FIELD: investigating or analyzing materials.
SUBSTANCE: method includes setting the structure to be investigated into interferometer, forming carrying and objecting optical waves using holographic interferometry in real time, obtaining the hologram of the unmovable structure, developing the hologram in situ or returning the structure to the initial position, illuminating the structure and hologram, exciting oscillation of the structure, gradual changing of the frequency of the external excitation, and searching and recording the frequency of resonance oscillations of the structure. .
EFFECT: enhanced accuracy of measuring.
2 dwg
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