Abstract

The relative sensitivities of the active and reactive components of a harmonic field are considered as well as that of transient fields to changes in the resistivity and dimensions of a conducting body. It is shown that the active and reactive components of a harmonic field have different resolving capabilities and, as such, different signal/noise ratios. The resolving capabilities of time and frequency domain techniques are compared in both high and low frequency ends of the spectrum, as well as early and late stages of the transient. The useful signal and the 'geologic noise' are approximated by two conducting bodies immersed in an otherwise nonconducting medium.

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