Method for evaluating a signal in an optoelectronic position measuring device

US6653620B2 · kind B2 · utility

Assignee

• Leopold KOSTAL GmbH & Co. KG · DE

Inventors

• Frank Blasing · Werl, DE
• Christian Schirp · Bochum, DE

Key dates

• Filing date: Sep 11, 2002
• Grant date: Nov 25, 2003
• Expiry date: Sep 11, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B62D15/02
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for evaluating a signal generated by a position measuring system having an encoder with a code track. The encoder is interposed between a light source and a light sensor and moves relative to the light source and the sensor such that the code track transmits light from the light source onto the sensor. The light sensor generates the signal as a function of the light received by transducers of the sensor. The method includes determining brightness of a code track signal generated by sensor transducers assigned to a code track of the encoder and determining brightness of a non-code track signal generated by sensor transducers assigned to a non-code track of the encoder. The sensor transducers assigned to the code track of the encoder are then determined as being exposed to the light source as a function of the relative brightness between the code and non-code track signals.