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

Atushi Ieki; K. Matsui; M. Nashiki; Kazuhiro Hane

doi:10.1117/12.347783

7 May 1999 Compact optical encoder using modulated-pitch phase grating: suppression of harmonic noise and contrast change

Atushi Ieki, K. Matsui, M. Nashiki, Kazuhiro Hane

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Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347783
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

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.

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Atushi Ieki, K. Matsui, M. Nashiki, and Kazuhiro Hane "Compact optical encoder using modulated-pitch phase grating: suppression of harmonic noise and contrast change", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347783

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KEYWORDS

Diffraction gratings

Modulation

Diffraction

Computer programming

Phase shift keying

Optical encoders

Distortion

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