FIELD: mining. SUBSTANCE: optically sensitive model is made of layers with different elastic properties. Model is transilluminated by polarized coherent light in two mutually perpendicular directions with linear vertical and horizontal polarization of light. Interference pattern is fixed by photoreceivers in integral manner across all sections of model which are first in unloaded and then in loaded state with the help of press. EFFECT: higher efficiency. 1 dwg
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