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Proceedings Paper

Compact optical encoder using modulated-pitch phase grating: suppression of harmonic noise and contrast change
Author(s): Atushi Ieki; K. Matsui; M. Nashiki; Kazuhiro Hane
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Paper Abstract

In this paper, we investigate the combination of two gratings for a compact optical displacement encoder. The modulated pitch gratings are considered to obtain the sinusoidal signal as a function of displacement. In addition, the phase grating with the pitch modulation is examined to suppress the contrast change of the encoder signal as a function of the gap between the index and main scales. By these investigations, we find some combinations of gratings to satisfy the above requirements.

Paper Details

Date Published: 7 May 1999
PDF: 4 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347783
Show Author Affiliations
Atushi Ieki, OKUMA Corp. (Japan)
K. Matsui, OKUMA Corp. (Japan)
M. Nashiki, OKUMA Corp. (Japan)
Kazuhiro Hane, Tohoku Univ. (Japan)


Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)

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