Research on Feature Extraction for Flaw Ultrasonic Echo Based on Wavelet Pack Analysis

Provided by: International Association of Computer Science & Information Technology (IACSIT)
Topic: Networking
Format: PDF
Non-Destructive Testing (NDT) is the technology of using the characteristics of sound, light and magnetic to detect all kinds of physical properties and organization of metal components without any damage to them in order to identify the defects of surface and inner of them. With the development of NDT technology, ultrasonic wave is used to detect the bonding defects of metal thin composite plate by more and more people because of its advantage of greater penetration and higher sensitivity. This paper applies wavelet analysis as the tool of processing signals to extracting features and proposes a new method of filtering based on the traditional wavelet soft and hard threshold filtering algorithm.

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