PROBLEM TO BE SOLVED: To provide a laser doppler vibration meter capable of precisely measuring the vibration and displacement of a body of revolution.;SOLUTION: The difference D of the displacement P obtained by integrating the velocity signal a1+a2 and the displacement P at one revolution cycle before time is obtained as an apparent displacement b2 generated during one revolution cycle by the velocity component a2 generated by the positional deviation between the optical axis of the laser beam and the revolving axis of the body of revolution or dispersion light. The estimation value E of the apparent displacement b2 generated at each time point by the positional displacement between the optical axis of the laser beam and revolving axis of the body of the rotation and the dispersion light is calculated from the difference D, and the value subtracted with the estimation value E from the displacement P is calculated as a value R representing the true displacement b1 of the object 100 to be measured which gives the velocity component a1 to the speed signal.;COPYRIGHT: (C)2005,JPO&NCIPI
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