1. bookVolume 69 (2018): Issue 6 (December 2018)
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07 Jun 2011
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Magnetic field gradient as the most useful signal for detection of flaws using MFL technique

Published Online: 31 Dec 2018
Page range: 422 - 425
Received: 13 Feb 2018
Journal Details
License
Format
Journal
First Published
07 Jun 2011
Publication timeframe
6 times per year
Languages
English
Copyright
© 2020 Sciendo

The magnetic flux leakage (MFL) technique is extensively used for detection of flaws as well as for evaluation of their dimensions in ferromagnetic materials. However, proper analysis of the MFL signal is hindered by the MFL sensor velocity causing distortions of this signal. Traditionally measured components of the MFL signal are particularly sensitive to the scanning velocity. In this paper, an another signal – the gradient of the normal component of magnetic flux density – was proposed as it is less sensitive to the scanning velocity. Results obtained for scans of the steel plate with artificially manufactured flaws confirm this statement.

Keywords

[1] P. C. Porter, “Use of Magnetic Flux Leakage (MFL) for the Inspection of Pipelines and Storage Tanks”, Proc. SPIE 2454, Non-destructive Evaluation of Aging Utilities (1995), pp. 172–184.Search in Google Scholar

[2] Z. Gan and X. Chai, “Numerical Simulation on Magnetic Flux Leakage Testing of the Steel Cable at Different Speed Title”, ICEOE 2011 - International Conference on Electronics and Optoelectronics, Proceedings, 2011, vol. 3, pp. 316–319.Search in Google Scholar

[3] L. Zhang, F. Belblidia, I. Cameron, J. Sienz, M. Boat and N. Pearson, “Influence of Specimen Velocity on the Leakage Signal Magnetic Flux Leakage Type Nondestructive Testing”, J. Nondestruct. Eval. vol 34, no 6, 2015.Search in Google Scholar

[4] G. S. Park and S. H. Park, “Analysis of the Velocity-Induced Eddy Current MFL Type NDT”, IEEE Trans. Magn., vol. 40, no. 2, pp. 663–666, 2004.Search in Google Scholar

[5] L. Lei, C.Wang, F. Ji and Q.Wang, “RBF-Based Compensation of Velocity Effects on MFL Signals”, Insight-Non-Destructive Test. Cond. Monit., vol. 51, no. 9, pp. 508–511, 2009.Search in Google Scholar

[6] S. Mandayam, L. Udpa, S. S. Udpa and W. Lord, “Invariance Transformations for Magnetic Flux Leakage Signals”, IEEE Trans. Magn. vol. 32, pp. 1577–1580, 1996.Search in Google Scholar

[7] J. B. Nestleroth and R. J. Davis, “The Effects of Magnetizer Velocity on Magnetic Flux Leakage Signals”, Review of Progress Quantitative Nondestructive Evaluation vol. 12A and 12B, D. O. Thompson and D. E. Chimenti (editors), Boston, MA: Springer US, 1993, pp. 1891–1898.Search in Google Scholar

[8] G. Katragadda, Y. S. Sun, W. Lord, S. S. Udpa and L. Udpa, “lVelocity Effects and their Minimization MFL Inspection of Pipelines – a Numerical Study”, Review of Progress Quantitative Nondestructive Evaluation, vol. 14, D. O. Thompson and D. E. Chimenti (editors), New York: Plenum Press, 1995, pp. 499–505.Search in Google Scholar

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