Description of Electromagnetic Induction (EMI) as an investigatory technique
The locator device contains two EM coil assemblies positioned at each end.
The first assembly generates a primary electromagnetic field that induces a current in the ground.
The secondary electromagnetic field created by this current is detected and measured by the coil assembly positioned at the opposite end of the instrument.
Data is stored in a PDA which is connected to the EMI device through a Bluetooth connection.
The terms “electromagnetic surveying,” “electromagnetic survey” and “geophysical electromagnetic surveying” are all synonymous with one another.
This method enables the detection of:
- Underground works (both metallic and non-metallic)
- Buried reservoirs
- Abandoned or active electrical duct banks
- Buried debris (both metallic and non-metallic)
- Ancient foundations
- Cavities and sinkholes
- Delineation of embankment edges
- All types of buried objects
Georadar-detection Inc.’s EMI locator
GEORADAR-Detection Inc. uses a powerful electromagnetic induction locator to carry out electromagnetic surveys.
This device, which is at the cutting-edge of specialist technology, features a unique calibration system and makes use of a separate interference canceling system
The device is therefore highly stable and provides consistent, uniform data.
Our device can be adapted to the specific characteristics of the terrain at each site and can use three different frequencies simultaneously.
EMI vs. Ground Penetrating Radar (GPR)
Like ground penetrating radar, electromagnetic induction can be used as a single source for geophysical surveys. EMI is particularly effective in surveying large swathes of ground to detect underground works, reservoirs, buried barrels or pollution, or in order to determine the edges of backfilled zones.
EMI can also be used for rapid reconnaissance to identify zones of interest over a large area, after which ground penetrating radar can be used to deal with any anomalies that may be detected.