標題: Heterodyne moire interferometry for measuring corneal surface profile
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
關鍵字: Corneal surface profile;Heterodyne interferometry;Projection moire;Talbot effect
公開日期: 1-三月-2014
摘要: This study proposes an accurate method for reconstructing the corneal surface profile. By applying a constant velocity to the projection grating along the grating plane, a series of sampling points of the sinusoidal wave, which behaves in the manner of heterodyne interferometric signals, can be recorded using a CMOS camera. The phase distribution of the moire fringes can then be obtained using the IEEE 1241 least-square sine fitting algorithm and two-dimensional (2D) phase unwrapping. Finally, the corneal surface profile can be reconstructed by substituting the phase distribution into a specially derived equation. To validate the proposed method, the corneal surface of a pig eyeball was measured. The measurement resolution was approximately 3.5 mu m. Because of the introduction of the Talbot effect, the projection moire method, and heterodyne interferometry, this approach provides the advantages of a simple optical setup, ease of operation, high stability, and high resolution. (C) 2013 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.optlaseng.2013.07.013
http://hdl.handle.net/11536/23366
ISSN: 0143-8166
DOI: 10.1016/j.optlaseng.2013.07.013
期刊: OPTICS AND LASERS IN ENGINEERING
Volume: 54
Issue: 
起始頁: 232
結束頁: 235
顯示於類別:期刊論文


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