Compact optical encoder using modulated pitch phase grating: Suppression of harmonic noise and contrast change

A. Ieki, K. Matsui, M. Nashiki, K. Hane

Research output: Contribution to journalConference articlepeer-review

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.

Original languageEnglish
Pages (from-to)132-135
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3740
Publication statusPublished - 1999 Jan 1
Externally publishedYes
EventProceedings of the 1999 Optical Engineering for Sensing and Nanotechnology (ICOSN '99) - Yokohama, Jpn
Duration: 1999 Jun 161999 Jun 18

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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