| 摘要 |
To enable vibration conditions of a measured object to be measured with high accuracy independently of a laser oscillating wavelength. A vibration measuring means includes a laser resonator for oscillating a laser beam and generating beat waves through self-mixture of a returning beam obtained when the oscillated emitted beam is reflected by the measured object with a beam oscillated and emitted when the returning beam is received, a modulated beat frequency generation controller 8 for providing the beat waves with a modulated beat frequency that is higher than a Doppler frequency that is superposed on the returning beam while varying depending on a speed of the measured object, and a signal processor 21 for executing signal processing on the beat waves generated by the self-mixture in the laser resonator and outputting a result of the processing as vibration information. The signal processor 21 comprises a vibration information generator 22 for generating vibration information from the beat waves by defining variations in the frequency of the beat waves as variations in frequency from a modulated beat frequency by the amount of a Doppler frequency.
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