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Proceedings Paper

The study of optimization on process parameters of high-accuracy computerized numerical control polishing
Author(s): Wei-Ren Huang; Shih-Pu Huang; Tsung-Yueh Tsai; Yi-Jyun Lin; Zong-Ru Yu; Ching-Hsiang Kuo; Wei-Yao Hsu; Hong-Tsu Young
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Paper Abstract

Spherical lenses lead to forming spherical aberration and reduced optical performance. Consequently, in practice optical system shall apply a combination of spherical lenses for aberration correction. Thus, the volume of the optical system increased. In modern optical systems, aspherical lenses have been widely used because of their high optical performance with less optical components. However, aspherical surfaces cannot be fabricated by traditional full aperture polishing process due to their varying curvature. Sub-aperture computer numerical control (CNC) polishing is adopted for aspherical surface fabrication in recent years. By using CNC polishing process, mid-spatial frequency (MSF) error is normally accompanied during this process. And the MSF surface texture of optics decreases the optical performance for high precision optical system, especially for short-wavelength applications. Based on a bonnet polishing CNC machine, this study focuses on the relationship between MSF surface texture and CNC polishing parameters, which include feed rate, head speed, track spacing and path direction. The power spectral density (PSD) analysis is used to judge the MSF level caused by those polishing parameters. The test results show that controlling the removal depth of single polishing path, through the feed rate, and without same direction polishing path for higher total removal depth can efficiently reduce the MSF error. To verify the optical polishing parameters, we divided a correction polishing process to several polishing runs with different direction polishing paths. Compare to one shot polishing run, multi-direction path polishing plan could produce better surface quality on the optics.

Paper Details

Date Published: 5 September 2017
PDF: 6 pages
Proc. SPIE 10401, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems, 104011B (5 September 2017); doi: 10.1117/12.2272529
Show Author Affiliations
Wei-Ren Huang, National Taiwan Univ. (Taiwan)
Shih-Pu Huang, National Taiwan Univ. (Taiwan)
Tsung-Yueh Tsai, National Taiwan Univ. (Taiwan)
Yi-Jyun Lin, National Taiwan Univ. (Taiwan)
Zong-Ru Yu, Instrument Technology Research Ctr. (Taiwan)
Ching-Hsiang Kuo, Instrument Technology Research Ctr. (Taiwan)
Wei-Yao Hsu, Instrument Technology Research Ctr. (Taiwan)
Hong-Tsu Young, National Taiwan Univ. (Taiwan)


Published in SPIE Proceedings Vol. 10401:
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems
Tony B. Hull; Dae Wook Kim; Pascal Hallibert, Editor(s)

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