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• W4292489278 endingPage "109668" @default.
• W4292489278 startingPage "109668" @default.
• W4292489278 abstract "• Application of impact echo for imaging of shallow delamination in concrete slab. • Empirical mode decomposition (EMD) and its noise-assisted techniques applied and compared the effectiveness to separate flaw information. • Proposed a technique for reconstruction of spectral image using IMFs that contains flaw information. • Quantified and compared the flaws in spectral B-scan images between the raw and the processed data in terms of its relative amplitude and lateral dimension. • A binary mapping scheme have been employed to estimate the planar area of the flexural mode of vibration in the spectral C-scan images. An impact echo (IE) signal comprises different frequency components as a result of interaction between stress waves and targets. Empirical mode decomposition (and its improved techniques), an adaptive and fully data-driven technique have been used to separate different components of an IE signal into what is known as intrinsic mode functions (IMF). The applications of improved versions of EMD and their advantages over other new adaptive decomposition techniques have also been demonstrated. This separation of modes differentiates constituent signals such as surface wave, echo wave, and flexural wave into corresponding IMFs and thus allows reconstruction of a new signal using only desirable components. An image reconstruction strategy for the selection of appropriate IMFs based on correlation coefficient is found to produce an improved image of the delamination or flaws compared to the raw signal images. The IE signal processed with noise-assisted EMD based techniques profoundly increased the accuracy of flaw features over the raw data. This improvement is validated with a quantification approach using amplitude histogram and binary mapping of flaws in B-scan and C-scan respectively. The study demonstrated that the flexural mode of vibration produced due to shallow delamination can be used for accurate imaging of flaws provided a suitable signal processing technique is used. The technique employed in this study can also be extended for imaging of deep delamination which is exhibited by echo waves in IE signals." @default.
• W4292489278 created "2022-08-21" @default.
• W4292489278 creator A5007161332 @default.
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• W4292489278 date "2023-02-01" @default.
• W4292489278 modified "2023-09-29" @default.
• W4292489278 title "Empirical mode decomposition based techniques for imaging of shallow delamination in concrete using impact echo" @default.
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• W4292489278 doi "https://doi.org/10.1016/j.ymssp.2022.109668" @default.
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