FIELD: the invention refers to the field of control-measuring technique and may be used for definition of the amplitude of vibration of objects in tens of nanometers on the spectrum of an autodyne signal.
SUBSTANCE: the mode of definition of the amplitudes of vibrations includes irradiation of an object with laser emanation, transformation of radiation reflected from it into an electric signal, decomposition of the signal into a spectral row, measuring of the amplitude of chosen harmonies. At that the reflected signal is transformed into an autodyne signal providing feedback optical liaison by way of direction of the reflected beam into the resonator of a laser diode, in the spectral row two neighboring harmonies are chosen, the amplitude of vibration is defined out of the given mathematical correlation.
EFFECT: expands diapason of the measured amplitudes of vibrations and possibility of carrying out absolute measurements.
3 dwg
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