Concrete Thickness Measurement Model for GPR

The data processing of concrete thickness inspection frequently has unknown electrical properties of the concretes or it varies over the observation. This paper proposes measurement model for concrete thickness by using GPR which permittivity is estimated from obtained GPR data and then it is used to interpret the layer thickness. Experimental investigation was performed by modeling the GPR system using VNA. The proposed measurement model utilizes surface reflection information to estimate the relative permittivity of the concrete. To ensure that the surface reflection signal is well recognized, the antenna is placed on a concrete surface with a certain elevation. The laboratory experiment results show that the proposed measurement model is able to estimate the thickness of the concrete with good results.