Smart optical angle sensor using pseudorandom code and triangle code

Hui-Sung Kim; Kyu B. Doh

doi:10.1117/12.456520

27 November 2002 Smart optical angle sensor using pseudo-random-code and triangle-code

Hui-Sung Kim, Kyu B. Doh

Proceedings Volume 4789, Algorithms and Systems for Optical Information Processing VI; (2002) https://doi.org/10.1117/12.456520
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

Citation Download Citation

Hui-Sung Kim and Kyu B. Doh "Smart optical angle sensor using pseudo-random-code and triangle-code", Proc. SPIE 4789, Algorithms and Systems for Optical Information Processing VI, (27 November 2002); https://doi.org/10.1117/12.456520

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