Length measurement system with at least one magnetic measuring rod

US6545463B1 · kind B1 · utility

Assignee

• BROSE FAHRZEUGTEILE GMBH & CO. KG, COBURG · DE

Inventors

• Fritz Dettmann · Solms, DE
• Uwe Loreit · Wetzlar, DE
• Heike Bischoff · Cologne, DE
• Hilmar Dohles · Itzgrund, DE

Key dates

• Filing date: Sep 10, 2001
• Grant date: Apr 8, 2003
• Expiry date: Sep 10, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/2492
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In at least one measuring rod of the length measurement system the direction of magnetization lies in the plane of its cross-section which is perpendicular to the direction of measurement and forms a magnetization pattern. In the simplest case the magnetization of the cross-section is homogeneous. As one advances in the direction of measurement the magnetization pattern is increasingly rotated in relation to the starting end of the measuring rod. This magnetization results in a magnetic field whose direction is also continuously rotated as one advances in the direction of measurement. By means of at least one magnetic field sensor which responds to the direction of the magnetic field the prevailing field angle for each position is determined and can be clearly assigned to the position for a multitude of different variants of the length measurement system.