Low-frequency vibration measurement by temporal analysis of projected fringe patterns

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...

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Main Author: Fu, Yu
Other Authors: Temasek Laboratories
Format: Article
Language:English
Published: 2011
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Online Access:https://hdl.handle.net/10356/91118
http://hdl.handle.net/10220/6699
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-911182020-09-26T22:17:01Z Low-frequency vibration measurement by temporal analysis of projected fringe patterns Fu, Yu Temasek Laboratories DRNTU::Science::Physics::Optics and light 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. Accepted version 2011-01-25T01:19:12Z 2019-12-06T18:00:05Z 2011-01-25T01:19:12Z 2019-12-06T18:00:05Z 2010 2010 Journal Article Fu, Y. (2010). Low-frequency vibration measurement by temporal analysis of projected fringe patterns. Optics and Lasers in Engineering, 48(2), 226-234. 0143-8166 https://hdl.handle.net/10356/91118 http://hdl.handle.net/10220/6699 10.1016/j.optlaseng.2009.03.003 en Optics and lasers in engineering This is the author created version of a work that has been peer reviewed and accepted for publication by Optics and Lasers in Engineering, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI:http//dx.doi.org/10.1016/j.optlaseng.2009.03.003] 28 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Science::Physics::Optics and light
spellingShingle DRNTU::Science::Physics::Optics and light
Fu, Yu
Low-frequency vibration measurement by temporal analysis of projected fringe patterns
description 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.
author2 Temasek Laboratories
author_facet Temasek Laboratories
Fu, Yu
format Article
author Fu, Yu
author_sort Fu, Yu
title Low-frequency vibration measurement by temporal analysis of projected fringe patterns
title_short Low-frequency vibration measurement by temporal analysis of projected fringe patterns
title_full Low-frequency vibration measurement by temporal analysis of projected fringe patterns
title_fullStr Low-frequency vibration measurement by temporal analysis of projected fringe patterns
title_full_unstemmed Low-frequency vibration measurement by temporal analysis of projected fringe patterns
title_sort low-frequency vibration measurement by temporal analysis of projected fringe patterns
publishDate 2011
url https://hdl.handle.net/10356/91118
http://hdl.handle.net/10220/6699
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