| 摘要 |
A pipeline inspection pig includes a drive mechanism, a first field generator and first sensor section connected to the drive mechanism and is driven thereby helically through the pipeline in a clockwise rotational direction. A second field generator and second sensor section is also connected to the drive mechanism and is driven thereby helically through the pipeline in a counterclockwise direction. A data recorder is operatively connected to the first sensor section and to the second sensor section for recording field interruption data from which a plot of anomalies in the pipeline can be generated as a grid of intersecting helical sensor signal pathways of the first and second sensors.
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