Concrete inspection is performed using a GPR computer connected to an ultra high frequency radio antenna (1.5GHz). The equipment transmits radio waves through the concrete and digitally records reflections, which graphically represent concrete thickness, rebar, pipes, and cavities.  Two-dimensional cross-sections are generated on site in real time.  Three-dimensional models can be generated by post-processing the survey data.

 

 

 

GPR profile indicating rebar in concrete (above right hyperbolic reflection) and possible pipe (below left hyperbolic reflection) below the concrete slab.