A survey on the grating based optical position encoder

Optical position encoders have been invented and investigated for several decades for precision measurement. In this article, a comprehensive survey on the optical position encoders, from two aspects of industrial products and academic instruments, is presented. The technical background of the optical position encoder is introduced, and the popularity is analyzed through comparison towards other high-accuracy systems. The classification is conducted together with the typical application summarization. The resolution and accuracy enhancement strategies, the fabrication and range enhancement methods, the calibration instruments, and the multi-axis designs of the optical position encoders are reviewed. The original work on the relationship between relative orientation and signal distortion has been presented. The potential trends for future researches of the optical position encoders are also suggested.

Automated summary

This article presents a comprehensive survey on optical position encoders, covering industrial products and academic instruments, along with technical background, popularity analysis, classifications, typical applications, resolution and accuracy enhancement strategies, fabrication and range enhancement methods, calibration instruments, and multi-axis designs. The study also highlights the relationship between relative orientation and signal distortion, and suggests potential trends for future research on optical position encoders.