GPR wave dispersion for material characterization

This paper studies the dispersion of GPR wave’s phase velocity at different wideband frequencies in plywood and concrete with varying moisture content. study makes use two antennas 2 GHz centre frequency operating wide angle reflection refraction (WARR) mode computation spectral analysis surface wave (SASW). Computation velocities is based on acquisition cross-power spectrum unwrap distorted ground waves positions closer to farther away from transmitting antenna. The are found experience greater low regimes within effective bandwidths determined thresholded by time–frequency (TFA) coherence plotting waves. validates not only methodology, but also identifies optimal distance between first (Rx1) second (Rx2) receivers as λ/2, which a fixed transmitter (Tx) minus receiver distance. It serves an indication changeable separation when other lower used because distances Tx-Rx1 Rx1-Rx2 wavelength dependent thus dependent. Effects contents chloride contamination were characterized according plots that traelling much decelerated than higher frequencies. research contributes building “GPR-WARR machine” suggested Annan Jackson (2017) [1], effects can be inversely modelled characterize variations material properties infrastructure means detecting damage.