标题: | Corneal surface reconstruction by using heterodyne moire method |
作者: | Chang, Wei-Yao Chen, Kun-Huang Chen, Der-Chin Tseng, Jung-Kai Chen, Shyan-Tarng Sun, Han-Ying Chen, Jing-Heng Hsu, Ken Y. 光電工程學系 Department of Photonics |
关键字: | Corneal surface profile;projection moire;Talbot effect;heterodyne interferometry |
公开日期: | 2013 |
摘要: | In this paper, we propose a simple method for reconstructing the corneal surface profile by using the Talbot effect, projection moire method, and heterodyne interferometry. A linear grating is obliquely illuminated by an expanding collimated light, and a self-image of this grating can be generated and projected on the corneal surface. The deformed grating fringes are imaged on the second grating to form the moire fringes. If the first grating is moved with a constant velocity along the grating plane, a series of sampling points of the sinusoidal wave which behave like the heterodyne interferometric signal can be recorded by a CMOS camera. The phase distribution of the corneal surface then can be obtained with the IEEE 1241 least-square sine fitting algorithm and 2D phase unwrapping. Finally, the corneal surface profile can be reconstructed by substituting the phase distribution into special derived equation. This method provides the advantages of a simple optical setup, ease of operation, high stability, and high resolution. |
URI: | http://hdl.handle.net/11536/24124 http://dx.doi.org/10.1117/12.2020423 |
ISBN: | 978-0-8194-9608-9 |
ISSN: | 0277-786X |
DOI: | 10.1117/12.2020423 |
期刊: | OPTICAL METHODS FOR INSPECTION, CHARACTERIZATION, AND IMAGING OF BIOMATERIALS |
Volume: | 8792 |
显示于类别: | Conferences Paper |
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