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Proceedings Paper

Data filtering of optical freeform measurement based on a modified 2D cascaded approximating spline filter
Author(s): Qichang Wang; Xiaodong Zhang; Yue Peng; Fengzhou Fang
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Paper Abstract

To achieve a high accuracy of optical freeform surfaces, it is necessary to conduct a repetition of measurementcompensation. Filtering is a key procedure in the loops to extract the actual form errors and then to generate compensation path. Although spline filter is an efficient approach, it has poor robustness when the data contains outliers. A modified spline filter is introduced in this study to enhance the robustness by a preprocessing procedure based on the M-estimation theory. The cascaded approximating method is also applied to reduce the deviation to Gaussian filter in the amplitude transmission characteristic. The 2D spline filter is also developed to process the 3D measured data of optical freeform surfaces. The effectiveness of this newly proposed method is verified by the experiments.

Paper Details

Date Published: 16 October 2012
PDF: 6 pages
Proc. SPIE 8416, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 84160J (16 October 2012); doi: 10.1117/12.978166
Show Author Affiliations
Qichang Wang, Tianjin Univ. (China)
Xiaodong Zhang, Tianjin Univ. (China)
Yue Peng, Tianjin Univ. (China)
Fengzhou Fang, Tianjin Univ. (China)


Published in SPIE Proceedings Vol. 8416:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Li Yang; Eric Ruch; Shengyi Li, Editor(s)

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