Linear and rotary encoders using eletronic speckle correlation

Ichirou Yamaguchi; Tadashige Fujita

doi:10.1117/12.56023

1 December 1991 Linear and rotary encoders using eletronic speckle correlation

Ichirou Yamaguchi, Tadashige Fujita

Author Affiliations +

Optical Engineering, Vol. 30, Issue 12, (December 1991). https://doi.org/10.1117/12.56023

Abstract

Speckle patterns can be used as natural surface markings that are printed by the high coherence of laser light. Speckle displacement caused by linear or rotary motion of a surface is detected with a linear image sensor whose output is analyzed by a real-time correlator. By using an image sensor of 15-μm pitch and 1024 elements, resolution of a micrometer and 1/1000 deg have been attained. The main advantages of the encoders are extreme simplicity in optical configurations and wide ranges of measurement.

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Ichirou Yamaguchi and Tadashige Fujita "Linear and rotary encoders using eletronic speckle correlation," Optical Engineering 30(12), (1 December 1991). https://doi.org/10.1117/12.56023

Published: 1 December 1991

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