Hybrid Signal Processing Approach for Enhanced Detection of Defects in EC-NDE

In eddy current (EC) testing, presence of lift–off and material property variation makes the defect detection as a challenging task. In view of this, a signal processing approach comprising of independent component analysis (ICA) and wavelet packet analysis (WPA) is attempted. In this paper, performance of hybrid signal processing approach and the resultant improvement in signal-to-ratio (SNR) is discussed.

1. S. Udpa and P. O. Moore. Nondestructive Testing Handbook, Vol. 5 – Electromagnetic Testing. 3rd ed. ASNT Edition, Columbus, OH (2004). 2. H. L. Libby. Introduction to Electromagnetic Nondestructive Test Methods. Wiley Interscience, New York (1971). 3. J. Blitz. Electrical and Magnetic Methods of Non-destructive Testing. 2nd ed. Chapman & Hall, London (1997). 4. K. Arunachalam, P. Ramuhalli, L. Udpa, and S. Udpa. Review of Progress in Quantitative Nondestructive Evaluation 21A:631–638 (2002). TABLE 2 SNR Obtained by Exploited Processing Approach Defect-ROI SNRInputImage,(dB) SNRWPA SNRICA SNRWPA-ICA SNRICA-WPA 1 3.2 10.3 12 13.2 16.4 2 4.0 10.6 12 13.2 16.6 3 8.5 11.3 12.7 13.9 19.5 4 9.2 11.8 13.5 14.1 20.1 60 B. SASI ET AL. 5. G. Chen, A. Yamaguchi, and K. Miya. IEEE Trans. on Magnetics 34(3):642–648 (1998). 6. B. Sasi, B. P. C. Rao, T. Jayakumar, and B. Raj. Research in Nondestructive Evaluation 21(3):157–170 (2010). 7. F. C. Morabito. Materials Evaluation 58(1):85–92 (2000). 8. G. Simone and F. C. Morabito. Proc. of Int. Joint Conf. on Neural Networks V:59–64 (2000). 9. B.-H. Shin, P. Ramuhalli, L. Udpa, and S. Udpa. Rev. of Prog. Quantitative NDE 23A:597–604 (2004). 10. M. Cacciola, A. Gasparics, F. C. Morabito, M. Versaci, and V. Barrile. PIERS Online 3(4):517–521 (2007). 11. I. Daubechies. Ten Lectures on Wavelets. CBMS-NSF Series in Applied Mathematics. Society for Industrial and Applied Mathematics, Philadelphia, Pennsylvania (1992). 12. C. K. Chen. Introduction to Wavelets. Academic Press, Boston (1991). 13. J. Yu and S. Karlsson. Circuits System Signal Processing 20(5):497–528 (2001). 14. J. Gubbi Jr., A. Khandoker, and M. Palaniswami. Computers in Cardiology 36:733–736 (2009). 15. F. H. Ahmad, R. M. Castellane, and B. P. Durst. Spectroscopy Letters, an International Journal for Rapid Communication 35(4):527–541 (2002). 16. A. Hyvarinen and E. Oja. Neural Networks 13(4–5):411–430 (2000). 17. A. Hyvarinen, J. Karhunen, and E. Oja. Independent Component Analysis. Wiley, New York (2001). 18. S. Fiori and P. Burrascano. Neurocomputing 56:233–255 (2004). 19. A. Leon-Garcia. Probability and Random Processed for Electrical Engineering. 2nd ed. Addison Wesley, New York (1994). 20. A. Hyvarinen. IEEE Trans. on Neural Networks 10(3):626–634 (1999). 21. A. Hyvarinen and E. Oja. IEEE Trans. on Neural Computation 9(7):1483–1492 (1997
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