The lds measures displacement by monitoring the phase shift of a laser beam reflected from a target. Is the exclusive north american distributor of optomet laser doppler vibrometers and your source for non contact vibration measurement expertise. 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.
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