Diffractive laser optical encoder with high tolerance to high-speed mechanical runout

Chyan Chyi Wu, Chih Kung Lee, Shui Shong Lu, Wen Jong Chen, Ching Sang Yang, Chi Tang Hsieh

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This paper is concerned with the design of a laser linear encoder with high head-to-scale alignment tolerance. It adopts 1-x telescope design that can increase by 6 to 20 times the head-to-scale tolerance of existing encoders of the same class. The optical design of the laser encoder can avoid effects from differences in polarization diffraction efficiencies. In other designs the non-uniformity of the temperature field within the head-to-scale range yields a nonzero initial phase and thus decreases the measurement accuracy of the system. The misalignment of the polarizers for the circular polarization interferometer configuration makes for both inclined and elliptical quadrature signals in the output. For an encoder system which adopts an arctangent algorithm, this effect may lower the measuring resolution. The resolution of our laser encoder design is verified by experiments.

Original languageEnglish
Pages (from-to)419-429
Number of pages11
JournalJournal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an
Issue number4
Publication statusPublished - 2001 Jan 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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