The laser doppler displacement meter referred to herein as lddm is an instrument system which measures displacement to an accuracy of one part in one million 1 ppm. The lddm laser system measures and enhances computer numerical control cnc and coordinate measuring machine cmm. 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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