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A System for PCB Automated Inspection Using Fluorescent Light
January 1988 (vol. 10 no. 1)
pp. 69-78

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.

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Index Terms:
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
Y. Hara, H. Doi, K. Karasaki, T. Iida, "A System for PCB Automated Inspection Using Fluorescent Light," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 10, no. 1, pp. 69-78, Jan. 1988, doi:10.1109/34.3868
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