Studying the vibration behavior and relate individual frequency of induced sound waves and energy consumption of defects in Sonic Infrared Imaging

Sonic Infrared Imaging (SIR) technology is a novel NDE method in NDE family. This technology is capable of detecting surface and subsurface defects in metals, metal alloys, and composites. SIR combines ultrasonic excitation with IR imaging to give a quick detection response in the crack region by observing the temperature change on the structure surface. Nonlinearity phenomena in SIR occur in the coupling between the target and ultrasound transducer, where a single frequency driving excitation source produces sound waves containing multiple frequencies. This nonlinearity is critical in improving the probability of crack detection significantly. In this paper, we will present our study on nonlinearity in SIR with emphasis on the relationship between the frequency of the induced sound waves and their corresponding energy consumption level in the crack vicinity of samples.