FIELD: physics.
SUBSTANCE: use to determine vibration amplitude. Summary of invention consists in the fact that surface is irradiated with a coherent radiation source, a reflected signal is received, vibration frequency is measured, in a given set of harmonics of the reflected signal, harmonic amplitudes are measured starting from the first, based on the obtained amplitude values, selecting a pair of harmonics and calculating for it the ratio of amplitudes, using which the amplitude of vibration is calculated, wherein amplitude of harmonics is measured in such a set of harmonics of the reflected signal, in which monotonic amplitude decay is established, determining the order of the k-th harmonic, having the largest amplitude Ak, amplitude Ak+2 is selected of the order k+2 order and calculating the ratio Ak+2/Ak, using which vibration amplitude is calculated.
EFFECT: wider range of measured amplitudes of vibration.
1 cl, 2 dwg
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