RNon-contact measurement of natural frequency and vibration damping

The free vibration of an aluminium plate that is clamped at one side is measured with the fast RTSS system. The plate is accelerated by an impulse at the free end. The fast RTSS system achieves a measurement rate of 1500Hz and can therefore resolve motion frequencies up to 500Hz.
The images show the 100mm long free end of the plate and the diagrams with the time course of displacement and its fourier transformation. The measured natural frequency is 99,3 Hz.