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Optical Engineering

Optimizing design of high-resolution optical encoder using a point-source light-emitting diode with slits
Author(s): Yuji Matsuzoe; Kazuhiro Koizumi; Tetsuya Saitoh; Toru Yoshizawa
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Paper Abstract

We discuss an interference fringe type encoder using a point source LED equipped with a slit; this encoder offers high resolution, a wide temperature range, and high reliability. To optimize the design of this encoder, we develop a simulator for an interference-fringe-type encoder using the Fresnel-Kirchhoff diffraction formula, and we analyze the following elements of the optical system of the encoder: (1) the effect of the LED wavelength band, (2) the effect of the size of the LED radiation area, and (3) the effect of the shape of the diffraction grating surface. The interference fringes of this encoder are generated with 60% greater efficiency than an encoder using an LD featuring a very narrow slit width.

Paper Details

Date Published: 1 January 2005
PDF: 7 pages
Opt. Eng. 44(1) 013609 doi: 10.1117/1.1829093
Published in: Optical Engineering Volume 44, Issue 1
Show Author Affiliations
Yuji Matsuzoe, Fuji Electric Advanced Technology Co., Inc. (Japan)
Kazuhiro Koizumi, Fuji Electric Corporate Advanced Technology Co., (Japan)
Tetsuya Saitoh, Fuji Electric Corp. Research and Development, Ltd. (Japan)
Toru Yoshizawa, Tokyo Univ. of Agriculture and Technology (Japan)

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