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Georadar (GPR)

Engineering projects, rural field planning, archaeological research, among others, often need to use the GPR Method for subsurface research, in order to map:

  • Metallic pipes, pipes, electrical cables, utilities in general;
  • Plastic drums;
  • Contaminants in the water table;
  • Fossils;
  • Buried objects;
  • Fuel tanks;
  • among others.

The GPR Method basically works according to the illustrations in the figures on the side. For example, if there is a metal tube in subsurface, it can be identified as described in Figure 2.

  1. an electromagnetic wave is emitted by the GPR transmitter;
  2. the wave travels through the medium until it is reflected by the material change (in the case of the figures, from the ground to the metallic barrel),;
  3. generation of the reflected wave, which is captured by the GPR receiver.;
  4. this investigative process continues in a linear sense as the operator moves the GPR equipment to the surface..
Curva tempo x amplitude do sinal de GPR.
Figure 1 - Time x amplitude curve of the GPR signal.
Source: UNITRACC.com
Ilustração simplificada da operação do GPR
Figure 2 - Simplified illustration of GPR operation when emitting electromagnetic wave in the subsoil; and this is reflected by a metal barrel.
Source: UNITRACC.com

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