Abstract
Magnetic flux leakage (MFL) testing technique is a commonly used method for the defect analyze and imaging. Due to the restriction of MFL measurement system, in many cases, only one component MFL signal can be measured to analyze the defect, which discounts the defect estimation effect. This paper innovatively puts forward a three-dimensional (3-D) pseudo magnetic flux leakage (PMFL) signal processing technique to solve this problem. The 3-D PMFL signal is only derived from the normal component signal, but can similarly reflect the changing pattern of the whole 3-D MFL signal. Combined with the proposed defect estimation method based on the 3-D PMFL, the defect opening profile can be estimated efficiently. Comparison tests demonstrate the feasibility of the proposed method, and the accuracy of the estimation result based on the 3-D PMFL is superior to that based on only 1-D MFL.
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