DBPapers
DOI: 10.5593/SGEM2015/B11/S1.027

GROUND OVERHAUSER DNP GEOPHYSICAL DEVICES

V. A. Sapunov, E. D. Narkhov, A. L. Fedorov, A. Sergeev, A. Y. Denisov
Tuesday 4 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 215-222 pp

ABSTRACT
The NMR technology is widely used in a proton precession magnetometers of the Earth magnetic field intended for geological and geophysical exploration. The main method used in the devices is the Packard & Varian free precession method. Considerable improvement of the modern proton magnetometers reached by using the Overhauser dynamic nuclear polarization (ODNP). In this report we present modern ground magnetometer designs including those developed in QM Laboratory. As examples, meteorite Chelyabinsk LL5 investigations and noncontact magnetic defectoscopy gas pipelines are reported.
Modifications of ODNP vector magnetometers measuring both the field module and the absolute field components are another ODNP application to in magnetometer methods for geophysical exploration, magnetic observatories and oil applications related to directional drilling purposes. It is based on the usage of special bias FC magnetic fields at precession signal pick up with a subsequent calculation of field component.
Other examples of application ODNP and NMR of low magnetic field include oil well logging and cores exploration in which Overhauser magnetometers provide stability of the spin echo signals in the conditions of an unstable Earth magnetic field.

Keywords: overhauser vector magnetometer, dynamic nuclear polarization, meteorite, oil gas pipeline defectoscopy

Home | Contact | Site Map | Site statistics | Visitors : 211 / 353063

Follow site activity en  Follow site activity GEOLOGY  Follow site activity Papers SGEM2015   ?

CrossRef Member    Indexed in ISI Web Of Knowledge   Indexed in ISI Web Of Knowledge
   

© Copyright 2001 International Multidisciplinary Scientific GeoConference & EXPO SGEM. All Rights Reserved.

Creative Commons License