Theconfigiiralion In the frequency space ol" the dilVereni pans of ;i icMilc yarn is examined. The advantages of working with this configuralion in comparison wilh observations in real space are the clear separation of Ihe opaque and the diffuse parts of the yarn from the hairs and the possibility that ti presents to measure hairiness in real lime. Twist, which is usually left out of the analysis of hairiness, is found to be of importance when the opaque and (he diffuse parts of the yarn are filtered oul. The method described is suitable for a spatial spectral analysis of the hairiness of a yarn,
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