DBPapers
DOI: 10.5593/SGEM2015/B11/S1.004

A GRADIENT TOLERANCE MEASUREMENT METHOD OF BOREHOLE OVERHAUSER MAGNETOMETER LOM-2 IN LABORATORY CONDITION

V.Sapunov, E. Narkhov,A. Denisov, T. Wu, X. Cao
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, 29-36 pp

ABSTRACT
Results of QMLab and BGIF joint measurements of gradient tolerance of the LOM-2 borehole proton overhauser magnetometer are presented in the report.
The short description of the LOM-2 magnetometer developed QMLab and planned to co-production and develop the Chinese market by BGIF is presented. The basic technical parameters as following: sensitivity 0.2-0.5nT at the 1-3 seconds cycle of measurements and gradient tolerance up to 30000 nT/m. Working size of Overhauser sensor is Ø30*30 mm. Borehole shell diameter is 42 mm.
The special attention is given to gradient tolerance parameter, which was defined as border of sharp decrease in sensitivity of measurements (up to 100 times) at preservation of working reliability of measurements (up to 20-200 nT RMS comprehensible to the geological purposes at 30000 nT/meter gradient).
The gradient tolerance measurements were conducted in a laboratory magnetic field standard, the standard has a geomagnetic range. The standard of magnetic field is based on a four-layers permalloy shielding and an internal solenoid coil.
The measurement technique is based on continuous measurement the magnetic field and calculate it’s root mean square deviations (RMS) along the axis of standard magnetic field of inhomogeneous area and that magnetic field distribution along the axis were calibrated in advance.

Keywords: proton magnetometer, gradient tolerance, borehole geophysics

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