Table of Contents
ISRN Geophysics
Volume 2013 (2013), Article ID 720839, 4 pages
http://dx.doi.org/10.1155/2013/720839
Research Article

Error Analysis in Measured Conductivity under Low Induction Number Approximation for Electromagnetic Methods

1Observatório Nacional (ON), MCT, Rua General José Cristino 77, 20921-400 Rio de Janeiro, RJ, Brazil
2Universidade Federal do Pampa (UNIPAMPA), Avenida Pedro Anunciação s/n°, 96570-000 Caçapava do Sul, RS, Brazil
3Universidade Estadual do Rio de Janeiro (UERJ), Rua São Francisco Xavier 524, 20550-900 Rio de Janeiro, RJ, Brazil

Received 28 August 2013; Accepted 5 November 2013

Academic Editors: G. Chisham, A. De Santis, G. Mele, and A. Tzanis

Copyright © 2013 George Caminha-Maciel and Irineu Figueiredo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We present an analysis of the error involved in the so-called low induction number approximation in the electromagnetic methods. In particular, we focus on the EM34 equipment settings and field configurations, widely used for geophysical prospecting of laterally electrical conductivity anomalies and shallow targets. We show the theoretical error for the conductivity in both vertical and horizontal dipole coil configurations within the low induction number regime and up to the maximum measuring limit of the equipment. A linear relationship may be adjusted until slightly beyond the point where the conductivity limit for low induction number () is reached. The equations for the linear fit of the relative error in the low induction number regime are also given.