper covers same results of the research directed at developing an absolute vector proton m... more This paper covers same results of the research directed at developing an absolute vector proton magnetometer POS-4 based on the switching bias magnetic fields methods. Due to the high absolute precision and stability magnetometer POS-4 found application not only for observatories and to directional drilling support of oi and gas well. Also we discuss the some basic errors of measurements and discuss the long-term experience in the testing of magnetic observatories ART and PARATUNKA.

The choice of the signal processing method may improve characteristics of the measuring device. W... more The choice of the signal processing method may improve characteristics of the measuring device. We consider the measurement error of signal processing regression methods for a quasi-harmonic signal generated in a frequency selective device. The results are applied to analyze the difference between the simple period meter processing and regression algorithms using measurement cycle signal data in proton-precession magnetometers. Dependences of the measurement error on the sensor quality factor and frequency of nuclear precession are obtained. It is shown that regression methods considerably widen the registration bandwidth and relax the requirements on the magnetometer hardware, and thus affect the optimization criteria of the registration system

This report covers results of the long-term research directed at developing an absolute vector pr... more This report covers results of the long-term research directed at developing an absolute vector proton magnetometer based on the switching of bias magnetic fields. The distinctive feature is the attempt of the installation of a miniature Overhauser sensor and optimized Garret solenoid directly on the telescope of the theodolite. Thus this design (Declination Inclination Modulus Overhauser magnetometer: DIMOVER) will complement the universally recognised DIflux absolute device by adding full vector measurement capability. Preliminary designs, which also can be interesting to the experts in vector proton magnetometers, are presented.

A method for calculating quality estimation of the magnetic field value measured by proton-preces... more A method for calculating quality estimation of the magnetic field value measured by proton-precession magnetometers from data of single measurement is presented. This method is appropriate for frequency measurement algorithms which process time-series of signal's zero crossing. Expressions for measurement error estimation are obtained taking into account signal decay and correlated noise. Presented formulas allow a result reliability to be estimated immediately in single measurement and give an opportunity for complex control of a device performance. Correlation and relaxation corrections are given. It was experimentally tested that the standard deviation of measurements is in a good qualitative agreement with presented error estimation.

Some of the principal experimental and theoretical results concerning metrological parameters of ... more Some of the principal experimental and theoretical results concerning metrological parameters of proton and Overhauser magnetometers are studied. In particular, the effect of operating modes, processing algorithms, sensor design and registration path on the absolute and random errors of geomagnetic field is discussed. The methods of testing and metrological certification used by the laboratory in producing magnetometers are considered in this report. In particular, the simplest laboratory testing, testing by means of special laboratory standard based on a magnetic shield, and the certification with a reference magnetometer under the conditions of standard magnetic field are described. The measurement systematic error resulting from the thermoelectromotive force generated at the polarization or in the presence of a temperature gradient is shown for proton and Overhauser sensors. Methods for this defect removal are offered.