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Ultrasonic Imaging of Concrete by Synthetic Aperture Focusing Technique Based on Hilbert Huang Transform of Time Domain Data

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Figure

Fig. 1Concrete block specimen. (a) Pitch-catch method conducted on thetop surface of the specimen, (b) Target area for image reconstruction.
Fig. 4SAFT image of normalized data.
Fig. 7Frequency and amplitude variation as a function of time. (a) Hilbert spectrum for IMF3, (b) Hilbert spectrum for IMF4.

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