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Measurement of Six-Degree-of-Freedom Absolute Postures Using a Phase-Encoded Pattern Target and a Monocular Vision System

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Abstract

A vision based method for six-degree-of-freedom (6-DOF) absolute posture measurement is proposed for evaluation of multi-axis stages or robots. It obtains 6-DOF information from an acquired image of a target pattern plate fixed at a moving object. By introducing a phase-encoded absolute position pattern (PEAPP), the proposed method can overcome the limitation of conventional target patterns carrying additional fiducial marks, and measure wider range of 6-DOF posture with higher precision. A robust data-processing algorithm was devised to decode absolute position codes from the PEAPP images, and to calculate 6-DOF posture efficiently. Performance of a prototype measurement system was evaluated at various aspects including readout stability, nonlinearity, and crosstalk. The measurement results of 6-DOF postures agreed with the reference values within ± 15 μm and ± 0.05° for linear and angular positions, respectively. The limitation of the proposed method and the effect of camera matrix calibration on the performance were also discussed.

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Acknowledgements

This work was supported by the KRISS under the project “Length and Dimensional Standards Team,” Grant GP2023-0002-12.

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Authors and Affiliations

  1. Length Group, Division of Physical Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-Ro, Yuseong-gu, 34113, Republic of Korea

    Jong-Ahn Kim, Jae Yong Lee, Chu-Shik Kang & Sung Hoon Eom

  2. Department of Science of Measurement, Korea University of Science and Technology, 217 Gajeong-Ro, Yuseong-gu, 34113, Republic of Korea

    Chu-Shik Kang

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  1. Jong-Ahn Kim
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Kim, JA., Lee, J.Y., Kang, CS. et al. Measurement of Six-Degree-of-Freedom Absolute Postures Using a Phase-Encoded Pattern Target and a Monocular Vision System. Int. J. Precis. Eng. Manuf. 24, 1191–1203 (2023). https://doi.org/10.1007/s12541-023-00814-7

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  • DOI: https://doi.org/10.1007/s12541-023-00814-7

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