Signal de-noising based on ICEEMDAN for delamination detection by phased array ultrasonic testing

Aiming at the problem of clutter noise of inter-layer reflections that occurs in multilayer heterogeneous medium such as hybrid fibre composites during ultrasonic inspection, a signal de-noising method based on the improved complete ensemble empirical mode decomposition with adaptive noise (ICEEMDAN...

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Bibliographic Details
Published in:Journal of physics. Conference series 2024-09, Vol.2822 (1), p.12184
Main Authors: Zhang, PH, Ma, SW, Huang, KH, Pan, YD
Format: Article
Language:English
Subjects:
Clutter
Correlation coefficients
Cross correlation
delaminated defects
Fiber composites
Hilbert transformation
hybrid fiber composites
Interlayers
Multilayers
Noise
Phased arrays
Root-mean-square errors
signal denoising
Signal reflection
Ultrasonic testing
Ultrasonics detection
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Summary:Aiming at the problem of clutter noise of inter-layer reflections that occurs in multilayer heterogeneous medium such as hybrid fibre composites during ultrasonic inspection, a signal de-noising method based on the improved complete ensemble empirical mode decomposition with adaptive noise (ICEEMDAN) is proposed in this paper. In the method, the cross-correlation coefficient is utilized to identify the intrinsic mode function (IMF) that is related to raw ultrasonic signal. Particularly, the root mean square error (RMSE), as selection criterions, are employed conjunctively to sift the optimal IMF among selected decomposition signals. Hilbert transform is used to extract the envelope of the signal after removing the interlayer reflection noise. Experimental results show that, the proposed method can adaptively decompose the non-stationary ultrasonic signal into several IMFs with different spectrum so as to dealing with clutter noises. For delaminate detection by phased array ultrasonic testing for hybrid fibre composites, structural noises are significantly suppressed in the reconstructed signal that retains the distinct echo characteristics of a delaminated defect.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2822/1/012184