| 摘要 |
A pipeline inspection pig for locating crack-like defects (10) in pipeline walls (8) comprises at least one transmit transducer (T) for transmitting ultrasound energy into the pipeline wall (8), and at least one associated receive transducer (R) located adjacent the transmit transducer (T), the arrangement being such that, for a given defect (10) in the pipeline wall (8 ), ultrasound energy within the pipeline wall (8) is incident on the defect (10 ), part of said energy being reflected by the defect (10) back to the receive transducer (8) in the form of a first data stream, and the remainder of said energy passing through the defect (10) to be attenuated thereby and thence returned to the receive transducer (R) in the form of a second data stream, interpretation of the first and second data streams enabling the location of the defect (10) to be determined.
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