Publication: Publication Date: 1 February 2013Testing Method:
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.
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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.
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