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1. (WO2009127667) METHOD AND ARRANGEMENT FOR DETERMINING THE VELOCITY OF A RUNNING THREAD

Pub. No.:    WO/2009/127667    International Application No.:    PCT/EP2009/054480
Publication Date: Oct 22, 2009 International Filing Date: Apr 15, 2009
IPC: G01P 3/36
G01S 17/58
Applicants: VIENCO GMBH
PROF. Dr. HERMANNS, Ferdinand Josef
LINDEN, Martin
Inventors: PROF. Dr. HERMANNS, Ferdinand Josef
LINDEN, Martin
Title: METHOD AND ARRANGEMENT FOR DETERMINING THE VELOCITY OF A RUNNING THREAD
Abstract:
The invention relates to a method for contactlessly determining the instantaneous velocity of a running thread by means of at least one optical detector, wherein the detector generates, according to the laser Doppler anemometry method, measurement signals (1, 1a, 1b, 2, 2a, 2b) in the form of frequencies which depend on at least one laser beam that is influenced and/or reflected by the thread and which are electronically evaluated in order to determine the instantaneous velocity of the running thread, wherein those frequencies which are below a cut-off frequency (3, 3a, 3b) are at least temporarily masked during the electronic evaluation, and wherein the cut-off frequency (3, 3a, 3b) depends on an average velocity of the running thread. The invention also relates to an arrangement which is suitable for carrying out this method.