It’s a device that allows underground analysis in search for heterogeneous zones. Thanks to an antenna system able to emit towards the ground some radar waves to be reflected on the possible obstacles and then return back to the device, we obtain an image of the elements that constitute the ground until 2m depth.

This non-destructive process does not influence the technical, chemical or mechanical characteristics of the encountered networks.

All types of piping are detectable: Duct or wire cables, plastic duct (PEHD, PVC), concrete buzzards, clay buzzards, technical gutters…

It also detects the non-visible structures :

• Buried rooms,
• Deep cuts,
• Underground cavity,
• Paved zones,
• Woven-wires…

The Geo Radar consists of 4 antennas assembled up in a parallel way covering a total width of about 2 metres.
The device may be used in rural and urban areas, under the condition of working on a surface ground that is relatively uniform.
The best conditions of acquiring the data are obtained by dry weather (puddles create screen-zones for the radar waves).

The Geo Radar is composed of a rolling wagon to which are fixed:

• Antennas (700 or 2000 MHz)
• An encoder wheel to calibrate the radar files
• A central processing unit containing the software of acquiring the data
• Batteries
• A display unit allowing to pilot the software and to make a direct visualization of radar images in real-time

After been acquired, all the data is emptied from the GEORADAR and transferred to a computer equipped with the interpretation software.
The operator chooses suited filters for an optimal reading of the got back images, and then interprets the results on 4 radar bands.
All the impact zones (probable or sure) are the object of a color computing marking in the screen.

The interpretation software allows restoring the results under one of the following forms:

• A summary table of the detected obstacles under EXCEL format
• An AUTOCAD file allowing the superimposing of the detected network tracks on a geo- referenced existing plan

This process allows the handling of approximately 800 metres of linear work per day and per team in urban zones, which is in fact a precious ally for civil engineering companies worried of quickly deploying their networks by securing at most their construction operations.