High-Precision Digital Rotary Encoder Based on Dot-Matrix Gratings

Yi Cheng Chen, Chi Hung Lee, Ming Jie Chou, Sheng Chih Shen

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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.

Original languageEnglish
Article number6801712
JournalIEEE Photonics Journal
Issue number2
Publication statusPublished - 2018 Apr

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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