Sensors & Software CONQUEST 100, User Manual

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Conquest 100 Principles of Operation
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2 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 objects within the material. The concept is shown
in Figure 2-1.
Figure 2-1:The Conquest Sensor Head transmits GPR signals into concrete and collects the signals that reflect from
rebar, conduits and other targets embedded inside.
2.1 Line Scans Crossing Targets Perpendicularly
Conquest detects rebar and conduits which are generally rod-like in shape. The sensor should
cross perpendicular to the long axis of the feature, i.e. it should cross the feature at 90° (Figure
2-2). When the sensor crosses a target, the result is th
e typical “hyperbolic” or inverted “V”
response. The point (apex) of the hyperbola gives the position and depth of the feature, as
shown in Figure 2-3.
Figure 2-2: The red arrow represents the path of the sensor, crossing the rebar or conduit at 90°.