| 摘要 |
-20- An eddy current sensor assembly (50, 53, 100, 300, 400, 500, 600, 700) of a magnetic inspection device (52) is for nondestructive detection of structural faults in an elongated magnetically permeable object, such as a pipe. The sensor assembly has an auxiliary magnet including first and second auxiliary magnetic poles (64, 66) oppositely polarized relative to each other and spaced from,one another for positioning and movement longitudinally relative to an elongated magneticall y permeable object to be tested. The auxiliary magnet is to be interposed between primary magnets (54, 56) of the magnetic inspection device. A ferromagnetic member (62) couples the first and second auxiliary magnetic poles. Compliant pole pieces (55) such as magnetically permeable brushes are coupled to the auxiliary poles and are to be interposed between the auxiliary poles and the object to be inspected. An eddy current sensor (70) is disposed between the auxiliary magnetic poles and includes a sensor body (72,106, 416) and a means (74, 302, 421, 502, 604, 70 2) coupled to the ferromagnetic member for urging the sensor body against an opposing surface of the magnetically permeable object to be inspected.
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