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Fig. 2. Setup for vertical excitation. The entire setup is placed on a
high-performance laminar-flow isolation table (1). The scanning laser Doppler
vibrometer (SLDV) (2) is suspended and positioned in three dimensions by a
telescopic lifting column (3) and a XY-translation stage (4). A solid
extension arm (5), only used during vertical excitation, allowed positioning
of the first-surface mirror (6), tilted at an angle of 45° in order to
deflect the laser beam downwards by 90°. At the distal end of the
extension arm, an accelerometer (7) monitored the motion of the arm during the
experiment. The specimen was tightly mounted to a metal block (8), which was
driven by the vibration exciter (9). In order to avoid transmission of
vibrations to the SLDV via the supporting table, a rubber mat (10) on
top of an open-cell foam mat (11) separated the table from the vibration
exciter.
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