Ground Penetrating Radar by ScanMan

GPR is a geophysical method that uses radar pulses to image the subsurface. This non-destructive method uses electromagnetic radiation in the UHF/VHF frequencies of the radio spectrum, and detects the reflected signals from subsurface structures. GPR can be used in a variety of media, including rock, soil, ice, fresh water, pavements and structures. It can detect objects, changes in material, and voids and cracks.

GPR uses transmitting and receiving antennas. The transmitting antenna radiates short pulses of the high-frequency (usually polarized) radio waves into the ground. When the radio wave hits a buried object or a boundary with different dielectric constants, the receiving antenna records variations in the reflected return signal.

Optimal depth penetration is achieved in dry sandy soils or massive dry materials such as granite, limestone, and concrete where the depth of penetration could be up to 15m. In moist and/or clay laden soils and soils with high electrical conductivity, penetration is sometimes only a few centimeters.

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