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The Development of a 2 GHz Air Launched Horn Antenna for High Resolution Pavement Imaging

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The Development of a 2 GHz Air Launched Horn Antenna for High Resolution Pavement Imaging

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    1. The Development of a 2 GHz Air Launched Horn Antenna for High Resolution Pavement Imaging

    2. RoadScan A complete GPR system for road inspection and analysis

    3. RoadScan What is it?

    4. RoadScan What can it do?

    7. RoadScan Raw Data – 1 GHz horn antenna

    8. RoadScan Processed Data – 1 GHz horn antenna

    9. RoadScan Entering ground truth

    10. RoadScan Working with results

    11. The 1 GHz horn antenna provided good results – capable of measuring wearing course thicknesses of greater than 2 in. However, there was a need for a higher resolution antenna to measure thin lift overlays. A 2 GHz horn antenna was developed to address this need.

    12. Data Collection Setup For Comparison Tests

    13. Side-by-Side Comparison 1 GHz & 2 GHz Horn Antenna Data

    14. Core IN 09 – 2 GHZ Horn Data Total core thickness 10.8-11.2 cm Clear reflection from pavement bottom, but weak reflection from wearing course, even though the wearing course separated from the rest of the core during drilling.Clear reflection from pavement bottom, but weak reflection from wearing course, even though the wearing course separated from the rest of the core during drilling.

    15. Resolution Comparison – Core IN 09 In 1 GHz data – interferes with strong reflector from pavement bottom.In 1 GHz data – interferes with strong reflector from pavement bottom.

    16. Core IN 10 – 2 GHZ Horn Data Total core thickness 7.7 - 8.2 cm

    17. Resolution Comparison – Core IN 10 The reflection from the wearing course is clearly evident in the 2 GHz horn antenna data.The reflection from the wearing course is clearly evident in the 2 GHz horn antenna data.

    18. Core IN 11 – 2 GHZ Horn Data Total core thickness 9.5-10.5 cm This is an interesting core where we have a complicated pavement structure. We cannot detect the wearing course from visual inspection of the core.This is an interesting core where we have a complicated pavement structure. We cannot detect the wearing course from visual inspection of the core.

    19. Resolution Comparison – Core IN 11

    20. Core IN 12 – 2 GHZ Horn Data Total core thickness 9.0 - 9.3 cm The wearing course reflection is clearly evident in the data.The wearing course reflection is clearly evident in the data.

    21. Resolution Comparison – Core IN 12 1 GHz horn can’t resolve strong reflection from the wearing course. It causes the reflection from the pavement bottom to be smeared.1 GHz horn can’t resolve strong reflection from the wearing course. It causes the reflection from the pavement bottom to be smeared.

    22. Core IN 13 – 2 GHZ Horn Data Total core thickness 8.9 cm

    23. Resolution Comparison – Core IN 13 Once again, the wearing course is not distinct in the 1 GHz horn antenna data, but is clearly evident in the 2 GHz horn antenna data.Once again, the wearing course is not distinct in the 1 GHz horn antenna data, but is clearly evident in the 2 GHz horn antenna data.

    25. Conclusions A 2 GHz horn antenna can be used to: map pavement wearing course thickness detect anomalies in pavement structure detect inner layers in pavement structure

    26. Future Research It is expected that the 2 GHz horn antenna will provide high quality data for bridge deck deterioration assessment. The 2 GHz operating frequency should provide resolution sufficient to isolate the reflections from the top rebar mesh from the concrete surface in bridge decks. This was not always possible using a 1 GHz horn antenna.

    27. GPR and the FCC Regulations

    28. GPR and the FCC Regulations

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