METHOD OF MEASURING AMPLITUDE OF VIBRATION Russian patent published in 2007 - IPC G01H9/00 

FIELD: measuring technique.

SUBSTANCE: method comprises illuminating the vibrating body with light beam generated by means of two pulse radiation sources of different wavelength so that the vibrating body overlaps a part of the light beam. The moment of pulse generation of the first source is synchronized with the maximum deviation of the edge of the vibrating body in one direction. The moment of pulse generation of the second generator is synchronized with the moment of maximum deviation of the vibrating body to the opposite direction. The light beam passes through the diaphragm. The remaining part of the light beam is split into two equal beams. Each of the beams is incident on an individual converter of illumination intensity to voltage. The amplitude of vibration is judged by the difference between the voltages recorded.

EFFECT: enhanced accuracy of measurements.

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