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JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS, vol.6, no.7, pp.721-724, 2004 (SCI-Expanded)
Analysis of optical methods and systems used to detect defects of a yam, e.g. chenille yam which will simply be called yam throughout the paper, indicates that the detection results in current methods and systems depend on the yarn speed. In this paper, we report on an optical diagram with a wide-angled light emitter that has been developed to show the optical method of defect detection. The equation expressing the difference between the real defect length and the shadow length or detected defect length formed on the detection surface is obtained.