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<p>In current calibration methods, when utilizing length, circular, or spherical calibrators with the articulated arm coordinate measuring machine(AACMM), in order to make the most of the measurement space of the AACMM as much as possible, either the calibrator should be made larger or adjusting their poses within the AACMM measuring area. This process is both time-consuming and labor-intensive. Moreover, achieving accurate measurements with these calibrators necessitates employing instruments of higher precision to determine their nominal values. This paper proposes an alternative approach: leveraging existing equipment with precise positioning capabilities on-site to establish calibration points. By utilizing these points, virtual circular and spherical calibrators can be constructed and maintaining the functionality of physical calibrators. The paper extensively details the construction principles and selection methods of virtual calibrators, establishes corresponding objective functions for different shapes of virtual calibrators, and employs a differential evolution algorithm to identify structural parameters. Finally, under controlled laboratory conditions, verification experiments for single-point and length measurements were conducted in accordance with international standard protocols. The experimental findings validate the feasibility and efficacy of the proposed method, offering a broader perspective for calibrator selection and design.</p>

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Calibration method of articulated arm coordinate measuring machine based on virtual calibrators

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Meng Song,
  • Wen Wang,
  • Keqing Lu,
  • Guang Shi,
  • Chuanyong Wang,
  • Zhanfeng Chen

摘要

In current calibration methods, when utilizing length, circular, or spherical calibrators with the articulated arm coordinate measuring machine(AACMM), in order to make the most of the measurement space of the AACMM as much as possible, either the calibrator should be made larger or adjusting their poses within the AACMM measuring area. This process is both time-consuming and labor-intensive. Moreover, achieving accurate measurements with these calibrators necessitates employing instruments of higher precision to determine their nominal values. This paper proposes an alternative approach: leveraging existing equipment with precise positioning capabilities on-site to establish calibration points. By utilizing these points, virtual circular and spherical calibrators can be constructed and maintaining the functionality of physical calibrators. The paper extensively details the construction principles and selection methods of virtual calibrators, establishes corresponding objective functions for different shapes of virtual calibrators, and employs a differential evolution algorithm to identify structural parameters. Finally, under controlled laboratory conditions, verification experiments for single-point and length measurements were conducted in accordance with international standard protocols. The experimental findings validate the feasibility and efficacy of the proposed method, offering a broader perspective for calibrator selection and design.