| 摘要 |
<p>A system for inspecting a pipeline (11) including a sensing portion (27), which has a transmitting antenna (20) and at least one receiving antenna (31) thereon. The sensing portion (27) is located adjacent to the pipeline (11) under inspection. The system also including a magnet (53), adjacent to the sensing portion (27), having poles (55, 57) located adjacent the pipeline (11). Poles (55, 57) provide a steady-state magnetic field in the pipeline (11). Cracks (e.g., 21) in the pipeline (11) can be detected by the receiving antenna (31) by sensing eddy currents induced by the transmitting antenna (29) and/or by sensing the magnetic flux leakage from the magnet poles (55, 57).</p> |
