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Publication - Dr Robert Hughes

    Eddy-current crack detection at frequencies approaching electrical resonance

    Citation

    Hughes, RR & Dixon, S, 2014, ‘Eddy-current crack detection at frequencies approaching electrical resonance’. in: 40th Annual Review of Progress in Quantitative Nondestructive Evaluation - Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing. American Institute of Physics (AIP), pp. 1366-1373

    Abstract

    The effect of operating an absolute eddy-current (EC) probe at frequencies around its electrical resonance was investigated. A defect signal enhancement phenomenon was observed and characterised. Experimental tests were performed on notch defects in typical aerospace superalloys. An absolute mode EC probe was operated by sweeping through a range of frequencies, in the MHz range, encompassing the electrical resonance of the system. Resonance decoupling above defects results in a signal-to-noise ratio (SNR) peak, within a band of frequencies approaching resonance, of up to 3.7 times that measured at 1MHz. This near electrical resonance signal enhancement (NERSE) phenomenon poses the possibility for a simple operational approach method for improving the sensitivity of conventional eddy-current testing.

    Full details in the University publications repository