Measuring and testing continuous elongated textile material

摘要

A device for determining optical characteristics of a thread-like element comprises a non-monochromatic light source (52) and a light frequency sensitive light detector (55) being placed in a manner that the thread-like element is illuminated by light emitted from the light source and that a proportion of light emitted from the thread-like element upon illumination by the light source is directed to the detector. Signal processing means (56) are communicatively coupled to the detector and are programmed in a manner that they can carry out the following steps:
€¢ from a time dependent signal of the detector (55), evaluating a time dependent colour signal indicative of the colour of thread-like element,
€¢ from the time dependent colour signal, evaluating a time dependent colour deviation information indicative of deviations of the colour from the average colour of the thread-like element,
€¢ correlating said time dependent colour deviation information with a time dependent quantitative signal deviation information, and
€¢ determining, based on information whether the time dependent colour deviation information and the time dependent total signal deviation are correlated, fault information indicative of the nature of faults of the thread-like element.