vibrometer
A vibrometer is a device for quantifying mechanical vibrations. It measures the oscillation speed of an object. Vibrometers contain a laser that is focused on the surface to be measured. Due to the Doppler effect, the frequency of the backscattered laser light shifts with a movement of the surface to be measured. This frequency shift is evaluated in the vibrometer by means of an interferometer and output as a voltage signal or digital data stream. A scanning vibrometer allows the measurement of vibrations.