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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Disturbing Effect of a Magnetic Object on the Absolute Measurement of the Magnetic Field
by Egbai, J. C.

Ground magnetic surveys are carried out over small areas on a previously defined target. Many observations are spoiled by a magnetic object the observer is carrying while observing. It is not easy to estimate far away a magnetic object should be kept from the point of measurement. To investigate this, a theoretical formulation of the magnetic field for a small magnetic object in an external magnetic field was calculated having a look at the influence of an arbitrary shaped magnetic body at any point in space in the presence of an external field H. The nuclear precession (proton) magnetometer was used for the field work. An estimation of anomalies for given weight for round and elongated bodies was considered. The result shows distances for some common objects at which an anomaly is 1nT with safety pin having the least the distance of 0.6m and Autobus the highest distance of 76.0m. However, the best way of avoiding the disturbance due to a magnetic body is checking the surroundings of the measurement point with a proton magnetometer.
Keywords: magnetic survey, magnetometer, disturbance, magnetic object, magnetic body
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



Copyright © Journal of Emerging Trends in Engineering and Applied Sciences 2010