Review of Signal Processing in Ultrasonic Guided Waves Nondestructive Testing

Modern signal processing has been playing an more important role in ultrasonic guided waves of nondestructive testing and evaluation. To demonstrate how to improve the readability of guided waves signal and enhance the ability of defection identification, a review and comparisons of some methods including timefrequency representations, wavelet analysis, Hilbert-Huang transforms, and cross-correlation techniques and so on have been carried out.