Principles Of Operation - Sensors & Software Conquest Series Manual

Conquest
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Principles of Operation

The Conquest system uses ground penetrating radar (GPR) technology to image concrete and
other similar materials (soil, rock, asphalt, etc.). GPR systems emit a high frequency radio wave
pulse and detect the echoes that return from within the material. The concept is shown in Figure
4-1.
Figure 4-1:The Conquest sensor head transmits GPR signals into concrete and collects the signal that
reflects from rebar, conduits and other targets embedded inside.
The GPR display shows signal amplitude versus depth (time) and sensor position along a line.
This is called a "Line Scan". The echo sounder and fish finder used on boats operate in an
analogous fashion as indicated in Figure 4-2.
GPR is just like a fish finder &
echo sounder
• sends out a ping
• signal scattered
back from fish
• signal scattered
back from bottom
• in this example
single record has 2
blips at different
times
Figure 4-2:GPR is conceptually similar to a fish finder.
The fish finder record
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4-Principles of Operation
• as the boat moves -
collect recordings
• display the
recordings side by
side
• the result looks
like a cross section
through the water