METHOD FOR MONITORING THE QUALITY OF YARN OR ANOTHER LINEA R TEXTILE FORMATION IN AN OPTICAL DETECTOR OF THE QUALITY OF YARN AND A LINEAR OPTICAL DETECTOR FOR CARRYING OUT THE METHOD

摘要

The invention relates to a method for monitoring quality of a yarn or another linear textile formation in an optical detector of quality of a yarn by means of a linear optical sensor comprising one or two rows of individual rectangular-shaped optical elements (10), which in their output provide analog signals proportional to the extent of their irradiation. The yarn is irradiated by cyclically alternating low-intensity and high-intensity radiation, whereby within each cycle analog signals of all the individual optical elements (10) are monitored and recorded at least at high intensity of radiation and from these signals for each individual element (10)the value of the analog signal is subtracted at low intensity of radiation, detected either in ad vance or during a respective cycle, , by which means the resulting analog signal is exempt from all the parasitic influences, its size depending only on the degree of radia tion by the source of radiation of the optical detector. The invention also relates to a linear optical detector for carrying out this method.