Janice Hurley Trailor blog Ground Penetrating Radar

Ground Penetrating Radar

GPR (also known as radio detection and ranging) is a geophysical method for scanning the subsurface without disrupting it. It is a non-invasive and quick survey technique that can provide useful information in a variety of applications. GPR uses high-frequency pulsed electromagnetic waves to acquire subsurface information. The electromagnetic waves are transmitted from a transmitter antenna and are reflected off the subsurface interfaces or boundaries. The strength (amplitude) and the travel time of the reflected signals are used to construct a subsurface image. Read more:https://gpr-survey.uk

Reflecting interfaces may be natural (e.g., soil horizons, groundwater-surface, rock/ground interfaces), or man-made (e.g., buried pipes, rebar). The resulting reflections can be recorded by the transmitting and receiver antennas of a GPR system. The signals are processed and displayed on a graphic recorder. The recorded results are plotted as profiles, plan view maps isolating specific depths, or three-dimensional models of the ground.

The Advantages of Using Ground Penetrating Radar

The penetration depth of GPR is affected by the electrical conductivity of the scanned medium, the transmitted center frequency, and the radiated power. Increased conductivity decreases the electromagnetic wave attenuation, reducing the depth range of the instrument. GPR has been used to locate rebar, conduit, steam pipes, gas & oil lines, water & sewer lines and to resolve construction layer interfaces. The instrument is also capable of detecting voids, metal objects, and changes in the stratigraphy. GPR surveys can be carried out in a variety of environments and are safe to use, even when working near live electrical systems.

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