Fig. 2
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Using lensless digital holography with pulsed illumination, the deformation on aluminum surfaces caused by GUWs is measured at different excitation frequencies being applied to the piezo actuator. The excitation frequencies applied here were fExc = 60 kHz and fExc = 140 kHz for aluminum plates of thickness a), c) d = 5.0 cm and b), d) d = 2.6 cm.
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