Monitor
GPR transmitter/
receiver unit
Trench
1
2
The GPR transmitter
emits pulses of electromagnetic energy into the subsurface
Objects or disturbances in the soil reflect patterns of energy back to the GPR receiver
Operator makes
multiple passes
over search grid
Water pipe
3
4
Different materials vary in their resistance to the electric field, to return distinct signals
The GPR receiver detects and records these variations for interpretation
Monitor
Operator makes
multiple passes
over search grid
GPR transmitter/
receiver unit
Trench
Water pipe
1
2
3
4
The GPR transmitter
emits pulses of electromagnetic energy into the subsurface
Objects or disturbances in the soil reflect patterns of energy back to the GPR receiver
Different materials vary in their resistance to the electric field, to return distinct signals
The GPR receiver detects and records these variations for interpretation