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Proceedings Paper

Smart optical angle sensor using pseudorandom code and triangle code
Author(s): Hui-Sung Kim; Kyu B. Doh
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Paper Abstract

Absolute optical angle sensor is described that is an essentially digital opto-electronic device. Its purpose is to resolve the relative and absolute angle position of coded disk using Pseudo-random-code and Triangle-code. In this technique, the angular position of disk is determined in "coarse" sense first by pseudo-random code. A further "fine" angular position data based on pixel count is obtained by Triangle-code which result 0.006° resolution of the system provided that 7 μm line image sensor are used. The proposed technique is novel in a number of aspects, such that it has the non-contact reflective nature, high resolution of the system, relatively simple code pattern, and inherent digital nature of the sensor. And what is more the system can be easily modified to torque sensor by applying two coded disks in a manner that observe the difference in absolute angular displacement. The digital opto-electronic nature of the proposed sensor, along with its reporting of both torque and angle, makes the system ideal for use in intelligent vehicle systems. In this communication, we propose a technique that utilizes pseudo-random-code and triangle-code to determine accurate angular position of coded disk. We present the experimental results to demonstrate the validity of the idea.

Paper Details

Date Published: 27 November 2002
PDF: 8 pages
Proc. SPIE 4789, Algorithms and Systems for Optical Information Processing VI, (27 November 2002); doi: 10.1117/12.456520
Show Author Affiliations
Hui-Sung Kim, Hankuk Hangkong Univ. (South Korea)
Kyu B. Doh, Hankuk Hangkong Univ. (South Korea)

Published in SPIE Proceedings Vol. 4789:
Algorithms and Systems for Optical Information Processing VI
Bahram Javidi; Demetri Psaltis, Editor(s)

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