Electromagnetics

Electromagnetics

The Electromagnetic method is based on the induction of electrical currents in subsurface conductors by electromagnetic waves which are generated on the surface. Applications include mapping seepage through dams, levees, pipelines, or containment walls.  It can also be used to delineate the edges of landfills or to detect buried objects such as utilities, rebar-reinforced concrete structures, or underground storage tanks.

Frequency-Domain Electromagnetics (FDEM)

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The Frequency Domain Electromagnetics (FDEM) method is based on the induction of electrical currents in subsurface conductors by electromagnetic waves generated at the surface.

Test for:

  • Bulk Ground Conductivity
  • Buried Metal
  • Lateral changes in soil type or saturation

Time-Domain Electromagnetics (TDEM)

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The Time Domain Electromagnetic (TDEM) method is based on the induction of electrical currents in subsurface conductors by electromagnetic waves which are generated on the surface.

Test for:

  • Buried Metal
  • Mapping Geologic Structures (i.e. Vertical Fractures)