НИЛ Квантовой Магнитометрии
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
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The article discusses the effect of cylindrical shielding shells on the uniformity of the magnetic field created by coil sources used in measures of low-field induction. Calculations were carried out to adjust the parameters of such sources in order to increase the homogeneity of the magnetically shielded system field.
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This paper presents a hardware-software solution to the problem of studying and controlling the amplitude-time characteristics of the nuclear precession signal of the working substance of the Overhauser sensors of POS-1 magnetometers. The aspects of development are considered: the technical task for the test bench, the hardware design of the device, its general functionality and its software components. Also presented are some results of studies conducted on the stand, demonstrating its efficiency and accuracy.
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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.
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One of the most real factors of geological exploration optimization is low-altitude Earth remote sensing that includes geophysical prospecting methods. This article describes a case of the efficient application of complex low-altitude UAV-based aerogeophysical surveying during greenfield prospecting for gold in greenfield localized in the Western Sayan mountains (Russia). 90 sq. km site characterized by extremely complicated landscape and terrain conditions as well as controversial views on its geological conditions. Surveys from a multirotor UAV (unmanned aircraft vehicle) were made with terrain flowing and included a simultaneous magnetic and gamma-ray radiometric surveying as well as gamma-ray spectrometry by the ‘static hovering’ method and multispectral photogrammetry. The articles sets forth main principles of the method applied as well as demonstrates the advantages of unmanned aircraft technologies vs. traditional geophysical prospecting methods, i.e. high performance and low costs even in those conditions when ground and aerial surveys are economically impractical or entirely impossible. Application of low-altitude UAV-surveys allowed for a large-scale geological and geophysical mapping involving low costs, for clearing up a controversial point of the site geological conditions and for planning further prospecting, while avoiding erroneous solutions prompted by wrong priori assumptions about a geological structure of the site.
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Представлены результаты использования абсолютного веркторного магнитометра POS-4, основанного на методе переключения подмагничивающего поля. Прибор разработан в лаборатории Квантовой магнитометрии УрФУ и опробован на нескольких геомагнитных обсерваториях в сети INTERMAGNET. Благодаря высокой абсолютной точности и стабильности имеется хорошая перспектива использования и внедрения таких оверхаузеровских компонентных магнитометров на долговременных пунктах наблюдения векового хода геомагнитного поля и автономных магнитных обсерваториях. Магнитометр POS-4 может быть использован в качестве опорной базовой магнитного станции для поддержки направленного бурения нефтяных и газовых скважин. Обсуждаются основные погрешности измерений и демонстрируется многолетний опыт в испытаниях на магнитной обсерватории Арти (Урал).
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The results of measurements by Overhauser vector magnetometer POS-4 carried out for one year and a half are presented. The accuracy, stability and reliability are evaluated.
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.
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We tested the full-gradient magnetometer’s system of two ortho oriented Overhauser with a GPS receiver in shallow water. Our investigations show that this is a promising layout prototype of magnetometer measuring complex, designed for high-precision 3D detecting and studying of underwater man-made objects. With such a system, and the existing set of techniques and software we can be able to reliably map and identify anomalies created by such objects, solving the problem of their locations within a small part of meter.
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Increased sensitivity and resolution of geophysical instruments significantly enhances the effectiveness of non-destructive investigation methods for standard geological problems and allows new experiments. We suggest to use modern highly sensitive scalar magnetometers for identification and study of geological and artificial low-contrast objects in a magnetic field. We present application results of a modern nuclear precession magnetometer POS based on the processor Overhauser sensor. The device is developed and produced by the Quantum Magnetometry Laboratory, Ural Federal University, Yekaterinburg, Russia. Experiments conducted in the laboratory and observatories allowed to determine the device absolute accuracy of 0.5 nT and sensitivity of 0.02 nT, and to confirm its operability in large magnetic field gradients. This sensitivity is sufficient for detection of magnetic field changes caused, for example, by tectonomagnetic, seismomagnetic, piezomagnetic effects and electrokinetic phenomena in the geological environment. We conducted field experiments comparing POS magnetometers metrological characteristics with similar instruments from Scintrex and Geometrics. The results confirm measurement high stability in long-term observations of the magnetic field change due to geodynamic processes. We tested POS instruments in various geophysical applications, including prospecting and exploration of minerals (placer and ore gold, hydrocarbons, kimberlites); identification of ferromagnetic objects in cover environments; archaeological sites mapping. Our latest experience adds to this list a magnetic survey for pipeline inspection purposes. In addition, we discuss application of a novel absolute 3-component magnetometer POS-4based on a principle of bias field switching method. The device was tested at several INTERMAGNET geomagnetic observatories. Due to high absolute accuracy and stability, there is a good prospect of implementing these magnetometers at observation points of long-term geomagnetic field secular variation and in autonomous magnetic observatories
Создано / Изменено: 13 апреля 2020 / 17 апреля 2020
© ФГАОУ ВО «УрФУ имени первого Президента России Б.Н. Ельцина»
Дизайн портала: Artsofte
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