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Proceedings Paper

White-light interferometric measurement of spherical and aspherical surfaces
Author(s): Suping Chang; Tiebang Xie
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Paper Abstract

White-light interferometric techniques and image processing techniques have been widely applied in measurement of surface profiles. A new method based on two technologies to achieve the optical non-contact shape measurement for spherical and aspherical surfaces is presented in this paper. This method utilizes the pixels of the image to locate the points of surface and obtains the surface height information by a vertical scanning white-light interferometric system. A set of a three-dimensional stage composed of a fine and coarse two-step vertical driver, and a two-dimensional horizontal driver is designed to enlarge the measurement area and the vertical scanning range. The measurement precision depends on the the performance of the interference microscope and the three-dimensional stage, so the influence of the interference microscope on the measurement result and the precision of the stage are analyzed. In the stage, a grating sensor is used to monitor the scanning process and the scanning information is fed to driving circuit to compensate for the errors. Additionally, experiments are carried out and correlative results are also shown.

Paper Details

Date Published: 13 October 2006
PDF: 6 pages
Proc. SPIE 6280, Third International Symposium on Precision Mechanical Measurements, 62800W (13 October 2006); doi: 10.1117/12.716114
Show Author Affiliations
Suping Chang, Huazhong Univ. of Science and Technology (China)
Tiebang Xie, Huazhong Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 6280:
Third International Symposium on Precision Mechanical Measurements
Kuang-Chao Fan; Wei Gao; Xiaofen Yu; Wenhao Huang; Penghao Hu, Editor(s)

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