Ground Penetrating Radar (GPR)
In Ground Penetrating Radar (GPR) surveys, electromagnetic waves of frequencies between 50MHz and 2.6GHz are transmitted into the ground or structure. The transmitted energy is reflected back to the surface when it encounters significant contrasts in dielectric properties.
With the wide range of antennae available, the GPR technique can be applied to numerous geological, environmental and engineering applications with investigation depths from a couple of centimetres to up to ~10mbgl. The data can be collected as a series of 1D soundings, 2D traverses, or in more complex situations as a 3D volume. With this dynamic versatility, the GPR technique can be applied in a wide variety of circumstances.
- Detecting underground storage tanks (USTs)
- Detecting buried pipes and services
- Mapping buried foundations and tunnels
- Concrete studies
- Mapping archaeological features and cemeteries
- Contamination and landfill extent mapping
- Mapping of shallow voids (geological and artificial)
- Stratigraphic mapping
- Detection of infilled materials
- Assessing subsurface heterogeneity
GPR is a non-destructive technique that emits a short pulse of electromagnetic energy that is radiated into the subsurface (whether into the ground or engineered structure). Large areas up to 1Ha can be covered in a single day using portable karts.