2D Ground Penetrating Radar

Two-Dimensional Ground Penetrating Radar (GPR) is the most commonly used method for scanning concrete to locate embedded items. During this process, a technician makes multiple passes over the concrete surface with the GPR machine. This device features a transmitter located at the rear, which sends radio waves into the concrete. As these waves penetrate the material, they interact with any embedded objects, causing some of the signals to reflect back. A receiver at the front of the machine captures these reflected signals and converts them into data that the GPR technician can analyze.

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The technician interprets this data by examining hyperbolas displayed on the screen. This allows them to determine the presence of embedded items, their depth within the concrete, and the general width of each item. Using a cursor, the technician realigns the cart to the center of the identified items and marks their locations on the concrete surface. Although some information from the scan can aid in identifying these items, there is no definitive way to ascertain their exact identify using GPR alone. Instead, the items are marked based on the identifying characteristics of the hyperbolas observed. Items that appear out of place or appear differently than nearby items are indicated as conflict items as their identities cannot be determined.