| 摘要 |
A device (10) for non-destructive inspection of elongated objects made of magnetic material such as metallic ropes, the device (10) including:
- a plurality of lateral yokes (12) including magnetic material, interconnected with each other, constituting an internal chamber where the elongated object (32) is intended to move longitudinally. The lateral yokes (12) support elements (23a, 23b) for generating a plurality of magnetic circuits between each lateral yokes (12) and the elongated object (32). First magnetic field sensor (21) are associated with the lateral yokes (12) to detect a first parameter (LMV) representative of the axial magnetic flux (¦4) coming from the elongated object (32) and passing through said lateral yokes (12). Second magnetic sensor elements (40) are located in an intermediate region (26) of said internal chamber to detect a second parameter (LF). The device (10) also includes a control unit (41) associated with the first magnetic field sensors (21) and the second magnetic field sensors (40) and provided for determining a third parameter (”x), indicative of a length of a defect in said elongated object (32) and determining a fourth parameter (LMA) indicative of the missing cross section of the elongated object (32) corresponding to said defect length on the basis of said first and third parameter (LMV, ”x).
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