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Optical Engineering

Linear and rotary encoders using eletronic speckle correlation
Author(s): Ichirou Yamaguchi; Tadashige Fujita
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Paper 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.

Paper Details

Date Published: 1 December 1991
PDF: 7 pages
Opt. Eng. 30(12) doi: 10.1117/12.56023
Published in: Optical Engineering Volume 30, Issue 12
Show Author Affiliations
Ichirou Yamaguchi, Institute of Physical and Chemical Research (Japan)
Tadashige Fujita, Gakushuin Univ. (Japan)


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