The measurement techniques for angular 3-D pinholes based on capacitive probe

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• 作者：Yu-zhen Ma^a ; ^{me_mayz@ujn.edu.cn} ; Ling Ma^b ; Yi-zhong Zheng^b
• 关键词：Angular 3-D pinholes ; Capacitive probe ; Three-dimensional coordinates ; Axis ; Fitting algorithm ; Circular workpiece
• 刊名：Measurement
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：97
• 期：Complete
• 页码：145-148
• 全文大小：636 K
• 卷排序：97

文摘

Based on the measurement progress of straight through pinholes, the measuring for angular is challenging because the probe is inconvenient to stretch into the pinhole exactly. In the paper, an adjustable five-dimensional system, which is mainly composed of a three-coordinate measuring machine (CMM), a turntable, a visual sensor and a capacitive probe, is employed to accomplish the measurement for a circular workpiece with angular multi-pinholes. The CMM traces the coordinates while the capacitive probe moves, a precise turntable turns the workpiece at desired angle to guarantee the pinhole and the probe in the same orientation. A binocular visual sensor and a capacitive probe is for alignment and measuring, respectively. A comprehensive algorithm of combining projection and the least-squares fitting is put forward for fitting spatial axis equation of 3-D pinholes. Finally, a reliable and entire measurement system is set up and the optimal equation of the spatial axis is obtained.