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首页> 外文期刊>Optics and Lasers in Engineering >A simultaneous calibration technique of the extrinsic and turntable for structured-light-sensor-integrated CNC system
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A simultaneous calibration technique of the extrinsic and turntable for structured-light-sensor-integrated CNC system

机译：用于结构光传感器集成的CNC系统外在和转盘的同时校准技术

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摘要

The center of the mandrel-target is unique and does not get affected by the extrinsic angle of the projector. On this basis, a mandrel-target-based method is described to simultaneously calibrate the extrinsic parameters and the turntable of a multi-axis, structured-light-sensor-integrated, three-dimensional (3-D) scanning system. Besides, a cross-section-arc algorithm is developed to identify the conjugate pair. By computing the mandrel-center in the light plane, some collinear scanning points are generated along with the spindle scanning. Further, these calibration points are employed to the tip-tilt self-calibration of the turntable. In the two-scanning strategy, three sets of non-colinear points are derived simultaneously by relatively moving the sensor at distinct world coordinates. These generated points are fulfilled to calibrate the extrinsic parameters with the relative motion model. By determining the direction vectors, the skewed sensor coordinates are converted into the Cartesian world coordinates. The effectiveness of the proposed method is verified using a set of experiments. The accuracy of the proposed model is justified by comparing it with the measurements of a CMM trigger probe. The absolute measurement accuracy for a mandrel-target (about 7.4827 mm in radius and 16 mm in depth) is 0.002 mm. The target is cost-effective and simple in shape. The calibration procedure is easy to carry out and highly accurate.
机译：心轴 - 目标的中心是独一无二的，不会受到投影仪外部角度的影响。在此基础上，描述了基于心轴 - 目标的方法来同时校准外部参数和多轴结构光传感器集成的三维（3-D）扫描系统的外形参数和转盘。此外，开发了横截面弧算法以识别共轭对。通过计算光平面中的心轴中心，与主轴扫描一起产生一些共线扫描点。此外，这些校准点用于转盘的尖端自校准。在两次扫描策略中，通过在不同的世界坐标处相对移动传感器，同时导出三组非加元点。满足这些产生的点以通过相对运动模型校准外部参数。通过确定方向向量，偏斜的传感器坐标被转换为笛卡尔世界坐标。使用一组实验验证所提出的方法的有效性。通过将其与CMM触发探针的测量比较，所提出的模型的准确性是合理的。心轴靶（半径约7.4827mm的绝对测量精度为0.002mm。目标是成本效益和简单的形状。校准程序易于执行和高度准确。

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  • 来源
    《Optics and Lasers in Engineering》 |2021年第3期|106451.1-106451.11|共11页
  • 作者

    Shi Zhaoyao; Wang Tao; Lin Jiachun;

  • 作者单位

    Beijing Univ Technol Beijing Engn Res Ctr Precis Measurement Technol & 100 Pingleyuan Beijing 100124 Peoples R China;

    Beijing Univ Technol Beijing Engn Res Ctr Precis Measurement Technol & 100 Pingleyuan Beijing 100124 Peoples R China;

    Beijing Univ Technol Beijing Engn Res Ctr Precis Measurement Technol & 100 Pingleyuan Beijing 100124 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Line-structured light; Extrinsic calibration; Tip-tilt calibration; Mandrel-target; Conjugate pair;

    机译：线结构光;外在校准;尖端校准;心轴 - 目标;共轭对;

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