An identification method of bonding state in ETIS based on GPR

The external thermal insulation system (ETIS) often has safety quality problems caused without debonding, and the classical debonding detection methods can not achieve high precision and high efficiency safety detection at the same time. Ground penetrating radar (GPR) can be one of the most efficient tools to identify the bonding state. In this paper, a methodology for bonding state detection is presented. Firstly, a modeling and simulation method for ETIS is designed, which is closer to the real form of the adhesive shape. Secondly, a 3D frequency wave-number domain filter is used to remove the low-rank direct-coupled waves and the low-frequency components, then a matched filter is used to estimate the time delay arrival and identify the adhesive shape in ETIS. Finally, the effectiveness of the algorithm for the recognition of bonding state is verified by numerical results and experiments.