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Precise and robust position estimation for optical incremental encoders using a linearization technique
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DOI：10.1016/j.sna.2015.04.026.png)
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In this paper, an amplitude-to-phase converter for optical incremental encoders is presented. The proposed converter is based on a linearization technique that coverts the sinusoidal signals into a nearly perfectly linear output signal, from which displacement can be determined precisely using a simple linear equation. The theoretical error of the converter is within +/- 0.0196 mu m for an optical encoder with a period of 20 mu m. Simulation results indicate that the proposed converter is significantly more robust to the signal imperfections than the commonly used arctangent algorithm. A signal pre-processing circuit is also developed to further reduce the positioning error caused by the signal phase-shift error. The proposed converter was successfully implemented with a Field Programmable Gate Array (FPGA), and applied to an optical encoder. The robustness and effectiveness of the converter have also been confirmed from experimental results. (C) 2015 Elsevier B.V. All rights reserved.
Keyword:
Optical incremental encoders
Converter
Linearization technique
Robustness
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4.9
论文数:
1.5W
被引数:
3.3W
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High-performance speed measurement by suppression of systematic resolver and encoder errors通过抑制系统旋转变压器和编码器误差实现高性能速度测量
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