Study of submarine pipeline corrosion based on ultrasonic detection and wavelet analysis

Pipeline inspection is an important means of Oil and Gas Pipeline defect detection; it plays an important role in the protection of the safe operation of pipelines. Ultrasonic detection technology becomes the main pipe online detection method, because of the advantages of its fast speed, reliability, economy and doesn´t require strip layer penstock. In ultrasonic flaw detection process ultrasonic signal usually is a center frequency modulation of broadband pulse signal, this is a time-frequency limited amount of non-stationary signal, wavelet analysis is a new mathematical method and data processing tool to analyze non-stable signals. This article on seabed pipeline corrosion conditions detection and the first part of the difficulty of collecting data, using the combination of hardware and software to solute the online ultrasonic thickness data and location data synchronization acquisition problems in this paper, Secondly, in LABVIEW software by fully utilizing Wavelet analysis method for multiple reflection on ultrasonic pulse-echo power spectrum for extraction, and through experiment illustrates that this method is accurate and reliable in the extraction of ultrasound on the peak information, it also laid the foundation of pipeline defect identification and location.