Optical method and device for automatically classifying cylindri

Details Optical method and device for automatically classifying cylindri Optical method and device for automatically classifying cylindri

1995-10-12

1997-02-11

Pham, Hoa Q.

Optics: measuring and testing

By inspection with agitation or rotation

356237, 356445, G01N 2184

Patent

active

056026463

ABSTRACT:
In order to classify cylindrical nuclear-fuel pellets automatically, they are rotated about their axis. A flat beam is focused onto a nominal generatrix of the pellet. The returned light coming from an elongate zone, this being the zone illuminated on a defect-free pellet, is collected. The intensity is detected, point by point, along the zone and the defects are deduced from the variations in the intensity. To this end, the points of each zone are determined in which the intensity of the returned light lies between two adjustable normality thresholds, the transition points are stored in memory, and the limits of each defect and its type are determined by neighborhood analysis.

REFERENCES:
patent: 4162126 (1979-07-01), Nakagawa et al.
patent: 4226539 (1980-10-01), Nakagawa et al.
patent: 4410278 (1983-10-01), Makihira et al.
patent: 4532723 (1985-08-01), Kellie et al.
patent: 5186887 (1993-02-01), Yaginuma

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