TY - JOUR
T1 - High-Precision Digital Rotary Encoder Based on Dot-Matrix Gratings
AU - Chen, Yi Cheng
AU - Lee, Chi Hung
AU - Chou, Ming Jie
AU - Shen, Sheng Chih
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/4
Y1 - 2018/4
N2 - In this paper, a high-precision digital rotary encoder based on dot-matrix gratings (DMGs) is proposed for detecting shaft rotation. The DMG-based encoder is composed of a laser diode, a beam-shaping lens, a code disc, and a detector. In principle, a shaped rectangular beam illuminates a stripe of DMGs on the disc, and from the distribution of diffractive spots on the detector, the position of rotation is then decoded. Compared with a conventional geometric rotary encoder, this diffractive rotary encoder can achieve a fourfold resolution improvement.
AB - In this paper, a high-precision digital rotary encoder based on dot-matrix gratings (DMGs) is proposed for detecting shaft rotation. The DMG-based encoder is composed of a laser diode, a beam-shaping lens, a code disc, and a detector. In principle, a shaped rectangular beam illuminates a stripe of DMGs on the disc, and from the distribution of diffractive spots on the detector, the position of rotation is then decoded. Compared with a conventional geometric rotary encoder, this diffractive rotary encoder can achieve a fourfold resolution improvement.
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U2 - 10.1109/JPHOT.2017.2781465
DO - 10.1109/JPHOT.2017.2781465
M3 - Article
AN - SCOPUS:85038364965
VL - 10
JO - IEEE Photonics Journal
JF - IEEE Photonics Journal
SN - 1943-0655
IS - 2
M1 - 6801712
ER -