GMR-based magnetic flux leakage technique for condition monitoring of steel track rope

Authors: Sharatchandra Singh, W; Rao, B P C; Mukhopadhyay, C K; Jayakumar, T

Source: Insight - Non-Destructive Testing and Condition Monitoring, Volume 53, Number 7, July 2011 , pp. 377-381(5)

Publisher: The British Institute of Non-Destructive Testing

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Abstract:

The magnetic flux leakage (MFL) technique is proposed for condition monitoring of 64 mm-diameter steel track rope used for transporting coal. In this technique, two saddle coils are used for magnetisation of the rope and the tangential component of leakage magnetic flux from flaws is detected using a giant magnetoresistive (GMR) sensor and amplified selectively. The capability of this technique has been evaluated by detecting local flaws (LFs) and loss of metallic cross-sectional area (LMA) type defects introduced on the track rope. The technique is able to detect 2 mm-deep flaws with good signal-to-noise ratio and resolve flaws separated by more than 3.2 mm. Using the amplitude and full width at half maximum of the MFL signals, it is possible to classify axial and circumferential flaws in the track rope.

Keywords: CONDITION MONITORING; GMR SENSOR; MAGNETIC FLUX LEAKAGE; TRACK ROPE

Document Type: Research Article

DOI: http://dx.doi.org/10.1784/insi.2011.53.7.377

Publication date: July 1, 2011

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