Method of measuring the velocity and/or length of endless webs of textile material and apparatus for carrying out the method

US5064280A · kind A · utility

Assignee

• Deutsches Texilforschungs-zentrum Nord West e.v. · US

Inventors

• Werner Ringens · Krefeld, DE
• Franz J. Schmitz · Zell am Harmersbach, DE
• Eckhard Schollmeyer · Kempen, DE

Key dates

• Filing date: Jan 16, 1989
• Grant date: Nov 12, 1991
• Expiry date: Jan 16, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S17/58
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and an apparatus for measuring the velocity and/or length of endless webs of textile goods are described. The textile web is irradiated with a light beam of which one deflects a first portion prior to impinging on the surface of the textile web and one directs the deflected light beam to evaluation means. The light beams reflected from the surface of the textile web are directed through a convex lens and are also directed to the evaluation means so that the corresponding light beams are superimposed. The velocity and/or the length of the web of textile goods are determined from the frequency of the interference formed by the superposition of the light beams.