Air inside the concrete results in a partial reflection of the GPR signal, which allows you to detect larger voids. Thin delamination and small...

Air inside the concrete results in a partial reflection of the GPR signal, which allows you to detect larger voids. Thin delamination and small voids only give a small reflection and can typically be visualized using GPR. Contrary to GPR, Ultrasound tomography results in a full reflection when interfacing air. This makes Ultrasound the ideal solution for investigation delaminations and small voids.