| 摘要 |
An apparatus for pipeline inspection includes a sensor unit having an array of ultrasonic sensors for inspecting a pipe wall. The sensor unit has a skid with an outer surface intended to run adjacent or in contact with a pipe wall. The sensors are mounted at a predetermined stand off from the outer surface of the skid. The ultrasonic sensors are mounted in a chamber filled with ultrasonic couplant (e.g. a liquid or gel), for permitting communication between the sensors and the inner surface of a pipe wall. The skid defines a membrane region over the sensors. The membrane region is intended to be pushed against an internal wall of a pipeline, and has a rigid periphery for maintaining a predetermined stand off between the outer surface of the skid and the upper surface of the sensors.
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