Two-dimensional reflective optical encoder based on point source illuminated grating imaging
Abstract
A novel two-dimensional reflective grating encoder is introduced. The optical encoder is developed by a binary amplitude reflective scale grating and a two-dimensional slit displacement sensor, which is fabricated by MEMS technology. Based on Talbot effort, the proposed method can achieve millimetric measurement with high accuracy, where the displacement difference within 0.1% and 0.2% for 1 mm and 20 mm measurement, respectively. By using the eight-segment data division program, the proposed method can easily distinguish 1 μm displacement measurement. Furthermore, in measurement speed tests, the proposed method can reach the movement speed about 5000 μm/s. The experimental results showed the proposed method can achieve high resolution, high speed and long-range measurement, which is potential in the industries and workshops application.
- Publication:
-
Tenth International Symposium on Precision Engineering Measurements and Instrumentation
- Pub Date:
- March 2019
- DOI:
- 10.1117/12.2511441
- Bibcode:
- 2019SPIE11053E..13C