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Proceedings Paper

Non-uniform interpolation and re-sampling for tactile scanning measurement
Author(s): Xiaojun Liu; Yanghui Hei; Jianjun Wang; Suping Chang
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Paper Abstract

In large range surface measurement by tactile scanning method, nonlinearity problems due to the change of vertical projection height of the stylus and that of the horizontal projection length of the stylus arm are unavoidable during scanning measurement, which will result in nonlinearity of the transducer in vertical direction and also non-uniform sampling interval in horizontal direction, and hence measurement and evaluation error for surface measurement. To solve this problem, current methods are mainly based on modeling and least square fitting, in which a polynomial model with many coefficients to be determined to relate sampling data to practical coordination of measurement points is given, then by least square fitting the coefficients are obtained based on a group of data from a standard sphere measurement, so that the polynomial model is obtained explicitly and sampling data can be compensated for accurate measurement. A problem in this method is the incompleteness of the model, and the standard sphere is a specific standard sphere with given diameter, which doesn’t necessarily include all possible cases with different surface curvatures. In this paper, the nonlinearity mechanism is analyzed, an explicit model based on the mechanism is built, the nonlinearity effect is investigated, and non-uniform interpolation for profile reconstruction and resampling are attempted to improve the analysis and evaluation accuracy. Finally computational and experimental testing are conducted to verify the improvement.

Paper Details

Date Published: 15 November 2011
PDF: 6 pages
Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83212F (15 November 2011); doi: 10.1117/12.905016
Show Author Affiliations
Xiaojun Liu, Huazhong Univ. of Science and Technology (China)
Yanghui Hei, Huazhong Univ. of Science and Technology (China)
Jianjun Wang, Huazhong Univ. of Science and Technology (China)
Suping Chang, Huazhong Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 8321:
Seventh International Symposium on Precision Engineering Measurements and Instrumentation
Kuang-Chao Fan; Man Song; Rong-Sheng Lu, Editor(s)

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