Wavelets application in acoustic emission signal detection of wire related events in pipeline
Keywords:Acoustic emission testing, Acoustic emissions, Acoustic fields, Acoustic signal processing, Acoustics, Applications, Embedded systems, Extraction, Feature extraction, Fourier transforms, Industrial applications, Integrated circuits, Mathematical transformations, Nondestructive examination, Photoacoustic effect, Pipelines, Signal detection, Signal processing, Testing, Acoustic emission (AE), Acoustic emission (AE) signals, Acoustic signals, Applied (CO), Common problems, Engineering fields, Frequency-domain (FD), Global informations, Local information, Non-destructive test (NDT), Physical features, Pipeline inspection, processing methods, Short-time Fourier transform (STFT), time scaling, Time-frequency distribution (TFD)
AbstractAs a popular nondestructive test, acoustic emission (AE) testing has been widely used in many physical and engineering fields such as leak detection and pipeline inspection. Among those applied AE tests, a common problem is to extract the physical features of the ideal events, so as to detect similar signals. In acoustic signal processing, those features can be represented as joint time-frequency distribution. However, classical signal processing methods only give global information on either time or frequency domain, while local information is lost. Although the short-time Fourier transform (STFT) is developed to analyze time and frequency details simultaneously, it can only achieve limited precision. Wavelet transform is a time-scale-frequency technique with adaptable precision, which makes better feature extraction and detail detection. This paper is an. application of wavelet transform in acoustic emission signal detection where strong noise exists. Developed for industrial applications, the techniques presented are both accurate and computationally implementai for embedded systems. In addition, STFT is compared with wavelet transform to show the advantages of wavelet transforms in this particular application.
How to Cite
Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i) to publish, reproduce, distribute, display and store the Contribution;
ii) to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii) to exploit all subsidiary rights in the Contribution,
iv) to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v) to licence any third party to do any or all of the above.