Frequency Domain EM

Frequency Domain Electromagnetics (FDEM)

Frequency Domain Electromagnetics, commonly know as a ground conductivity meter survey, measures the electrical conductivity of the near surface. A transmitted alternating current, with an EM frequency (single or variable) generates a primary magnetic field which induces very small eddy currents in the subsurface. The eddy currents generate a secondary magnetic field whose interaction between the primary magnetic field and the receiver coil generates a voltage that is related to the “apparent” electrical conductivity of the subsurface. 

Frequency Domain EM method has been applied to numerous applications:

• Mapping and monitoring groundwater pollution

• Aquifer/Aquitard mapping

• Mapping Saline intrusions

• Sand and gravel mapping

• Mapping near surface chemical contamination

• Assessment of ground remediation

• Mapping buried foundations

NSGeo Imaging Inc. offers the following Frequency Domain EM services:

• FDEM survey consultancy

• FDEM processing and interpretation