A self-calibration rotational stitching method for precision measurement of revolving surfaces

被引:5
|
作者
Liu, M. Y. [1 ]
Cheung, C. F. [1 ]
Feng, X. [2 ]
Wang, C. J. [1 ]
Leach, R. K. [2 ]
机构
[1] Hong Kong Polytech Univ, Dept Ind & Syst Engn, Partner State Key Lab Ultraprecis Machining Techn, Hong Kong, Peoples R China
[2] Univ Nottingham, Fac Engn, Mfg Metrol Team, Nottingham NG8 1BB, England
基金
英国工程与自然科学研究理事会; 中国国家自然科学基金;
关键词
Rotational stitching; Revolving surfaces; Precision measurement; Self-calibration; Ultra-precision machining; INTERFEROMETRY; REGISTRATION; FORM;
D O I
10.1016/j.precisioneng.2018.05.002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
When measuring revolving objects, it is often desired to obtain not only the geometrical form of the workpiece, but also the topography of the surface, as they both affect the performance of the part. However, holistic measurement of the entire three-dimensional surface of a revolving part is challenging since most surface measurement instruments only have limited measurement ability, where the bottom and the side surfaces cannot be measured. One solution to obtain geometrical form and surface topography information simultaneously is to add a precision axis to rotate the object while performing surface topography measurement. However, this solution requires a high-cost precision rotation stage and adjustable mounting and alignment aids. Moreover, errors in the rotation will be added to the measurement result, which can be difficult to compensate. Stitching is a method often used for measuring revolving surfaces without the need for precision motion axes, as the method is applied at the software level, and errors in the rotation can be compensated by the stitching algorithm. Nevertheless, the overall accuracy of stitching is limited when the number of sub-surfaces is large, since the measurement and stitching error accumulate along the stitching chain. In this paper, a self-calibration rotational stitching method is presented which can compensate for the accumulated error. The self-calibration method utilises the inherent nature of a revolving surface and compensates for the registration error by aligning the last dataset with the first dataset. The proposed method is demonstrated by measuring grinding wheels with a coherence scanning interferometer and simultaneously rotating the grinding wheels with a low-cost stepper-motor. It is demonstrated that the proposed stitching measurement method is effective in compensating for accumulated registration error. The proposed self-calibration rotational stitching method can be easily extended to a wide range of applications for measuring revolving surfaces using various measuring instruments.
引用
收藏
页码:60 / 69
页数:10
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