METHOD FOR DETECTING SURFACE FLAWS ON CYLINDRICAL PIECES OF EQUIPMENT Russian patent published in 2008 - IPC G21C17/06 

FIELD: nuclear fuel production.

SUBSTANCE: proposed method for detecting surface flaws on cylindrical pieces of equipment includes sequential delivery of piece of equipment under inspection to surface inspection position. Butt-end surfaces of piece of equipment delivered to inspection position are illuminated by radiating flux. Radiation detectors receive radiation reflected from butt-end surfaces. Images received from detectors are treated in analyzing device. Side surface of piece of equipment under inspection is illuminated by radiation flux passed at angle φ to normal to its surface. Image reflected at angle to normal equal to incident angle of radiating flux is received. Butt-end surfaces of piece of equipment under inspection are illuminated by radiating flux passed at angle α to normal to butt-end surface. Radiation reflected from butt-end surfaces at angle to normal equal to incident angle of radiating flux is received. Image boundaries of piece-of-equipment surfaces are determined in image frames by means of analyzing device using boundary tracing method. Same method is used to find surface flaw sections on surface images. Surface flaws are described by geometric figures. Surface areas of these figures are calculated. Type of flaws is determined, and decision is taken on fitness of piece of equipment under inspection basing on logic decision rules.

EFFECT: enhanced reliability of on-line inspection of cylindrical pieces of equipment for surface flaws and their type.

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