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<p>Research was performed on the detection of faults such as shorts, cuts, and nicks in a printed circuit board pattern. The possibility was investigated of detecting a pattern by illuminating a printed circuit board with violet or ultraviolet rays and detecting the pattern using the (yellow or other) fluorescent light emitted by the base material consisting of glass-epoxy or glass-polyimide, etc. It was found that the pattern could be detected clearly by selecting an optical fiber that would separate the emitted fluorescent light from the illumination and using a detector consisting of a high-sensitivity TV camera that produces a silhouette image in which the base material is bright and the pattern is dark. A printed-circuit-board pattern inspector using this approach was developed. Test operation of the inspector in a plant demonstrated that it performs consistently good pattern inspections.</p>
computer vision; fault detection; short-circuits; pattern recognition; violet illumination; PCB automated inspection; fluorescent light; cuts; nicks; printed circuit board pattern; ultraviolet rays; glass-epoxy; glass-polyimide; optical fiber; high-sensitivity TV camera; silhouette image; circuit analysis computing; computer vision; computerised pattern recognition; fault location; fluorescence; inspection; printed circuit testing

T. Iida, K. Karasaki, Y. Hara and H. Doi, "A System for PCB Automated Inspection Using Fluorescent Light," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 10, no. , pp. 69-78, 1988.
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