FIELD: study of mechanical vibrations of small amplitudes by contactless method by aids of Doppler laser vibrometry. SUBSTANCE: method measuring periodic law of motion of vibrating surfaces includes formation of array of crossing points of zero level by electric signals in each vibration period, then step-by-step calculation of values of law of motion of vibrating surface Z(t) in this points within limits of each interval between adjacent crossings of zero level is conducted. Results of calculations are joined up on boundaries of intervals with allowance for continuity. EFFECT: improved authenticity of method.
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