The Laser Doppler Vibrometer uses the doppler effect to measure the velocity of a vibrating object. It emits a laser beam onto the object, which is then reflected back to the sensor. By analyzing the frequency shift of the reflected light, the vibrometer can accurately determine the velocity and amplitude of the object's vibration.
Laser Vibrometer are used to analyze the vibration c... https://ommatidia-lidar.com/laser-radar-beyond-doppler-vibrometry-fmcw-lidar-1690