GPR surveys detect the contrasts of dielectric constants of the ground materials to provide an image of the near subsurface and to detect objects, changes in material, voids and cracks in a fast and precise way. It can be used in a variety of media, including rock, soil, ice, fresh water, pavements and structures.
The depth range of GPR is limited by the electrical conductivity of the ground, by the transmitted center frequency and by the radiated power. As conductivity increases, the penetration depth decreases. Higher frequencies do not penetrate as far as lower frequencies, but give better resolution.
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