OPTICAL ENCODERS

Optical encoder based on the Lau effect

[+] Author Affiliations
Daniel Crespo, Jose´ Alonso

Departamento de O´ptica, Universidad Complutense de Madrid, Facultad de Ciencias Fi´sicas, Ciudad Universitaria, s/n, Madrid?28040, Spain

Toma´s Morlanes

Departamento de I+D, Fagor Automation S. Coop, Barrio de San Andre´s s/n, P.O. Box 194, Mondrago´n?20500, Guipuzcoa, Spain

Eusebio Bernabeu

Departamento de O´ptica, Universidad Complutense de Madrid, Facultad de Ciencias Fi´sicas, Ciudad Universitaria, s/n, Madrid 28040, Spain

Opt. Eng. 39(3), 817-824 (Mar 01, 2000). doi:10.1117/1.602432
History: Received Mar. 24, 1999; Revised July 20, 1999; Accepted Sep. 7, 1999
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Abstract

An optical encoder based on the Lau effect is presented. It is shown that this system has several advantages over standard optical encoders based on the moire´ effect, such as smaller sensitivity to variations in the gap between gratings and higher design simplicity. Problems due to the quality of the collimated beam, which are present in moire´-effect-based encoders, are also avoided. Two different optimized designs for different resolutions are presented. Experimental measurements, in good agreement with the model developed by us, are presented. © 2000 Society of Photo-Optical Instrumentation Engineers.

© 2000 Society of Photo-Optical Instrumentation Engineers

Citation

Daniel Crespo ; Jose´ Alonso ; Toma´s Morlanes and Eusebio Bernabeu
"Optical encoder based on the Lau effect", Opt. Eng. 39(3), 817-824 (Mar 01, 2000). ; http://dx.doi.org/10.1117/1.602432


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