What Is a Ground Penetrating Radar Survey?
GPR surveys (the radar's pulses — the reflections) map the subsurface non-destructively — the utilities (the locating), the voids (the detection), the rebar (the mapping), and the stratigraphy (the profiling). The survey: the antenna's frequency (the resolution vs. the depth), the grid (the coverage), and the interpretation (the hyperbola — the targets'). The subsurface's X-ray — the non-destructive.
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How GPR works
The pulses (the electromagnetic — the transmitted; the reflections — the interfaces; the hyperbola — the point targets'), the frequency (the high — the resolution; the low — the depth; the 250-1000 MHz — the range), and the soils (the clay's — the attenuation; the sand's — the penetration).
Applications
The utilities (the SUE — the QL-B; the locating), the concrete (the rebar — the mapping; the PT — the tendons; the thickness), the voids (the sinkhole — the detection; the grouting's verification), and the environmental (the USTs — the tanks; the plumes' — the indirect).
Survey and limits
The grid (the spacing — the target's; the orthogonal — the 3D), the calibration (the known — the depth's; the velocity), the interpretation (the geophysicist's — the experience), and the limits (the clay — the depth's; the saltwater — the attenuation; the confirmation — the potholing). The GPR is the screening — the intrusive verifying.
The bottom line
Use GPR (250-1000 MHz antennas on surveyed grids) to locate utilities, map rebar/tendons, and detect voids — confirm critical targets by potholing; clay and saltwater limit depth.
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