Materials with a high dielectric are very conductive and thus attenuate the signal rapidly.
Materials with a high dielectric are very conductive. This means that a pulse which moves from dry san d to wet sand will produce a very strong, brilliantly visible reflection, w hile one moving from dry sand to limestone will produce very weak reflections. The strength, or amplitude, of the reflection is determined by the contrast in the dielectric constants of the two materials. Reflections are produced whenever the energy pulse enters into a material with different electrical conduction properties (dielectric permittivity) from the material it left. A series of pulses over a single area make up what is called a scan.
GPR works by sending a tiny pulse of energy into a material and recording the strength and the time required for the return of any reflected signal. Ground Penetration Radar (GPR) has been used to locate the soil characteristics, water table depth, depth of bedrock, buried utilities and cavities below the ground surface.
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