METHOD OF DETERMINING THERMAL RESISTANCE OF COALS Russian patent published in 2016 - IPC G01N3/60 

FIELD: metrology.

SUBSTANCE: invention relates to metrology, particularly to means of measuring heat resistance of coals. Method involves applying two successive thermal shocks on coal sample, wherein second shock has higher intensity than the first one, and recording parameters of acoustic emission. Orientation of sample relative to heating source is constant. Recording of parameters of acoustic emission is performed at heating stages, and at the stages of cooling the sample after each of the thermal shocks. Determining the boundaries of time intervals corresponding to regions of peak values of acoustic emission, when its level is not less than one and half times higher than the level of background noise. In each of these intervals average values of acoustic emission activity are calculated. Acoustic emission activity level during the second thermal shock action, which is rendered to sample not containing moisture, indicates the number of damaged structural links, and the same parameter, but during further cooling, indicates the number of the preserved structural links, changing of stressed state to initial state. Then in relation to values of average acoustic emission activity during heating and cooling the coefficient of thermal resistance geomaterial is calculated.

EFFECT: technical result is improvement of reliability and accuracy of measurements.

1 cl, 4 dwg