Pipeline inspection apparatus and method
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United States of America Patent
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Jun 19, 2012
Grant Date -
Feb 24, 2011
app pub date -
Nov 5, 2008
filing date -
Jan 11, 2008
priority date (Note) -
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Abstract
Ultrasonic pipeline inspection apparatus which utilizes two different wave modes (e.g. a horizontally polarized shear mode and a symmetric Lamb wave mode) to discriminate different defect types by comparing corresponding signals collected from defects. EMATs may detect the signals. The detected amplitudes of the collected signals from both wave modes are compared to calculate a ratio, which may be compared with a distribution of ratio values for known defects to evaluate the type of defect detected. The apparatus may be a sensor module mountable on a pipeline vehicle and having a plurality of sensors distributed around its periphery.
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