1.
Ultrasonics
; 85: 31-38, 2018 Apr.
Artigo
em Inglês
| MEDLINE
| ID: mdl-29310943
RESUMO
A pulse compression technique has been developed for the non-destructive testing of concrete samples. Scattering of signals from aggregate has historically been a problem in such measurements. Here, it is shown that a combination of piezocomposite transducers, pulse compression and post processing can lead to good images of a reinforcement bar at a cover depth of 55â¯mm. This has been achieved using a combination of wide bandwidth operation over the 150-450â¯kHz range, and processing based on measuring the cumulative energy scattered back to the receiver. Results are presented in the form of images of a 20â¯mm rebar embedded within a sample containing 10â¯mm aggregate.