Ultrasonic nondestructive evaluation (NDE) is widely used for detecting flaws in oil pipelines. The backscattering noise may attain peak values greater than the sought flaw pulse. For improving the signal-to-noise ratio (SNR) and extracting a flaw echo corrupted by noise, a resonance demodulation technique and a resonance filter are proposed. The impulse response of the resonance filter can be represented as a superposition of Gaussian echoes. The analysis results show that this approach is more effective in extracting the information of a small flaw during pipeline NDE. The amplitude envelope of the processed ultrasonic signal after envelope detection obtains a notable SNR enhancement.
Ultrasonic flaw detection during NDE of oil pipelines via a resonance filter
Ultraschall-Fehlernachweis bei der ZfP von Ölpipelines mittels Resonanzfilter
Russian Journal of Nondestructive Testing ; 42 , 6 ; 398-403
2006
6 Seiten, 6 Bilder, 8 Quellen
Article (Journal)
English
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