title: Radar in non-destructive testing of thin granular dielectric layers
abstract: Ground-penetrating radar (GPR) is an electromagnetic probing and imaging method of subsurface which is applied in the non-destructive evaluation of roads and bridges as well. In Finland, the GPR is a commonly used quality control method for the air void content of newly laid asphalt pavements. The air void content has an effect on the long-term performance of the pavement. The GPR method is based on deriving the relative permittivity, or dielectric constant, from the reflected radar signal. The 
journal: Aaltodoc (Aalto University)