Method for evaluating the signals of an optoelectronic displacement or angle measuring device and implementation of said method

US6664536B2 · kind B2 · utility

Assignee

• Leopold KOSTAL GmbH & Co. KG · DE

Inventors

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

Key dates

• Filing date: Sep 13, 2002
• Grant date: Dec 16, 2003
• Expiry date: Sep 13, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/3473
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for evaluating a code signal generated by an encoder having code and reference tracks. The encoder is interposed between a light and a light sensor and moves relative to the light and the sensor such that the code and reference tracks transmit light from the light onto the sensor. The sensor generates the code signal as a function of the light transmitted by the code track which is received by sensor transducers. The method includes capturing and evaluating the amplitude of a reference signal generated as a function of the light transmitted by the reference track which is received by sensor transducers. A measurement parameter relevant for evaluating the amplitude of the code signal is then adapted on the basis of the evaluation of the amplitude of the reference signal in order to compensate the evaluation of the code signal to changing measurement conditions.