ACOUSTIC EMISSION METHOD OF CONTROLLING QUALITY OF MATERIALS ON SAMPLES Russian patent published in 2013 - IPC G01N29/14 

FIELD: physics.

SUBSTANCE: mechanical stress is generated by heating a local region of a sample lying equidistant from its top and bottom end surfaces and parallel thereto to 90°C; acoustic emission signals propagating from the heated local region are received at each of said surfaces; curves of total count of said signals versus time are plotted, on which values corresponding to the time when the rise of said curves stops are selected, and the ratio of least value to the greatest value is used to determine presence of crack defects and location thereof relative the heated local region.

EFFECT: high reliability and easier detection of crack defects in samples of rock geomaterials, enabling estimation of the location of said defects relative the centre of the sample.

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