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Electromagnetic (EM) methods are able to identify subsoil structures of different electrical conductivity. A sender coil induces an electromagnetic eddy current into the ground. Conductive objects and structures respond with the generation of secondary electrical fields which interfere with the sender field. The entire resulting field (intensity and phase) is measured by a receiver coil.
Ground conditions of a low general conductivity are especially appropriate for the purpose of metal detection.
Based on the needed penetration depth the frequency range of the excitation has to be chosen. The type of measuring device (e.g. EM31, EM34 or EM61) depends on this frequency range.
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