METHOD TO DETECT QUALITY OF MIXING OF LOOSE MATERIALS Russian patent published in 2013 - IPC G01N21/85 

FIELD: measurement equipment.

SUBSTANCE: method consists in preliminary production of "reference" mixture and its digital image. Quality of the actual mixture is determined by separation of its digital image into identical number of parts (cells) and their comparison according to brightness histograms with the image of the "reference" mixture. The coefficient of mixture heterogeneity is calculated according to the formula $$V_m=\frac{100}{S_{av}}\sqrt{{\displaystyle \sum _1^k{\left(S_i-S_{av}\right)}^2}/(k-1)},$$ where k - number of parts (cells); S_i - difference of the i histogram of the part (cell) of the actual image from the "reference" histogram with the criterion of quasidistance of crossings of Swain Ballard histograms; S_av - simple average value of differences.

EFFECT: reduced labour intensiveness, higher speed and accuracy of detection of quality of loose materials mixing.

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