A DETECTOR OF FOREIGN FIBRES AND FOREIGN MATERIALS BASED ON AN ABSORPTION MEASUREMENT OF LIGHT AND CORRESPONDING DETECTION METHOD

摘要

The present invention relates to a detector (1) of foreign fibres and to acorresponding detection method, which can be used for detecting foreign fibresand foreign materials in a measurement object (5) in the textile industry, forexample in yarns, slithers and unformed fibre bands on, for example, weavingmachines, spinning machines, bobbin winding machines, doubling machines,cards, drawing benches and bobbin frames ... The principle of the detection isbased on the fact that a measurement object (5) and foreign fibres ormaterials which are situated in the measurement object (5) absorb the lightemitted into the measurement volume (4) by a light source (2) to differentextents. All the light in the measurement volume (4), or a representativesample thereof, is measured by photodetectors (3) and converted into aphotoelectric signal. Comparison of this signal with a signal measured whenthe measurement volume (4) was empty provides the absorption of themeasurement object (5), from which the level of contamination of themeasurement object (5) can be derived by interpretation.