Figure 10: Fringe patterns of the sandwich plate obtained while it is excited simultaneously by a shaker and the piezoelectric transducer at 5 and at 50 kHz respectively. (A) Image obtained with only 5 kHz excitation; (B) image obtained with only 50 kHz excitation; (C) image obtained with both excitations active and shearography triggered at their difference 45 kHz; and (D) image obtained with both excitations active and shearography triggered at 5 kHz. The dimensions of the images are 12 cm (H) · 16 cm (W)
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