Yes, ultrasonic pulse echo is the correct technology for detecting voids, honeycombs, and delaminations below the rebar grid. Whereas a dense...

Yes, ultrasonic pulse echo is the correct technology for detecting voids, honeycombs, and delaminations below the rebar grid. Whereas a dense rebar structure will block a GPR signal from penetrating deeper into the structure, an ultrasonic pulse echo signal is only partially reflected. The signal that passes through is able to detect deeper-lying voids.