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http://hdl.handle.net/10397/77569
Title: | Fiducial-aided robust positioning of optical freeform surfaces | Authors: | Wang, S Cheung, CF Ren, M Liu, M |
Issue Date: | 2018 | Source: | Micromachines, Feb. 2018, v. 9, no. 2, 52 | Abstract: | Form characterization of a machined optical freeform surface demands accurate alignment of the sampled measured data points on the machined surface, and they are compared with the designed geometry of the surface through positioning. In this paper, a fiducial-aided robust positioning method (FAPM) is developed which attempts to evaluate freeform surfaces with high efficiency and precision. The FAPM method makes use of fiducials as reference datum to form a fiducial-aided computer-aided design (FA-CAD) of the freeform surface which not only establishes an inherent surface feature, but also links the different coordinate systems among design coordinate frame, machine tool, and measurement instrument. To verify the capability of the proposed method, a series of experiments were conducted. Compared with the traditional freeform measurement method (e.g., least squares method), the results indicate that the robustness and accuracy of the measurement is significantly enhanced by the FAPM. | Keywords: | Fiducials Freeform surface Positioning Precision metrology Robustness |
Publisher: | Molecular Diversity Preservation International (MDPI) | Journal: | Micromachines | ISSN: | 2072-666X | EISSN: | 2072-666X | DOI: | 10.3390/mi9020052 | Rights: | © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). The following publication Wang, S.; Cheung, C.F.; Ren, M.; Liu, M. Fiducial-Aided Robust Positioning of Optical Freeform Surfaces. Micromachines 2018, 9, 52, 1-10 is available at https://dx.doi.org/10.3390/mi9020052 |
Appears in Collections: | Journal/Magazine Article |
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Wang_Fiducial-aided_Robust_Positioning.pdf | 4.36 MB | Adobe PDF | View/Open |
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