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Magnetoresistive (MR) sensors in conjunction with low-frequency eddy current can be used for detecting subsurface defects under fasteners in aluminum multilayer airframe structures. Frequently, the fasteners are made of magnetically permeable material, e.g. steel, which can be magnetized resulting in a strong remanence. Strong residual magnetism can shift the work point of MR sensor outside of its...
Principal components analysis (PCA) involves transforming a set of correlated observations into a set of linearly uncorrelated variables, which can reveal simplified trends in data. Multifrequency eddy current testing contains correlations across different test frequencies. In this paper, PCA is used to extract unique information from multifrequency eddy current data sets, used to measure the pressure...
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