A method and arrangement for generating an enlarged measuring volume for the determination of the structure and / or winding speed, textile fibers on the basis of the laser doppler anemometry - -

摘要

A method for contactless determination of the structure and / or the speed of a continuous thread (8) on a winding station (6) of a textile machine by means of a sensor device, wherein of a light source (1, 2) a laser beam (3) and the latter is produced by means of an optical part - and - means (4) for dividing and steering of the laser beam (3) in at least two partial beams (5a, 5b) is divided, which is subsequently be conducted such that it at the thread (8) meet again, whereby the from the thread (8) reflected light according to the laser doppler anemometry - - - a method of measuring signals are produced, for the determination of the structure and / or the speed of the advancing yarn (8) are evaluated electronically, wherein the of the light source (1, 2) generated laser beam (3) by means of the part - and - means (4) is divided in such a way that the two partial beams (5a, 5b) already when it emerges from the part - and - means (4) in such an angle (β) are directed toward one another that they are at the thread (8) cross each other, characterized in that the two partial beams (5a, 5b) according to the outlet from the part - and - means (4) focusing freely on the thread (8) are deflected, and in that the laser doppler anemometry - - - a method as a reference beam method is carried out, wherein one of the two partial beams (5a, 5b) the reference beam and the other forms of the measuring beam.