Please use this identifier to cite or link to this item:
https://hdl.handle.net/10356/92039
Title: | Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis | Authors: | Tay, Cho Jui Quan, Chenggen Fu, Yu Huang, Yuanhao |
Keywords: | DRNTU::Science::Physics::Optics and light | Issue Date: | 2004 | Source: | Tay, C. J., Quan, C. G., Fu, Y., & Huang, Y. H. (2004). Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis. Applied Optics, 43(21), 4164-4171. | Series/Report no.: | Applied Optics | Abstract: | A temporal wavelet analysis method is proposed for velocity, displacement, and three-dimensional surface-profile measurement of a continuously deforming object by use of the shadow moire´ technique. A grating is placed close to a deforming object, and its shadow is observed through the grating. The moire´ fringe patterns, generated by the interference of the grating lines and their shadows, are captured by a high-speed CCD camera with a telecentric gauging lens. Instantaneous frequency of gray-value variation is evaluated point by point with the continuous wavelet transform. From the instantaneous frequency of each point on the object, the velocity, displacement, and high-quality surface profile at different instants can be retrieved. In this application, two specimens are tested to demonstrate the validity of the proposed method: One is a small coin with a rigid body motion, and the other is a simply supported beam subjected to a central point load. The results are compared with those obtained from temporal Fourier-transform and mechanical stylus methods. | URI: | https://hdl.handle.net/10356/92039 http://hdl.handle.net/10220/6472 |
ISSN: | 0003-6935 | DOI: | 10.1364/AO.43.004164 | Research Centres: | Temasek Laboratories | Rights: | This paper was published in [Applied Optics] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: [http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-43-21-4164]. Systematic or multiple reproduction or distribution to multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
Appears in Collections: | TL Journal Articles |
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Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis.pdf | 1.85 MB | Adobe PDF | View/Open |
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