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Optimisation of the flux distribution in magnetic flux leakage testing

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In the magnetic flux leakage (MFL) non-destructive testing technique there are many factors that cause degeneration of the measured signal. One of these factors is non-uniformity of the magnetic flux inside the sample under test. Uniformity of the magnetic flux results in smoother and more predictable signals from various flaw types and also a reduction in the eddy current distortions induced because of the movement of the magnetising yoke. The goal of this research is to find a near-optimal length for the magnetising yoke. To this end yokes with different lengths are simulated with the finite element method (FEM) and the quality of the distribution of the flux lines inside the sample is studied. In this way, a criterion for optimisation of the length of the yoke is presented. Lest the optimisation process deteriorates the flaw detection performance, simulating various flaws, the sensitivity of the system was studied for three different yoke lengths: optimal length, shorter and longer lengths.
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Keywords: Magnetic flux leakage; magnetising yoke; non-destructive testing; optimisation

Document Type: Research Article

Affiliations: Electronics Research Center of Sharif University of Technology, PO Box 11155-8639, Tehran, Iran.

Publication date: October 1, 2009

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