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Abstract : Ground penetrating radar is a non destructive technique for evaluation of subsurface structures in earth, or concrete.
To sum that up, it lets us locate rebar, conduits, voids, and other features under the surface of the concrete.
It does this by broadcasting low wattage radio waves into the ground, and timing the reflections.
It is very similar to the way that fish finders work, except that it uses radio, where fish finders use sound.
In both cases, the return signal is timed very accurately, and the echoes are translated, and displayed visually, in a form that trained users can then interpret.
Radio waves travel around us constantly. They are in the air, in the earth, in electrical systems. They can penetrate surfaces that light(visible) cannot.
Please find the following attachments"Ground penetrating radar seminar report/pdf/ppt download" here...........
That is why you can use your cellular phone in a room with no windows.
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