光笔式视觉测量系统中的测头中心自标定

刘书桂; 董英华; 姜珍珠

doi:10.3788/OPE.20132107.1727

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光笔式视觉测量系统中的测头中心自标定

微纳技术与精密机械 | 更新时间：2020-08-12

- 光笔式视觉测量系统中的测头中心自标定
- Self-calibration of probe tip center for 3D vision coordinate measuring system in portable light pen
- 光学精密工程 2013年21卷第7期页码：1727-1733
- 作者机构：
  
  天津大学精密测试技术及仪器国家重点实验室天津,300072
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20132107.1727
  中图分类号： TP242.62;TH72
- 收稿日期：2012-12-24，
  
  修回日期：2013-02-04，
  
  网络出版日期：2013-07-15，
  
  纸质出版日期：2013-07-15
- 稿件说明：
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刘书桂董英华姜珍珠. 光笔式视觉测量系统中的测头中心自标定[J]. 光学精密工程, 2013,21(7): 1727-1733

. Self-calibration of probe tip center for 3D vision coordinate measuring system in portable light pen[J]. Editorial Office of Optics and Precision Engineering, 2013,21(7): 1727-1733
刘书桂董英华姜珍珠. 光笔式视觉测量系统中的测头中心自标定[J]. 光学精密工程, 2013,21(7): 1727-1733 DOI： 10.3788/OPE.20132107.1727.

. Self-calibration of probe tip center for 3D vision coordinate measuring system in portable light pen[J]. Editorial Office of Optics and Precision Engineering, 2013,21(7): 1727-1733 DOI： 10.3788/OPE.20132107.1727.

摘要

考虑光笔式视觉测量系统的测量精度与测头中心位置的准确性相关，本文提出一种基于系统测量模型的测头中心自标定方法。该方法利用每幅光笔图像上的控制点信息，根据位置不变原理建立目标优化函数；利用非线性方程组最小二乘解的广义逆法对目标函数进行优化求解，获得测头中心在光笔坐标系下的位置。最后，借助参考标准锥完成标定，并结合平均思想改善收敛稳定性和速度来实验验证本方法的实用性。实验结果显示，测头中心坐标x、y、z轴的稳定性可分别达到0.033 mm，0.030 mm和0.043 mm

且具有满意的收敛速度。另外，对测量工件圆孔直径与参考值进行比较表明：测头中心标定后，系统的测量精度可满足中等精度的工业测量要求。

Abstract

As the measuring accuracy of a light open 3D vision coordinate measuring system depends on the accurate center position of a probe tip

this paper proposed a novel and simple approach based on the model of measuring system for calibrating the center position of probe tip for the light pen. Based on position invariant principle

the objective function was established according to the control point information of every image. Then

the general inverse method for least square solution of nonlinear multivariable equations was employed to solve the object function and to obtain the center position of probe tip. Finally

average theory was used to improve the stability and convergence speed and to implement the calibration with a reference standard cone. The experimental results demonstrate the effectiveness of the proposed approach. Under a satisfied convergence speed

the repeatability of the system reaches 0.033

0.030 and 0.043 mm in x

y and z axes

respectively. A comparison on the measured circle diameter of a workpiece and a reference shows that the system measurement accuracy has met medium precision industrial measurement requirements with the calibrated probe tip center.

关键词

Keywords

references

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