Open AccessVisual encoder: robust and precise measurement method of rotation angle via high-speed RGB vision
Author(s) -
Hyuno Kim,
Yuji Yamakawa,
Taku Senoo,
Masatoshi Ishikawa
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.013375
Subject(s) - encoder , robustness (evolution) , rotary encoder , computer science , optics , rotation (mathematics) , computer vision , artificial intelligence , physics , biochemistry , chemistry , gene , operating system
In this paper, a new measurement method of the rotation angle of a rotor, which is named the 'visual encoder,' was proposed. This method is based on the principles of the vision-based method and the optical encoder, and realized by using a high-speed vision system. The visual encoder shows advantageous features such as non-contact, high-resolution and robustness against the free motion and the fluctuation of the rotation axis. A high resolution method to increase the measurement resolution was also suggested. The accuracy and the robustness of the visual encoder were confirmed through the experimental verifications, and the operation was possible at 6,000 rpm even under the fluctuation of rotation axis.