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

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 ( B = 1 ) is reached. The equations for the linear fit of the relative error in the low induction number regime are also given.