Please use this identifier to cite or link to this item:
|Title:||Low-frequency vibration measurement by temporal analysis of projected fringe patterns|
Windowed Fourier analysis
|Citation:||Fu, Y. (2010-02). Low-frequency vibration measurement by temporal analysis of projected fringe patterns. Optics and Lasers in Engineering 48 (2) : 226-234. ScholarBank@NUS Repository. https://doi.org/10.1016/j.optlaseng.2009.03.003|
|Abstract:||Fringe projection is a whole field, non-contacting optical technique allowing direct measurement of surface contour of an object. In many cases, 3D surface profiling is required for vibrating objects or for objects with continuously changing profile, where conventional phase shifting techniques are not applicable. Carrier-based spatial Fourier, window Fourier analyses, or wavelet analysis are normally used to retrieve instantaneous phase maps in dynamic measurement from one fringe pattern, but these techniques require high-quality surface, such as uniform reflectivity, continuity of the surface and a regular shape. Otherwise, large errors will be generated during the process. In this study, a grating is projected on the surface of a low-frequency vibrating object and a sequence of fringe patterns is captured by a high-speed camera. The fringe patterns are processed point-by-point along time axis by different algorithms. To avoid the phase ambiguity problem, a temporal carrier is introduced in the experiment by shifting the grating with a constant speed. The results show that high-quality instantaneous surface profile and the kinematic parameters of vibration, such as displacement, velocity and acceleration can be obtained precisely. © 2009 Elsevier Ltd. All rights reserved.|
|Source Title:||Optics and Lasers in Engineering|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Oct 18, 2018
WEB OF SCIENCETM
checked on Oct 2, 2018
checked on Jun 1, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.