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Title: Surface profile measurement of low-frequency vibrating objects using temporal analysis of fringe pattern
Authors: Tay, C.J. 
Quan, C. 
Fu, Y. 
Chen, L.J.
Shang, H.M.
Keywords: Dynamic response
Fringe projection
High-speed imaging
Temporal phase analysis
Issue Date: Sep-2004
Source: Tay, C.J., Quan, C., Fu, Y., Chen, L.J., Shang, H.M. (2004-09). Surface profile measurement of low-frequency vibrating objects using temporal analysis of fringe pattern. Optics and Laser Technology 36 (6) : 471-476. ScholarBank@NUS Repository.
Abstract: A simple and accurate algorithm (phase scanning method) is proposed for 3D surface contouring and dynamic response determination of a vibrating object. A sinusoidal fringe pattern is projected onto a low-frequency vibrating object by a programmable liquid crystal display projector. The fringe patterns 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 contour of the specimen at different instants of vibration can be retrieved. In this paper, a small vibrating coin is used to demonstrate the validity of the method and the experimental results are compared with test results on a stationary coin using four-step phase shifting and fast Fourier transform methods. The technique is especially useful in applications where the vibrating object has a complicated shape. © 2003 Elsevier Ltd. All rights reserved.
Source Title: Optics and Laser Technology
ISSN: 00303992
DOI: 10.1016/j.optlastec.2003.12.002
Appears in Collections:Staff Publications

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