Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-05-07
1991-05-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356385, G01N 2186
Patent
active
050177958
ABSTRACT:
Apparatus is disclosed for detecting irregularities or flaws in seams such as the seams of cans. The apparatus includes means for irradiating the surface of the seam to produce reflected radiation signals, a plurality of radiation sensors, each having a selected field of view of the surface, and each producing sensor output signals dependent on reflected radiation signals received within such field of view. A signal processing means receives sensor output signals for a succession of fields of view along the longitudinal length of the seam and derives therefrom signal data representing a dimensional feature of the seam. Signl comparison means compares such derived data with signal data representing an acceptable dimensional limit and produces a rejection signal in the event that the dimensional feature does not fall within the limit. Means for classifying the nature of an irregularity is also disclosed, as is transport means for the movement of seams though the field of view of the sensors.
REFERENCES:
patent: 4555633 (1985-11-01), Bjorkelund
patent: 4798963 (1989-01-01), Wittkopp et al.
Wang, "White Light Seam Tracking System for Arc-Welding Robot," SPIE, vol. 850 Optics, Illumination, and Image Sensing for Machine Vision II (1987), pp. 101-107.
Goebbels, "Automation of Surface Defect Detection and Evaluation," SPIE, vol. 849, Automated Inspection and High Speed Vision Architectures (1987), pp. 117-124.
Optical Sensing for Process Control, Excerpt from Text, Section 7.5.2, "Active Optical Sensors for Robotic Welding Monitoring," pp. 451-457.
Acres Robert W.
Davis Harold R.
Donham Andrew N.
Dower Roger G.
Riahi Nader
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