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Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF / VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures.
Often a Sensors & Software 1000 MHz GPR unit is used to scan concrete for rebar, cables, pipe, and post tension cables.