Long description of figure 2

Two-part figure showing the ultrasonic spectroscopy response before and after the delamination enters the ultrasonic path of the transducers. Left: Spectrum shown with a decrease in amplitude after the delamination enters the path. Right: Spectrum resonance spacing shown with only the full-thickness resonance appearing before the delamination enters the path. When the delamination enters the ultrasonic path of the transducers, a resonance corresponding to the location of the delamination appears. In addition, the amplitude of the full thickness resonance reduces by half.

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