DBPapers
DOI: 10.5593/SGEM2016/B13/S05.063

GEOMAGNETIC FIELD FAST-CHANGE MEASUREMENTS BY PROTON PRECESSION MAGNETOMETER

A. Nevsorov , A. Orlov
Tuesday 6 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-57-5 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 3, 499-504 pp

ABSTRACT
Aims of our research are increasing measurement accuracy of proton free-precession magnetometer for geomagnetic field and developing method of magnetic field fast dynamic estimation. For solving these problems we have developed a method of free induction decay processing. This method allows estimating independently amplitude, frequency and phase slow-varying dynamic. It based on parametric approach and analyzing sampled data. For the investigation of the proposed method, we created a dual-channel proton free-precession magnetometer which was used for measuring magnetic fields with different heterogeneity. The experiments shows that the proposed method of free induction decay processing exceeds the accuracy of the standard methods in several times. We achieved sensivity about 20 pT with 1 Hz bandpass in these experiments. We able to estimate magnetic Field fast dynamic at the transverse relaxation time. This result is useful for mineral exploration. The achieved results open the path to study such phenomena as Schumann resonances.

Keywords: free induction decay, geomagnetic measurement, magnetic field gradient