Method for contactless measurement of fibrous strand material

摘要

A light source (1) generates a parallel beam (3) to throw a shadow of the yarn (4) on a row of sensors (5), each of which is connected separately to a computer (6). The signal from partially covered sensors (12,14) is taken into account in evaluating the yarn diameter by using a value proportional to the degree of coverage. An Independent claim is also included for the apparatus for carrying out the measurement and calculating the diameter taking into account the signals from fully exposed sensors (8), fully covered sensors (11) and partially covered sensors (12,14).