Antennas for pavement void detection by scattering


Pennock, S. R. and Jenks, C. H. J., 2015. Antennas for pavement void detection by scattering. In: 8th International Workshop on Advanced Ground Penetrating Radar, IWAGPR 2015, 2015-07-07 - 2015-07-10. IEEE.

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Voids and cracks in asphalt or concrete can indicate the condition of a road or pavement. A decaying road may contain many very small cracks, and such small artifacts can be difficult to identify using conventional ground penetrating radar (GPR) techniques. A new approach is examined here to detect the scattering from the multitude of small defects in the ground. Consideration is given to the layout of suitable antennas to sensitise a GPR system to the laterally propagating cross-polarised signals that voids in a road will produce. A self-shielded antenna with a circularly symmetrical beam pattern is used to transmit vertically downwards. This is surrounded by a number of wide band dielectric wedge directional antennas, oriented to pick up the cross-polarisation of the scattered signal. The two antenna types and their groundplane configuration have reduced direct path coupling and therefore maximise system sensitivity. Tests over asphalt slabs with 7% and 3% changes in density and porosity show that quite significant changes in signal level make such changes in porosity detectable.


Item Type Conference or Workshop Items (UNSPECIFIED)
CreatorsPennock, S. R.and Jenks, C. H. J.
Related URLs
DepartmentsFaculty of Engineering & Design > Electronic & Electrical Engineering
ID Code50143


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