A Method for Compensating Interpolation Error of Absolute Linear Encoder

Dong, 乔栋 Qiao; Zhijun, 续志军 Xu; Hongsheng, 吴宏圣 Wu; Qifeng, 曾琪峰 Zeng; Yang, 刘阳 Liu; Qiang, 孙强 Sun

doi:10.3788/aos201535.0112008

Cited by 2 publications

(1 citation statement)

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“…Position noise (b in Figure 1) typically arises from electrical jitter within the electronic system error(yellow curve in Figure 1) commonly results from thermal variations errors, and it is relatively straightforward to calibrate. On the other hand, SD caused by scanning quality issues or imperfect grating lines, making them to compensate for [12]. An SDE recurs in each and every pitch period [13], ative impact on the applications where trajectory control is critical, such a and high precision metal surface processing.…”

Section: Introductionmentioning

confidence: 99%

A Method for Reducing Sub-Divisional Errors in Open-Type Optical Linear Encoders with Angle Shift Pattern Main Scale

Lu,

Yang,

Kilikevičius

2024

Mathematics

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In this research, a novel approach is presented to enhance the precision of open-type optical linear encoders, focusing on reducing subdivisional errors (SDEs). Optical linear encoders are crucial in high-precision machinery. The overall error in optical linear encoders encompasses baseline error, SDE, and position noise. This study concentrates on mitigating SDEs, which are recurrent errors within each pitch period and arise from various contributing factors. A novel method is introduced to improve the quality of sinusoidal signals in open-type optical linear encoders by incorporating specially designed angle shift patterns on the main scale. The proposed method effectively suppresses the third order harmonics, resulting in enhanced accuracy without significant increases in production costs. Experimental results indicate a substantial reduction in SDEs compared to traditional methods, emphasizing the potential for cost-effective, high-precision optical linear encoders. This paper also discusses the correlation between harmonic suppression and SDE reduction, emphasizing the significance of this method in achieving higher resolutions in optical linear encoders.

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Section: Introductionmentioning

confidence: 99%