Patent ID: 6470753
Filing Date: 2002-10-29
Classification: G01H

Abstract:
A vibration measuring apparatus, comprising a laser resonator for oscillating a laser beam and generating beat waves through self-mixture of a returning beam obtained when the emitted beam is reflected by the measured object with a oscillated beam when the returning beam is received, a modulated beat frequency generation controller for providing the beat waves with a modulated beat frequency that is higher than a Doppler frequency that is superposed on said returning beam while varying depending on a speed of said measured object, and a signal processor for executing signal processing on the beat waves generated by the self-mixture in said laser resonator and outputting a result of the processing as vibration information, wherein said signal processor comprises a vibration information generator for generating vibration information from the beat waves by defining variations in a frequency of said beat waves as variations in frequency from said modulated beat frequency by the amount of said Doppler frequency.