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Title: Determination of surface contour by temporal analysis of shadow moiré fringes
Authors: Quan, C. 
Fu, Y. 
Tay, C.J. 
Keywords: High-speed imaging
Shadow moiré
Surface contour
Temporal phase analysis
Issue Date: 15-Jan-2004
Citation: Quan, C., Fu, Y., Tay, C.J. (2004-01-15). Determination of surface contour by temporal analysis of shadow moiré fringes. Optics Communications 230 (1-3) : 23-33. ScholarBank@NUS Repository.
Abstract: A simple temporal analysis algorithm (phase scanning method) is proposed for 3-D surface profile measurement of a vibrating object based on shadow moiré technique. A grating is positioned close to a low-frequency vibrating object and its shadow is observed through the grating. The moiré fringe patterns, generated by the interference of grating lines and shadow lines, are captured by a high-speed CCD camera with a telecentric gauging lens. Phase values are evaluated point by point using phase scanning method. From the phase values of each point on the object, the high-quality surface profile of the specimen at different instants of vibration can be retrieved. In this application, two specimens are tested to demonstrate the validity of the method, one is a spherical cap with height of 4 mm, the other is a small coin with unevenness of less than 0.2 mm. The experimental results are compared with test results using mechanical stylus method. © 2003 Elsevier B.V. All rights reserved.
Source Title: Optics Communications
ISSN: 00304018
DOI: 10.1016/j.optcom.2003.11.035
Appears in Collections:Staff Publications

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