Laser doppler displacement meter. Briefly when a laser beam is reflected from a moving target the doppler frequency shift 0 is f v f cj 6 where fl is the laser frequency c is the speed of light and v is the target velocity parallel to the laser beam. The laser beam from the ldv is directed at the surface of interest and the vibration amplitude and frequency are extracted from the doppler shift of the reflected laser beam frequency due to the motion of the surface.
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