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Proceedings Paper

High-precision encoder using moire fringe and neural network
Author(s): Kyuwon Jeong; Jongsung Park; Ji Sup Yoon
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Paper Abstract

12 Shaft encoder is widely used in order to measure rotation angle in automatic system. Commonly used incremental encoder is low cost and has high resolution compared with an absolute encoder. However, it is susceptible to power line noise and failures. Absolute type encoders are generally used in applications where it is difficult to return to their home positions in system failure. Both type encoders use light sources, coding disk, light detectors and signal processing circuits. In order to obtain absolute rotary position, gray code is usually utilized in the code disk. Therefore, the resolution of an absolute encoder is dependent on the space to engrave the code. In this paper moire fringe is used to increase the resolution in addition to the gray code pattern. Since the fringes move nonlinearly as the code disk rotates, the position related with the rotation angle is obtained by a neural network. A prototype encoder is set up and a series of experiments are conducted.

Paper Details

Date Published: 12 February 2001
PDF: 8 pages
Proc. SPIE 4190, Optomechatronic Systems, (12 February 2001); doi: 10.1117/12.417214
Show Author Affiliations
Kyuwon Jeong, Chungbuk National Univ. (South Korea)
Jongsung Park, Chungbuk National Univ. (South Korea)
Ji Sup Yoon, Korea Atomic Energy Research Institute (South Korea)

Published in SPIE Proceedings Vol. 4190:
Optomechatronic Systems
Hyungsuck Cho; George K. Knopf, Editor(s)

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