Development of portable and real-time self-calibration angle encoder

Huang, Yao; Xue, Zi; Lin, Hu; Wang, Yan

doi:10.1117/12.2214410

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…During the rotation process, the relative movement of the grating pair produces a changing moiré fringe, and the moiré signal corresponds to the displacement output by the photoelectric reading head [2]. There are quite a few factors affecting the accuracy of the rotary table [3], which can be roughly divided into inherent error and applicationdependent error [4], of which the eccentricity error in the application-dependent error is the most important factor affecting the accuracy of angle measurement [5][6][7]; therefore, separating the eccentricity error is of great value to ensure the accuracy of the rotary table.…”

Section: Introductionmentioning

confidence: 99%

An Eccentricity Error Separation Method for Rotary Table Based on Phase Feature of Moiré Signal of Single Reading Head

Huang,

Che,

Zhu

et al. 2023

Photonics

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In view of the limitations of the existing eccentricity error separation method of the rotary table, an eccentricity error separation method based on the phase feature of the moiré signal of a single reading head is proposed herein. A grating pair transmission model is established based on the analysis of the principle of the rotary table; thereby, the influence of eccentricity error on the phase feature of the moiré signal in the rotation course of the rotary table is clarified, and the corresponding model between the phase feature spectral components and the eccentricity error is established. The verification experiments of the proposed method are carried out based on the laboratory-made circuit system. After verifying the accuracy of the data acquisition of the laboratory-made circuit board, the verification experiments of the eccentricity error separation effect of the proposed method are carried out. The experimental data are compared with those of the traditional method, and the results show that the error between the two methods is 2.34 μm, while the relative error is 2.3%.

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Section: Introductionmentioning

confidence: 99%

An Eccentricity Error Separation Method for Rotary Table Based on Phase Feature of Moiré Signal of Single Reading Head

Huang,

Che,

Zhu

et al. 2023

Photonics

Self Cite

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“…With the development of high-end manufacturing, rotary optical encoders with higher accuracy are required. In practice, many factors affect the accuracy of rotary optical encoders, such as inherent error, installation eccentricity error, external environment, and so on [6]. Among these factors, the installation eccentricity of the grating scale is the dominant error source [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

On-line angle self-correction strategy based on a cobweb-structured grating scale

Zhao

et al. 2021

Meas. Sci. Technol.

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Installation eccentricity of the grating scale is the main source of error for rotary optical encoders in practical applications. In this paper, an on-line angle self-correction strategy for rotary optical encoders is proposed. Firstly, the eccentricity error model is described, which explains the numerical relationship between the eccentricity error and the eccentric parameters including eccentric distance and eccentric angle. Then, a bioinspired cobweb-structured grating scale is adopted as the measurement standard of the rotary optical encoder. This grating scale allows the rotary optical encoder to sense the rotary angle and the radial displacement simultaneously. The eccentric parameters can be determined in real time from the rotary angle and the radial displacement information. Thus, the measured rotary angle can be on-line corrected by applying the eccentric parameters to the eccentricity error model. The feasibility and effectiveness of the proposed strategy have been confirmed from the experimental results.

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Self-calibratable absolute modular rotary encoder: a theoretical feasibility study

Gurauskis,

Mažeika,

Kilikevičius

2024

Meas. Sci. Technol.

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This paper introduces a self-calibratable absolute modular rotary encoder based on the equal division average method, designed to significantly enhance measurement accuracy and simplify installation. The proposed design integrates multiple optical sensors into the encoder stator Printed circuit board, enabling precise absolute position measurement through the averaging of sensors data. This multi-sensor approach compensates for alignment and installation inaccuracies, which are common issues in conventional modular encoders. To validate the design and predict encoder behaviour prior to manufacturing, a theoretical modelling of virtual optical sensors is performed. Based on experimentally collected cross-calibration data from a real optical encoder, this modelling framework enables to estimate the efficiency of self-calibration algorithm with sufficient accuracy and optimize the design and performance of the encoder. The obtained results confirm that the proposed measurement system significantly reduces error margin, improving the reliability and precision of position feedback. The initial position deviation of several hundreds of arcseconds might be reduced and kept below 8 arcseconds by using two or more additional optical sensors, even with the 0.5 mm misalignment of the encoder stator.

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Development of portable and real-time self-calibration angle encoder

Cited by 4 publications

References 4 publications

An Eccentricity Error Separation Method for Rotary Table Based on Phase Feature of Moiré Signal of Single Reading Head

An Eccentricity Error Separation Method for Rotary Table Based on Phase Feature of Moiré Signal of Single Reading Head

On-line angle self-correction strategy based on a cobweb-structured grating scale

Self-calibratable absolute modular rotary encoder: a theoretical feasibility study

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