GPR – See What Lies Below
Ground Penetrating Radar reveals buried utilities, voids and layer boundaries non-destructively. Choose antenna frequencies for either depth or detail—perfect for construction, asset surveys and diagnostics.
- Non-invasive detection of utilities, structures & anomalies
- 2D profiles & 3D volumes from parallel survey lines
- Frequency options (e.g., ~200–250 MHz, ~400 MHz, ~700–900 MHz, ≥1.2 GHz)
- Immediate field results with export for analysis & reporting
- Rugged systems for road, site and off-road work
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How GPR works
Short EM pulses are transmitted into the ground. Material contrasts reflect energy back to the antenna. From travel time and amplitude, profiles show objects and stratigraphy.
Frequencies & use cases
- ~200–250 MHz: greater penetration (in suitable soils), lower resolution—routes, larger targets.
- ~400 MHz: balanced choice for utility locating and meter-scale depths.
- ~700–900 MHz: high detail for dense corridors, concrete & near-surface.
- ≥1.2 GHz: very high resolution for shallow targets and structural assessment.
Soil conditions
Dry sand & rock allow deeper penetration. High conductivity (wet clay, saline soils) attenuates the signal. Practical depth strongly depends on site conditions.
Typical applications
- Utility & route mapping (power, telecom, pipelines)
- Layer thicknesses, backfill, voids, washouts
- Concrete inspection (rebar/layout), pavement evaluation
- 3D datasets for asset records & documentation
Selection guide
- Target size: small targets → higher frequency; deeper targets → lower frequency.
- Ground: account for soil conductivity and moisture.
- Deliverable: quick 2D profiles vs. dense 3D grids.
- Handling: handheld, push-cart or vehicle-mounted depending on area and speed.
FAQ
- How deep can GPR see?
- From decimeters (high frequency) to several meters (low frequency, favorable soils), depending on conditions.
- Does GPR replace transmitter/receiver locating?
- It complements classic methods—especially for non-metallic targets or unknown alignments. Combining methods is most reliable.
- Are depth readings accurate?
- Yes with proper velocity calibration; otherwise depths are relative estimates.
- Does GPR work in wet conditions?
- Wet, clay-rich soils attenuate signals. Adjust frequency/setup or consider alternatives if needed.